CA2428381C - Lightguide coupling - Google Patents
Lightguide coupling Download PDFInfo
- Publication number
- CA2428381C CA2428381C CA002428381A CA2428381A CA2428381C CA 2428381 C CA2428381 C CA 2428381C CA 002428381 A CA002428381 A CA 002428381A CA 2428381 A CA2428381 A CA 2428381A CA 2428381 C CA2428381 C CA 2428381C
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- CA
- Canada
- Prior art keywords
- coupling body
- intermediate coupling
- screws
- flange
- adjustment screws
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
- G02B6/327—Optical coupling means having lens focusing means positioned between opposed fibre ends with angled interfaces to reduce reflections
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
- G02B6/422—Active alignment, i.e. moving the elements in response to the detected degree of coupling or position of the elements
- G02B6/4226—Positioning means for moving the elements into alignment, e.g. alignment screws, deformation of the mount
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
Abstract
The device (V) serves the optical coupling of an arriving light beam (L) from any optical component, with a further-transmitting light-guiding fibre (F). It contains in each case an input--side and output-side coupling body (1,2) with in each case a centric lead-through (13, 22) for leading through the light (L), wherein in the device (V) there is arranged at least one lens (40) or a lens system. Between the input-side (1) and the output-side coupling body (2) there is arranged an intermediate coupling body (3) with a centric lead-through (34), which in one of the input--side or output-side coupling bodies (1,2) is displaceably and lockably held in a plane, whilst the other input-side or output-side coupling bodies (1,2) in the intermediate coupling body (3) is mounted in an elastically (25) pivotally movable and axially displaceable manner. The device (V) permits a separate angular adjustment or parallel displacement of the input-side and output--side coupling bodies (1, 2) relative to one another.
Description
Lightguide coupling The present invention relates to a device for the optical coupling of an arriving light beam from any optical component, with a further-transmitting, light-guiding fibre.
The transmission of information and energy by way of light, which is transmitted via fibreglass guides, has been known for more than 30 years. The transmission by way of a complete fibre bundle is effected usually only over very short distances, whereas infonnation may be led over large distances via a single glass-fibre line. At the same time several coupling locations occur, specifically on the one hand for supplying the light beam into the fibre and on the other hand at various connection locations at which a coupling from fibre to fibre is effected.
Each coupling of course entails a certain loss of energy. The best possible coupling between two fibres is achieved in that the ends of both fibres are polished into smooth surfaces and are pressed onto one another in a planar manner. This type of connection demands a highly accurate equipping and is only suitable for permanent connections.
For the releasable coupling of a light transmission a collimated light beam is fed into a further-transmitting light fibre by way of a focussing lens or a focussing lens system. For a transmission at the coupling location which is as loss-free as possible one must ensure that a highly exact axially flush alignment of the arriving light beam with the lightguide transmitting the light further is possible. This may be achieved in the most varied of manners. From US-A-4'087'155 there is for example known a plug connection for this in which a fibre-to-fibre coupling is realised in which the fibres to be coupled may be directly led exactly to one another without optical lens systems. Each individual fibre at the same time rests between at least three elastically mounted spherical balls which may be slightly displaced on coupling.
US-A-4'296'999 shows a completely different solution. Here two coupling bodies are connected to one another as exactly and rigidly as possible, wherein one assumes that as a result practically no axial displacement from the centred position occurs. Each fibre of this connection is in each case connected to a lens or to a lens system, and the lenses or lens systems may be moved to one another or away from one another in the axial direction (z-direction), for the purpose of focussing.
The document EP-B-O'198'657 is particularly fundamental, in which there are described and illustrated devices for optical coupling between the light source and the light-guiding fibre as well as couplings between two light-guiding fibres. At the same time there are disclosed two basic principles. In one case at least one lightguide with a focussing lens is held in a sleeve, and this sleeve is held in a coupling tube with the intermediate arrangement of rubber-elastic, flexible I
tubing pushed over the sleeve. By way of screws acting radially on the sleeve, this may be displaced in the radial directions (x- and y-direction), by which means one may set an angular alignment to the second, fixedly arranged lightguide arrangement. A focussing adjustment in the z-direction is not envisaged, but with regard to design is taken to be given.
In a second solution the coupling bodies are configured as a flange. By way of peripherally amanged screws with a different pitch the two flanges on the one hand may be moved to one another in the z-direction and may be adjusted in a desired angular position in the x- and y-direction.
Devices for tilting or axially (in the z-direction) displacing an optical element with respect to a plain base surface are well-known. Such devices comprise a three- or more-point bearing for adjustment screws and one or more springs for exercising an elastic force between the optical element and the base surface. This principle is applied, e.g., by the kit disclosed in DE-B-21'58'588, by the goniometer disclosed in DE-B-91 1'549 and by the fibre coupler disclosed in US-A-4'641'915.
Even though the known coupling devices could carry out all required movements, the adjustment however was still very time-consuming and required suitable experience. This lies in the fact that with the known solutions the angular adjustment as well as the parallel displacement within the xy-plane is to be effected by way of the same screws. Thus with the state of the art it was unavoidable that also a slight shifting was effected with the angular adjustment. As a result, this slight displacement out of the axis has often been accepted in order to avoid a renewed adjustment, possibly again with the adjustment of the angular position.
It is therefore the object of the present inventioin to provide a device with which the angular position adjustment and the parallel displacement of coupling bodies on the input and output sides relative to one another may be carried out separately.
According to an aspect of the invention there is provided a device for optically coupling an arriving light beam with a further-transmitting light-guiding fiber, the device comprising:
(a) a first and a second coupling body, each of said first and second coupling bodies having a centric lead-through for leading through the light beam; and (b) an intermediate coupling body positioned between said first and second coupling bodies and having a centric lead-through for leading through the light beam, wherein the intermediate coupling body is displaceably and lockably held in one plane within the first coupling body, and the second coupling body is mounted in a pivotally and axially displaceable movable manner in the intermediate coupling body, and wherein the first coupling body comprises a planar flange which runs perpendicular to the centric lead-through and is surrounded by a circumferential collar, the circumferential collar being passed through by at least one first adjustment screws and at least one first locking screw, which act on the intermediate coupling body.
Further advantageous embodiment forms of the subject-matter of the invention are to be deduced from the dependent claims, and their significance is explained in the subsequent description with reference to the accompanying drawings.
There are shown in:
Figure 1 a vertical section through a device according to the invention, wherein on the input side a light beam arriving from a laser apparatus is fed into a lightguide fibre on the output side.
2a Figure 4 shows a vertical section through a third embodiment form of a device for coupling two lightguide fibres, and Figure 4 shows a view of the side of the coupling device according to the invention on the output side, according to one of the Figures 1-3.
Figure 5 shows a vertical section through a fourth embodiment form of a coupling device according to the invention, with which the angular adjustment is effected by way of radially directed screws.
Figures 6 shows a vertical section through a fifth embodiment form of a coupling device according to the invention, and Figure 7 shows a plan view of the central part of the output side of the coupling device according to Figure 6.
The entire device according to the invention, for optically coupling an arriving light beam from any optical component to a further-transmitting, light-guiding fibre F is indicated here at V.
The optical coupling device V, whose first embodiment example is shown in Figure 1, has three main components. There are an input-side coupling body 1, an output-side coupling body 2 and a coupling body arranged between these, which is indicated as an intennediate coupling body 3.
Since the terms "output-side coupling body" and- "input-side coupling body"
may always be interchanged, hereinafter in the description one mostly only speaks of coupling bodies if one of these two elements is meant, whilst the element lying therebetween is always indicated as an "intermediate coupling body". The input-side coupling body 1 in its shape is practically only dependent on how the optical components on the input side look. The light source, in particular a laser apparatus, a beam splitter or an input-side lightguide fibre are considered as optical components.
The input-side coupling body I has a tube piece 10 with a terminal flange 11 on whose periphery there is integrally formed a circumferential collar 12. The tube piece 10 simultaneously forms the centric lead-through 13 of the input-side coupling body 1. The surface of the flange 11 delimited by the collar 12 is designed a planar surface 14. This planar surface 15 is manufactured in a highly precise manner and serves as a sliding surface for the intermediate coupling body 3 lying thereon. In the collar 12 there are arranged several, preferably four threaded bores 15 which are distributed uniformly over the circumference and are directed towards the centre. The four threaded bores 15 serve for acconunodating two first adjusting screws 17 or two threaded spring pins 19. A fifth threaded bore 16 which is arranged centrally between two neighbouring threaded bores 15 serves for accommodating a first locking screw 18.
The transmission of information and energy by way of light, which is transmitted via fibreglass guides, has been known for more than 30 years. The transmission by way of a complete fibre bundle is effected usually only over very short distances, whereas infonnation may be led over large distances via a single glass-fibre line. At the same time several coupling locations occur, specifically on the one hand for supplying the light beam into the fibre and on the other hand at various connection locations at which a coupling from fibre to fibre is effected.
Each coupling of course entails a certain loss of energy. The best possible coupling between two fibres is achieved in that the ends of both fibres are polished into smooth surfaces and are pressed onto one another in a planar manner. This type of connection demands a highly accurate equipping and is only suitable for permanent connections.
For the releasable coupling of a light transmission a collimated light beam is fed into a further-transmitting light fibre by way of a focussing lens or a focussing lens system. For a transmission at the coupling location which is as loss-free as possible one must ensure that a highly exact axially flush alignment of the arriving light beam with the lightguide transmitting the light further is possible. This may be achieved in the most varied of manners. From US-A-4'087'155 there is for example known a plug connection for this in which a fibre-to-fibre coupling is realised in which the fibres to be coupled may be directly led exactly to one another without optical lens systems. Each individual fibre at the same time rests between at least three elastically mounted spherical balls which may be slightly displaced on coupling.
US-A-4'296'999 shows a completely different solution. Here two coupling bodies are connected to one another as exactly and rigidly as possible, wherein one assumes that as a result practically no axial displacement from the centred position occurs. Each fibre of this connection is in each case connected to a lens or to a lens system, and the lenses or lens systems may be moved to one another or away from one another in the axial direction (z-direction), for the purpose of focussing.
The document EP-B-O'198'657 is particularly fundamental, in which there are described and illustrated devices for optical coupling between the light source and the light-guiding fibre as well as couplings between two light-guiding fibres. At the same time there are disclosed two basic principles. In one case at least one lightguide with a focussing lens is held in a sleeve, and this sleeve is held in a coupling tube with the intermediate arrangement of rubber-elastic, flexible I
tubing pushed over the sleeve. By way of screws acting radially on the sleeve, this may be displaced in the radial directions (x- and y-direction), by which means one may set an angular alignment to the second, fixedly arranged lightguide arrangement. A focussing adjustment in the z-direction is not envisaged, but with regard to design is taken to be given.
In a second solution the coupling bodies are configured as a flange. By way of peripherally amanged screws with a different pitch the two flanges on the one hand may be moved to one another in the z-direction and may be adjusted in a desired angular position in the x- and y-direction.
Devices for tilting or axially (in the z-direction) displacing an optical element with respect to a plain base surface are well-known. Such devices comprise a three- or more-point bearing for adjustment screws and one or more springs for exercising an elastic force between the optical element and the base surface. This principle is applied, e.g., by the kit disclosed in DE-B-21'58'588, by the goniometer disclosed in DE-B-91 1'549 and by the fibre coupler disclosed in US-A-4'641'915.
Even though the known coupling devices could carry out all required movements, the adjustment however was still very time-consuming and required suitable experience. This lies in the fact that with the known solutions the angular adjustment as well as the parallel displacement within the xy-plane is to be effected by way of the same screws. Thus with the state of the art it was unavoidable that also a slight shifting was effected with the angular adjustment. As a result, this slight displacement out of the axis has often been accepted in order to avoid a renewed adjustment, possibly again with the adjustment of the angular position.
It is therefore the object of the present inventioin to provide a device with which the angular position adjustment and the parallel displacement of coupling bodies on the input and output sides relative to one another may be carried out separately.
According to an aspect of the invention there is provided a device for optically coupling an arriving light beam with a further-transmitting light-guiding fiber, the device comprising:
(a) a first and a second coupling body, each of said first and second coupling bodies having a centric lead-through for leading through the light beam; and (b) an intermediate coupling body positioned between said first and second coupling bodies and having a centric lead-through for leading through the light beam, wherein the intermediate coupling body is displaceably and lockably held in one plane within the first coupling body, and the second coupling body is mounted in a pivotally and axially displaceable movable manner in the intermediate coupling body, and wherein the first coupling body comprises a planar flange which runs perpendicular to the centric lead-through and is surrounded by a circumferential collar, the circumferential collar being passed through by at least one first adjustment screws and at least one first locking screw, which act on the intermediate coupling body.
Further advantageous embodiment forms of the subject-matter of the invention are to be deduced from the dependent claims, and their significance is explained in the subsequent description with reference to the accompanying drawings.
There are shown in:
Figure 1 a vertical section through a device according to the invention, wherein on the input side a light beam arriving from a laser apparatus is fed into a lightguide fibre on the output side.
2a Figure 4 shows a vertical section through a third embodiment form of a device for coupling two lightguide fibres, and Figure 4 shows a view of the side of the coupling device according to the invention on the output side, according to one of the Figures 1-3.
Figure 5 shows a vertical section through a fourth embodiment form of a coupling device according to the invention, with which the angular adjustment is effected by way of radially directed screws.
Figures 6 shows a vertical section through a fifth embodiment form of a coupling device according to the invention, and Figure 7 shows a plan view of the central part of the output side of the coupling device according to Figure 6.
The entire device according to the invention, for optically coupling an arriving light beam from any optical component to a further-transmitting, light-guiding fibre F is indicated here at V.
The optical coupling device V, whose first embodiment example is shown in Figure 1, has three main components. There are an input-side coupling body 1, an output-side coupling body 2 and a coupling body arranged between these, which is indicated as an intennediate coupling body 3.
Since the terms "output-side coupling body" and- "input-side coupling body"
may always be interchanged, hereinafter in the description one mostly only speaks of coupling bodies if one of these two elements is meant, whilst the element lying therebetween is always indicated as an "intermediate coupling body". The input-side coupling body 1 in its shape is practically only dependent on how the optical components on the input side look. The light source, in particular a laser apparatus, a beam splitter or an input-side lightguide fibre are considered as optical components.
The input-side coupling body I has a tube piece 10 with a terminal flange 11 on whose periphery there is integrally formed a circumferential collar 12. The tube piece 10 simultaneously forms the centric lead-through 13 of the input-side coupling body 1. The surface of the flange 11 delimited by the collar 12 is designed a planar surface 14. This planar surface 15 is manufactured in a highly precise manner and serves as a sliding surface for the intermediate coupling body 3 lying thereon. In the collar 12 there are arranged several, preferably four threaded bores 15 which are distributed uniformly over the circumference and are directed towards the centre. The four threaded bores 15 serve for acconunodating two first adjusting screws 17 or two threaded spring pins 19. A fifth threaded bore 16 which is arranged centrally between two neighbouring threaded bores 15 serves for accommodating a first locking screw 18.
The intermediate coupling body 3 is displaceably arranged lying on the planar surface 14.
This intermediate coupling body 3 has the shape of a truncated cone. At the same time it may be the case of a cylindrical truncated cone or a truncated cone with a polygonal base surface. In order to prevent a twisting of the truncated cone 3 on the planar surface 14, one would preferably grind chamfers 32 on its superficies 31 on which the corresponding first adjustment screws 17, first locking screws 18 or threaded spring pins 19 bear. This is most evident from Figure 4.
The two first adjusting screws 17 are perpendicular to one another so that the one first adjustment screw effects a displacement in the x-axis direction and the other first adjustment screw in the y-axis direction. Arranged diametrically opposite each first adjustment screw is a threaded spring pin 19, wherein the first adjustment screws 17 as well as the threaded spring pins 19 are held in threaded bores 15 which pass through the collar 12 in the direction of the centre axis. A first locking screw 18 is arranged between the two threaded spring pins 19, which likewise is directed towards the centre axis.
The threaded spring pins 19 may also be replaced by other elements, which have the object of producing a repelling force component between the collar 12 and the intermediate coupling body 3 and thus to press the intermediate coupling body 3 onto the first adjusting screws 17. An alternative to the threaded spring pins 19 would e.g. be an elastic mass incorporated in the volume between the collar 12 and the intennediate coupling body 3. Instead of the threaded spring pins 19 however further screws may be applied. This alternative variant thus encompasses three or more screws which are screwed into the threaded bores 15 of the collar and rigidly hold the intermediate coupling body. With this there is no need to differentiate between the adjustment and locking screws. Thanks to the inclined superficies or the inclined ground chamfers 23 the first adjustment screws 17, the first locking screws 18 and the threaded spring pins 19 exert a force component onto the truncated cone 30 which effects the pressing force of the truncated cone 30 onto the planar surface 14. This pressing force may be set practically infinitely by the inclination of the threaded bores 15.
A pocket hole bore 33 is centrically formed in the truncated cone 30 from the upper, smaller surface. In its centre there is provided a centric lead-through 34, preferably also as a cylindrical bore. Centrally mounted, the output-side coupling body 2 engages in this centric pocket hole bore 33. This coupling body also consists of a tube piece 21 which terminates at a terminal flange 23. The tube piece 21 and the terminal flange 23 have a centric lead-through 22.
The centric lead-through 22 may comprise an inner thread 24 in which a lens 40 in a lens carrier 40 may be displaced to a greater or lesser extent in the direction of the z-axis by way of screwing.
This intermediate coupling body 3 has the shape of a truncated cone. At the same time it may be the case of a cylindrical truncated cone or a truncated cone with a polygonal base surface. In order to prevent a twisting of the truncated cone 3 on the planar surface 14, one would preferably grind chamfers 32 on its superficies 31 on which the corresponding first adjustment screws 17, first locking screws 18 or threaded spring pins 19 bear. This is most evident from Figure 4.
The two first adjusting screws 17 are perpendicular to one another so that the one first adjustment screw effects a displacement in the x-axis direction and the other first adjustment screw in the y-axis direction. Arranged diametrically opposite each first adjustment screw is a threaded spring pin 19, wherein the first adjustment screws 17 as well as the threaded spring pins 19 are held in threaded bores 15 which pass through the collar 12 in the direction of the centre axis. A first locking screw 18 is arranged between the two threaded spring pins 19, which likewise is directed towards the centre axis.
The threaded spring pins 19 may also be replaced by other elements, which have the object of producing a repelling force component between the collar 12 and the intermediate coupling body 3 and thus to press the intermediate coupling body 3 onto the first adjusting screws 17. An alternative to the threaded spring pins 19 would e.g. be an elastic mass incorporated in the volume between the collar 12 and the intennediate coupling body 3. Instead of the threaded spring pins 19 however further screws may be applied. This alternative variant thus encompasses three or more screws which are screwed into the threaded bores 15 of the collar and rigidly hold the intermediate coupling body. With this there is no need to differentiate between the adjustment and locking screws. Thanks to the inclined superficies or the inclined ground chamfers 23 the first adjustment screws 17, the first locking screws 18 and the threaded spring pins 19 exert a force component onto the truncated cone 30 which effects the pressing force of the truncated cone 30 onto the planar surface 14. This pressing force may be set practically infinitely by the inclination of the threaded bores 15.
A pocket hole bore 33 is centrically formed in the truncated cone 30 from the upper, smaller surface. In its centre there is provided a centric lead-through 34, preferably also as a cylindrical bore. Centrally mounted, the output-side coupling body 2 engages in this centric pocket hole bore 33. This coupling body also consists of a tube piece 21 which terminates at a terminal flange 23. The tube piece 21 and the terminal flange 23 have a centric lead-through 22.
The centric lead-through 22 may comprise an inner thread 24 in which a lens 40 in a lens carrier 40 may be displaced to a greater or lesser extent in the direction of the z-axis by way of screwing.
Between the circumferential inner wall of the pocket hole bore 33 and the tube piece 21 there is arranged an elastic cylinder section 25. This elastic cylinder section 25 may either be designed as a rubber-elastic flexible tubing section, or the inner wall of the pocket hole bore may be coated with a rubber layer which is vulcanised on. The elastic cylinder section 25 permits a slight tilting of output-side coupling body 2 with respect to the intermediate coupling body 3 and thus also with respect to the input-side coupling body 1. Of course the elastic cylinder section 25 may also be replaced by other suitable elastic means, for example by way of a plurality of elastic elements which are distributed along the inner wall of the pocket hole bore 33.
For adjusting the angular position of the output-side coupling body 2 to the input-side coupling body 1, in the flange 23 of the output-side coupling body 2 there are alternatingly incorporated passage holes 26 and threaded holes 27. Second locking screws 29 may be led through the passage holes 26, which engage into threaded pocket holes 35.
Through the threaded holes 27 in the flange 23 there are applied second adjustment screws 28 which in the intermediate coupling body 3 are supported in corresponding pocket holes 36.
The threadless passage holes 26 and pocket holes 36 need to be sufficiently wide in order to permit a certain tilting movement of the screws. The tilting movement which is to be carried out is usually very small and is between 0 and a few degrees.
As is shown in a second embodiment example illustrated in Figure 2, a lens 40 in a lens carrier 41 may also be arranged in the central lead-through 34 of the intermediate coupling body 3 in a manner displaceable by screw. The lightguide F is provided with a commercially available end piece E which is fixedly or releasably connected to the output-side coupling body 2.
In Figure 3 there is shown a similar third embodiment form practically analogously to the Figures 1 and 2, wherein the input-side coupling body I has a thick-walled tube piece 10 whose input-side opening is provided with an end-piece in which a lightguide fibre F
is held. The solution shown here thus shows a fibre-to fibre connection. With this one would attach a collimating lens or a collimating lens system 40 in the input-side coupling body 1, and in the oppositely lying tube piece 21 of the output-side coupling body 2 a focussing lens 40 or a focussing lens system. Otherwise in its construction this embodiment form is the same as the solutions according to Figures 1 and 2.
In Figure 5 there is shown a fourth embodiment form with which the intermediate coupling body 3 on the upper cover surface comprises a cylindrical extension 37 which is connected to this. This cylindrical extension 37 is connected to the intermediate coupling body 3 as one piece. This allows the possibility of screwing two adjustment screws 28 and two locking screws 29 radially through this cylindrical extension piece 37 which then act on the tube piece 21 of the output-side coupling body 2. The output-side coupling body 2 in this case requires no terminal flange 23. This solution is accordingly economical. The second adjustment screws 28 and the second locking screws 29 may lie in one plane which most preferably intersects the cylindrical extension 37 perpendicularly. In order to give the device an even greater stability, further (non-drawn) second adjustment and locking screws may be attached which are axially distanced to the second adjustment and locking screws 28, 29 drawn in Figure 5. The second adjustment and locking screws 28, 29 should be arranged sufficiently distanced from the elastic cylinder section 25 in order to be able to carry out an optimal tilting movement. With the embodiment form shown in Fig. 5 again the arriving light beam L may be led into the lightguide fibre F in an exact alignment in that the parallel displacement and the tilting movement may be carried out independently of one another.
A further, fifth embodiment fonn of the device according to the invention is shown in the vertical section in Figure 6 and in a part plan view in Figure 7. The output-side coupling body 2 is configured here as a disk with a centric passage bore 22 or as a ring. It is adjustable or lockable with respect to the intermediate coupling body 3 by way of two adjustment screws 38 and two locking screws 39.
For adjusting the angular position of the output-side coupling body 2 there are provided second adjustment screws 38. The second adjustment screws 38 are screwed into con:esponding threaded bores 27 in the annular output-side coupling body 2 and are supported on that surface of the intermediate coupling body 3 which faces the output-side coupling body 2.
In order to avoid an over-definition one preferably operates with only three second adjustment screws 38. One advantageously distributes these uniformly over the circumference.
The second Iocking screws 39 in passage bores 26 pass through the annular output-side coupling body 2 and engage into threaded pocket holes 35 in the intermediate coupling body 3.
The second locking screws 39 are supported by way of spring elements 42 on the outer side of the output-side coupling body 2. The spring elements 42 are arranged between the screw head 39' of the second locking screws 39 and the output-side coupling body 2. With the spring element 42 it may be the case of a cylindrical compression spring or of several spring disks which form a suitable spring assembly. However elastomeric pressure elements with relatively large compression strength are also considered as spring elements 42, for example plastic rings or plastic disks.
The second locking screws 39 and the spring elements 42 have the object of exerting an attraction force between the output-side coupling body 2 and the intermediate coupling body 3.
The second adjustment screws 38 exert a corresponding counter force. By way of this one sets an exact defined angular position of the output-side coupling body 2 with respect to the intermediate coupling body 3. The passage bores 26 which are passed through by the second locking screws 39 must be accordingly designed so wide that the second locking screws 39 in the passage bores 26 permit the required tilting movement of the output-side coupling body 2.
The number of second locking screws 39 does not play a considerable role per se, but one would preferably also provide three second locking screws 39. At the same time in each case a second locking screw 39 is always provided between two adjustment screws 38.
It is advantageous if the second adjusting screw 38 is an-anged as far as possible from the centre. By way of this one may effect an even more accurate setting. On the other hand this is not so much required for the second locking screws 39. Accordingly Figure 7 shows a particularly preferred arrangement fornl of the second adjustment screws 38 and the locking screws 39.
The embodiment form according to Figures 6 and 7 pennits practically any distancing of the output-side coupling body 2 to the intermediate coupling body 3 in the z-direction. If a relatively large angular correction is required in the xy-direction, then accordingly the distance in the z-direction between the output-side coupling body 2 and the intermediate coupling body 3 must be sufficiently large in order to permit this tilting movement. This is possible without any problem with the embodiment form according to Figures 6 and 7.
It may be advantageous to prevent the penetration of contamination and foreign light from the outside into the device and in particular a dirtying of the lens 40 or of the fibre ends. For this one may realise a type of optical seal for which various solutions are possible. After setting the device e.g. shrinkage flexible tubing may be attached over the device. A
further possibility lies in providing a sleeve 43 in the centric passage bore 22 of the output-side coupling body 2, which extends over the gap between the output-side coupling body 2 and the intermediate coupling body 3 and projects into the further centric lead-through bore 34 of the intermediate coupling body 3.
Of course the lens or the lens system 40 may also be arranged in the intermediate coupling body 3. In both variants the lens or the lens system 40 may be held in a lens carrier 41 and the lens carrier 41 may be designed displaceable in the z-direction.
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List of reference numerals E end piece F lightguiding fibre L light beam V device I input-side coupling body 2 output-side coupling body 3 intermediate coupling piece tube piece 11 flange 12 collar 13 central guide on the input-side 14 planar surface threaded bores in the collar 16 threaded bore for locking screw 17 first adjustment screws 18 first locking screws 19 threaded spring pin 21 tube piece 22 centric lead-through 23 terminal flange 24 inner thread elastic cylinder section 26 passage holes 27 threaded holes 28 second adjustment screws 29 second locking screws truncated cone 31 superficies 32 chamfers 33 pocket hole bore 34 centric lead-through in the intermediate coupling body threaded pocket holes 36 pocket holes 37 cylindrical extension 38 second adjustment screws 39 second locking screws 40 lens 41 lens carrier 42 spring element 43 sleeve
For adjusting the angular position of the output-side coupling body 2 to the input-side coupling body 1, in the flange 23 of the output-side coupling body 2 there are alternatingly incorporated passage holes 26 and threaded holes 27. Second locking screws 29 may be led through the passage holes 26, which engage into threaded pocket holes 35.
Through the threaded holes 27 in the flange 23 there are applied second adjustment screws 28 which in the intermediate coupling body 3 are supported in corresponding pocket holes 36.
The threadless passage holes 26 and pocket holes 36 need to be sufficiently wide in order to permit a certain tilting movement of the screws. The tilting movement which is to be carried out is usually very small and is between 0 and a few degrees.
As is shown in a second embodiment example illustrated in Figure 2, a lens 40 in a lens carrier 41 may also be arranged in the central lead-through 34 of the intermediate coupling body 3 in a manner displaceable by screw. The lightguide F is provided with a commercially available end piece E which is fixedly or releasably connected to the output-side coupling body 2.
In Figure 3 there is shown a similar third embodiment form practically analogously to the Figures 1 and 2, wherein the input-side coupling body I has a thick-walled tube piece 10 whose input-side opening is provided with an end-piece in which a lightguide fibre F
is held. The solution shown here thus shows a fibre-to fibre connection. With this one would attach a collimating lens or a collimating lens system 40 in the input-side coupling body 1, and in the oppositely lying tube piece 21 of the output-side coupling body 2 a focussing lens 40 or a focussing lens system. Otherwise in its construction this embodiment form is the same as the solutions according to Figures 1 and 2.
In Figure 5 there is shown a fourth embodiment form with which the intermediate coupling body 3 on the upper cover surface comprises a cylindrical extension 37 which is connected to this. This cylindrical extension 37 is connected to the intermediate coupling body 3 as one piece. This allows the possibility of screwing two adjustment screws 28 and two locking screws 29 radially through this cylindrical extension piece 37 which then act on the tube piece 21 of the output-side coupling body 2. The output-side coupling body 2 in this case requires no terminal flange 23. This solution is accordingly economical. The second adjustment screws 28 and the second locking screws 29 may lie in one plane which most preferably intersects the cylindrical extension 37 perpendicularly. In order to give the device an even greater stability, further (non-drawn) second adjustment and locking screws may be attached which are axially distanced to the second adjustment and locking screws 28, 29 drawn in Figure 5. The second adjustment and locking screws 28, 29 should be arranged sufficiently distanced from the elastic cylinder section 25 in order to be able to carry out an optimal tilting movement. With the embodiment form shown in Fig. 5 again the arriving light beam L may be led into the lightguide fibre F in an exact alignment in that the parallel displacement and the tilting movement may be carried out independently of one another.
A further, fifth embodiment fonn of the device according to the invention is shown in the vertical section in Figure 6 and in a part plan view in Figure 7. The output-side coupling body 2 is configured here as a disk with a centric passage bore 22 or as a ring. It is adjustable or lockable with respect to the intermediate coupling body 3 by way of two adjustment screws 38 and two locking screws 39.
For adjusting the angular position of the output-side coupling body 2 there are provided second adjustment screws 38. The second adjustment screws 38 are screwed into con:esponding threaded bores 27 in the annular output-side coupling body 2 and are supported on that surface of the intermediate coupling body 3 which faces the output-side coupling body 2.
In order to avoid an over-definition one preferably operates with only three second adjustment screws 38. One advantageously distributes these uniformly over the circumference.
The second Iocking screws 39 in passage bores 26 pass through the annular output-side coupling body 2 and engage into threaded pocket holes 35 in the intermediate coupling body 3.
The second locking screws 39 are supported by way of spring elements 42 on the outer side of the output-side coupling body 2. The spring elements 42 are arranged between the screw head 39' of the second locking screws 39 and the output-side coupling body 2. With the spring element 42 it may be the case of a cylindrical compression spring or of several spring disks which form a suitable spring assembly. However elastomeric pressure elements with relatively large compression strength are also considered as spring elements 42, for example plastic rings or plastic disks.
The second locking screws 39 and the spring elements 42 have the object of exerting an attraction force between the output-side coupling body 2 and the intermediate coupling body 3.
The second adjustment screws 38 exert a corresponding counter force. By way of this one sets an exact defined angular position of the output-side coupling body 2 with respect to the intermediate coupling body 3. The passage bores 26 which are passed through by the second locking screws 39 must be accordingly designed so wide that the second locking screws 39 in the passage bores 26 permit the required tilting movement of the output-side coupling body 2.
The number of second locking screws 39 does not play a considerable role per se, but one would preferably also provide three second locking screws 39. At the same time in each case a second locking screw 39 is always provided between two adjustment screws 38.
It is advantageous if the second adjusting screw 38 is an-anged as far as possible from the centre. By way of this one may effect an even more accurate setting. On the other hand this is not so much required for the second locking screws 39. Accordingly Figure 7 shows a particularly preferred arrangement fornl of the second adjustment screws 38 and the locking screws 39.
The embodiment form according to Figures 6 and 7 pennits practically any distancing of the output-side coupling body 2 to the intermediate coupling body 3 in the z-direction. If a relatively large angular correction is required in the xy-direction, then accordingly the distance in the z-direction between the output-side coupling body 2 and the intermediate coupling body 3 must be sufficiently large in order to permit this tilting movement. This is possible without any problem with the embodiment form according to Figures 6 and 7.
It may be advantageous to prevent the penetration of contamination and foreign light from the outside into the device and in particular a dirtying of the lens 40 or of the fibre ends. For this one may realise a type of optical seal for which various solutions are possible. After setting the device e.g. shrinkage flexible tubing may be attached over the device. A
further possibility lies in providing a sleeve 43 in the centric passage bore 22 of the output-side coupling body 2, which extends over the gap between the output-side coupling body 2 and the intermediate coupling body 3 and projects into the further centric lead-through bore 34 of the intermediate coupling body 3.
Of course the lens or the lens system 40 may also be arranged in the intermediate coupling body 3. In both variants the lens or the lens system 40 may be held in a lens carrier 41 and the lens carrier 41 may be designed displaceable in the z-direction.
~
List of reference numerals E end piece F lightguiding fibre L light beam V device I input-side coupling body 2 output-side coupling body 3 intermediate coupling piece tube piece 11 flange 12 collar 13 central guide on the input-side 14 planar surface threaded bores in the collar 16 threaded bore for locking screw 17 first adjustment screws 18 first locking screws 19 threaded spring pin 21 tube piece 22 centric lead-through 23 terminal flange 24 inner thread elastic cylinder section 26 passage holes 27 threaded holes 28 second adjustment screws 29 second locking screws truncated cone 31 superficies 32 chamfers 33 pocket hole bore 34 centric lead-through in the intermediate coupling body threaded pocket holes 36 pocket holes 37 cylindrical extension 38 second adjustment screws 39 second locking screws 40 lens 41 lens carrier 42 spring element 43 sleeve
Claims (17)
1. A device for optically coupling an arriving light beam with a further-transmitting light-guiding fiber, the device comprising:
(a) a first and a second coupling body, each of said first and second coupling bodies having a centric lead-through for leading through the light beam; and (b) an intermediate coupling body positioned between said first and second coupling bodies and having a centric lead-through for leading through the light beam, wherein the intermediate coupling body is displaceably and lockably held in one plane within the first coupling body, and the second coupling body is mounted in a pivotally and axially displaceable movable manner in the intermediate coupling body, and wherein the first coupling body comprises a planar flange which runs perpendicular to the centric lead-through and is surrounded by a circumferential collar, the circumferential collar being passed through by at least one first adjustment screws and at least one first locking screw, which act on the intermediate coupling body.
(a) a first and a second coupling body, each of said first and second coupling bodies having a centric lead-through for leading through the light beam; and (b) an intermediate coupling body positioned between said first and second coupling bodies and having a centric lead-through for leading through the light beam, wherein the intermediate coupling body is displaceably and lockably held in one plane within the first coupling body, and the second coupling body is mounted in a pivotally and axially displaceable movable manner in the intermediate coupling body, and wherein the first coupling body comprises a planar flange which runs perpendicular to the centric lead-through and is surrounded by a circumferential collar, the circumferential collar being passed through by at least one first adjustment screws and at least one first locking screw, which act on the intermediate coupling body.
2. The device according to claim 1, comprising two first adjustment screws aligned with the enter of the flange, wherein a threaded pin spring is arranged diametrically opposite each of said first adjustment screws as a counter pressure element and is held in the collar.
3. The device according to claim 2, wherein a single first locking screw directed to the center of the flange is present between the two threaded spring pins.
4. The device according to any one of claims 1 to 3, wherein the intermediate coupling body is shaped generally as a truncated cone and has a planar base surface which displaceably rests on a planar surface of the flange of the first coupling body.
5. The device according to claim 4, wherein ground chamfers are provided on the superficies of the truncated cone-shaped intermediate coupling body, the ground chamfers acting as rest surfaces for the first adjustment screws and the first locking screws.
6. The device according to claim 4, wherein the first adjustment screws and the first locking screws passing through the collar are arranged such that they lie perpendicular to the superficies of the truncated cone-shaped intermediate coupling body.
7. The device according to claim 1, wherein the intermediate coupling body has a cylindrical receiving bore which is extended with respect to the centric lead-through and in which a cylindrical tube section of the second coupling body is pivotally mounted with the intermediate arrangement of a radially circumferential, elastic cylinder section.
8. The device according to claim 7, wherein the intermediate coupling body is shaped generally as a truncated cone, and the second coupling body mounted in the intermediate coupling body comprises a flange which is passed through by three second locking screws which engage into threaded holes on the upper surface of the truncated cone-shaped intermediate coupling body, and by three second adjustment screws in threaded holes in the flange which are supported directly on the upper surface of the truncated cone-shaped intermediate coupling body.
9. The device according to claim 8, wherein the three second adjustment screws in threaded holes in the flange are supported in pocket holes.
10. The device according to claim 7, wherein the intermediate coupling body comprises a cylindrical extension connected to an upper cover surface of the intermediate coupling body, the cylindrical extension having a lead-through which is axially flush with the lead-through in the intermediate coupling body, and wherein the second coupling body is held pivotally movably therein by way of second adjustment screws.
11. The device according to claim 10, wherein the second coupling body is fixed in position by second locking screws.
12. The device according to any one of claims 1 to 11, wherein the second coupling body is designed substantially as a disk and is passed through by three second locking screws which are resiliently supported on the second coupling body, and are connected in screw connection to the intermediate coupling body, and wherein three peripheral adjustment screws are present which are held in screw connection in the second coupling body in a freely movable manner, and are supported on the intermediate coupling body.
13. The device according to any one of claims 1 to 12, wherein at least one lens is arranged in the device.
14. The device according to any one of claims 1 to 13, wherein one of the first and second coupling bodies is designed as a bulk head for connection to a laser light source and at least one collimating lens is arranged in the other of the first and second coupling bodies.
15. The device according to any one of claims 1 to 14, wherein a lightguide fiber connects to each of said first and second coupling bodies, the first coupling body is an input-side coupling body in which there is arranged a collimating lens, and a focusing lens is arranged in the intermediate coupling body.
16. The device according to any one of claims 1 to 15, wherein one of the first and second coupling bodies is designed as a bulk head for connection to a laser light source and at least one collimating lens is arranged in the intermediate coupling body.
17. The device according to any one of claims 1 to 16, wherein a lightguide fiber connects to each of said first and second coupling bodies, the first coupling body is an input-side coupling body in which there is arranged a collimating lens, the second coupling body is an output-side coupling body, and a focusing lens is arranged in the output-side coupling body.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH2190/00 | 2000-11-10 | ||
| CH21902000 | 2000-11-10 | ||
| CH2246/00 | 2000-11-17 | ||
| CH22462000 | 2000-11-17 | ||
| PCT/CH2001/000656 WO2002039152A2 (en) | 2000-11-10 | 2001-11-08 | Optical waveguide coupling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2428381A1 CA2428381A1 (en) | 2002-05-16 |
| CA2428381C true CA2428381C (en) | 2008-07-22 |
Family
ID=25739045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002428381A Expired - Fee Related CA2428381C (en) | 2000-11-10 | 2001-11-08 | Lightguide coupling |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US7128473B2 (en) |
| EP (1) | EP1332394B1 (en) |
| JP (1) | JP2004512576A (en) |
| CN (1) | CN1250994C (en) |
| AT (1) | ATE352051T1 (en) |
| AU (1) | AU2002212029A1 (en) |
| CA (1) | CA2428381C (en) |
| DE (1) | DE50111911D1 (en) |
| WO (1) | WO2002039152A2 (en) |
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|---|---|---|---|---|
| JP4202351B2 (en) * | 2005-09-27 | 2008-12-24 | 中部日本マルコ株式会社 | Non-contact connector |
| DE102007051294B4 (en) * | 2007-07-20 | 2012-03-22 | Lasos Lasertechnik Gmbh | Optical connector for optical fibers |
| US20100260454A1 (en) * | 2009-04-10 | 2010-10-14 | Raytheon Company | Laser to optical fiber coupling device and method |
| US8515228B2 (en) * | 2009-06-23 | 2013-08-20 | Raytheon Canada Limited | Method and apparatus for accurately positioning an optical fiber end |
| DE102010041689B4 (en) | 2010-09-29 | 2021-04-22 | Lasos Lasertechnik Gmbh | Socket for receiving a plug with a light guide |
| US20140016897A1 (en) * | 2011-08-16 | 2014-01-16 | TeraDiode, Inc. | Adjustable Fiber Optic Module System and Method |
| JP5754317B2 (en) * | 2011-09-15 | 2015-07-29 | 富士通株式会社 | Optical connector |
| DE102013202487A1 (en) | 2013-02-15 | 2014-08-21 | Bruker Nano Gmbh | Device for spatial alignment of an X-ray optics and apparatus with such |
| WO2014182212A1 (en) * | 2013-05-08 | 2014-11-13 | Optoskand Ab | Optoelectronic component |
| KR102443407B1 (en) * | 2014-03-06 | 2022-09-16 | 소니그룹주식회사 | Optical connector, cable, and optical communication device |
| CN104062724B (en) * | 2014-05-29 | 2016-01-20 | 奉化市宇达高科光电器件有限公司 | Light receiving element |
| CN113791472A (en) * | 2021-11-18 | 2021-12-14 | 之江实验室 | Optical fiber coupler capable of being precisely adjusted in multiple dimensions |
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| FR2363122A1 (en) * | 1976-08-24 | 1978-03-24 | Cit Alcatel | AUTOMATICALLY CENTERED CONNECTOR FOR OPTICAL FIBERS |
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- 2001-11-08 US US10/416,821 patent/US7128473B2/en not_active Expired - Lifetime
- 2001-11-08 EP EP01980101A patent/EP1332394B1/en not_active Expired - Lifetime
- 2001-11-08 AU AU2002212029A patent/AU2002212029A1/en not_active Abandoned
- 2001-11-08 AT AT01980101T patent/ATE352051T1/en not_active IP Right Cessation
- 2001-11-08 DE DE50111911T patent/DE50111911D1/en not_active Expired - Lifetime
- 2001-11-08 JP JP2002541422A patent/JP2004512576A/en active Pending
- 2001-11-08 WO PCT/CH2001/000656 patent/WO2002039152A2/en active IP Right Grant
- 2001-11-08 CA CA002428381A patent/CA2428381C/en not_active Expired - Fee Related
- 2001-11-08 CN CN01820030.3A patent/CN1250994C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE50111911D1 (en) | 2007-03-08 |
| WO2002039152A3 (en) | 2002-12-19 |
| AU2002212029A1 (en) | 2002-05-21 |
| US20050147347A1 (en) | 2005-07-07 |
| CN1478211A (en) | 2004-02-25 |
| ATE352051T1 (en) | 2007-02-15 |
| WO2002039152A2 (en) | 2002-05-16 |
| US7128473B2 (en) | 2006-10-31 |
| CA2428381A1 (en) | 2002-05-16 |
| EP1332394A2 (en) | 2003-08-06 |
| EP1332394B1 (en) | 2007-01-17 |
| JP2004512576A (en) | 2004-04-22 |
| CN1250994C (en) | 2006-04-12 |
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| EEER | Examination request | ||
| MKLA | Lapsed |