CA1119858A - Optical fibre adaptor - Google Patents
Optical fibre adaptorInfo
- Publication number
- CA1119858A CA1119858A CA000334502A CA334502A CA1119858A CA 1119858 A CA1119858 A CA 1119858A CA 000334502 A CA000334502 A CA 000334502A CA 334502 A CA334502 A CA 334502A CA 1119858 A CA1119858 A CA 1119858A
- Authority
- CA
- Canada
- Prior art keywords
- cavity
- ferrule
- optical
- fibre
- optical fibre
- 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.)
- Expired
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 24
- 230000005693 optoelectronics Effects 0.000 claims abstract description 8
- 239000000835 fiber Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 238000005253 cladding Methods 0.000 claims description 5
- 230000004323 axial length Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
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
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
- G02B6/3847—Details of mounting fibres in ferrules; Assembly methods; Manufacture with means preventing fibre end damage, e.g. recessed fibre surfaces
-
- 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
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/381—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres
- G02B6/3818—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres of a low-reflection-loss type
- G02B6/3821—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres of a low-reflection-loss type with axial spring biasing or loading means
-
- 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
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/381—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres
- G02B6/3825—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres with an intermediate part, e.g. adapter, receptacle, linking two plugs
-
- 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
- G02B6/421—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical component consisting of a short length of fibre, e.g. fibre stub
-
- 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
- G02B6/4292—Coupling light guides with opto-electronic elements the light guide being disconnectable from the opto-electronic element, e.g. mutually self aligning arrangements
-
- 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
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
- G02B6/3854—Ferrules characterised by materials
Abstract
ABSTRACT
An adaptor comprises a ferrule having a cylindrical front end portion which is radially resiliently compressible and formed with a concentric bore communicating axially with a cavity formed in a rear end of the ferrule, a predetermined length of optical fibre bonded in the bore with a first optical face substantially flush with the front end and the second optical face protruding into the cavity, an optoelectronic transducer potted in the cavity in operative alignment with the second optical face.
An adaptor comprises a ferrule having a cylindrical front end portion which is radially resiliently compressible and formed with a concentric bore communicating axially with a cavity formed in a rear end of the ferrule, a predetermined length of optical fibre bonded in the bore with a first optical face substantially flush with the front end and the second optical face protruding into the cavity, an optoelectronic transducer potted in the cavity in operative alignment with the second optical face.
Description
111~8SI~
Thc invenl:ion relates to an adaptor providing a connection betweel1 an optical fibre and an optoelectronic transducer.
Prob]ems arise in connecting optical fibres with optoelectronic transducers such as photodiodes, light emitting diodes or phototransistors~ Care must be taken to prevent damage to the transducers and to minimise attenuation at the optical interfaces.
Connecting optical fibres to the transducers has therefore proved time consuming and difficult.
An adaptor according to the invention comprises a ferrule having a cylindrical front end portion which is radially resiliently compressible and form~d with a concentric bore communicating axially with a ]5 cavity forMed in a rear end of the ferrule, a predetermined length of optical fibre shorter than the axial length of the ferrule bonded in the bore with a first optical face substantially flush with the front end and a second optical face protruding a predetermined distance into the cavity operatively aligned with and spaced axially from an optoelectronic transducex carried by a header received as a press fit in the cavity and seated against a rearwardly facing shoulder formed in the cavity.
The adaptor provides a package which may be readily manipulated without risk of damage to the transducer and which may be readily connected to ~ - 2 -.,, ~,~
111~13S~
another-opt.ical fihre connect.or.
According to another aspect of the invention, a method of making an adaptor comprises the steps of radially enlar~ing a predetermined length of optical fibre by eoating the optical fibre core with a suitable optical cladding material; providing an optical face on one end of the fibre; bonding the other end of the fibre in a bore formed concentrically in a radially resi.liently compress..ble, eylindrical front end portion of the ferrule with the optical face protruding a predetermined distanee into a cavity formed in a rear end of the ferrule; polishing the other end of the fibre to provide another optical face flush with the front end of the ferrule; press-fitting a header carrying an optoelectronie transdueer in the eavity agai.nst a rearwardly faeing shoulder formed in the rear end of the eavity so that the transdueer is spaced axially from and in operative alignment with the optieal ibre; and filling the eavity with encapsulating material.
B ~ 3 -~ specific example of the invention will now be described with reference to the accompanying drawings, in which:
Figure 1 is an axial cross-sectional view of a connector f~rrule;
Figure 2 is an end view of the ferrule;
Figure 3 is a view similar to Figure 1 during mounting an optical fibre in the ferrule;
Figure 4 is an axial cross-sectional view of an assembled connector;
Figure 5 is an axial cross-sectional view - 3a -11198SE~
of the connector mounted on a printed circuit board and aligned for mating with a complementary fibre optic connector; and Figure 6 is an enlarged cross-sectional view of a portion of the mated connector adjacent their optical faces.
The adaptor comprises a ferrule 1 in which is bonded a predetermined length of optical fibre 34 operatively aligned with an optoelectronic transducer such as a light emitting diode 54.
The adaptor ferrule 1 is integrally moulded from plastics material and has a radially resiliently .compressible, cylindrical front ~nd portion 2 having a right cylindrical end face 4 intermediate a ~rusto-conical portion 6 tapering outwardly from the front end to a rear end portion 8 of enlarged diameter having a rear end face 10. A radially outwardly projecting shoulder.ll extends around the junction of portions 6 and 8. A bore 12 is formed concentrically in front end portion 2 and extends rearwardly through part of portion 6 and communicates with a partly frusto-conical cavity 14 which communicates rearwardly with an enlarged, right cylindrical cavity 16 communicating with a r~ght cylindrical counterbore at the rear-end face.
An axially extending planar surface 20 projects into cavity 14 defining a shoulder 22 joining an arcuate shoulder 24 at the junction of cavities 14 and 16. A passayeway 26 extends through the projection 20 in communication with cavi.ties 14, 16 and 18. An arcuate shoulder 28 is defined at the junction of cavity 16 and Counterbore 18 and is coplanar with a polarising aperture 30 formed in the wall of counterbore 18.
flat 32 is formed on the base of the rear end for handling purposes.
o The optical fibre comprises a glass or plastics core 36 of 8 mils diameter surrounded by optical cladding 38 which has either replaced the original cladding or coated over the origianl cladding to ensure that the core is concentric with the ferrule portion 2 providing an overall diameter of 40 mils. Prior to assembling the . optical fibre with the ferrule, one end 42 is polished to provide a flat optical face, the optical fibres coated with adhesive and inserted with the other, unpolished end, leading through the rear end of the ferrule along the bore 12 until.it protrudes out of the front end (Figure 3).
A locating jlg 44 comprises a cylindrical rigid metal or plastics block having an outer diameter 25 conforming to the diameter of cavity 14 and a boss 48 haviny a stepped internal recess 50 receiving the end 42 of the optical fibre is used precisely to locate the optical fibre until the adhesive has set and to protect the polished face of the core from contamination. The end 44 of the optical fibre is then polished flush with the front end 4 of the ferrule to provide the other optical face.
The optoelectronic device comprises a light emitting diode 54 mounted on a planar face 55 of a can 52 from which leads 66, 68 extend rearwardly.
The can is provided at the rear with a polarising tab 64 receivable in aperture 30 to orientate the can in the ferrule for correct connection to the leads. The can is received at a press fit in the cavity 16 with the face 55 abutting shoulders 22 and 24 precisely locating the diode 54, spaced a predetermined distance from, and operatively aligned with, the core axis.
The can may be bonded in the cavity by filling the cavity with epoxy resin prior to insertlon of the can. Excess resin escapes through passageway 26 and the residue encapsulates and fill~
the can (through a hole in the can rear, not shown).
The adaptor may be mounted on a printed circuit board 70 and a splice bush 80 clamped to the board with the front end of the ferrule received as a force fit within a central passageway 90 and a shoulder 84 on the bush abutting shoulder 11 11~9~3~
of the connector. The front end of the bush has a concentric sleeve 86 which receives a circular section flange 106 of a mating connactor 94 in whlch an optic fibre 100 terminated by the method disclosed in our United States Patent Specification No. 3,999,837 (8622) is mounted by a compression spring 110. As the front ends 102 of the connector and adaptor are concentric within the passageway 90, axial alignment of the optical cores is obtained inspite of different core diameters, while engagement of bulging ferrule material ma~ntains a small gap between the cores, preventing abrasion of their polished ends (as shown in Figure 6).
Thc invenl:ion relates to an adaptor providing a connection betweel1 an optical fibre and an optoelectronic transducer.
Prob]ems arise in connecting optical fibres with optoelectronic transducers such as photodiodes, light emitting diodes or phototransistors~ Care must be taken to prevent damage to the transducers and to minimise attenuation at the optical interfaces.
Connecting optical fibres to the transducers has therefore proved time consuming and difficult.
An adaptor according to the invention comprises a ferrule having a cylindrical front end portion which is radially resiliently compressible and form~d with a concentric bore communicating axially with a ]5 cavity forMed in a rear end of the ferrule, a predetermined length of optical fibre shorter than the axial length of the ferrule bonded in the bore with a first optical face substantially flush with the front end and a second optical face protruding a predetermined distance into the cavity operatively aligned with and spaced axially from an optoelectronic transducex carried by a header received as a press fit in the cavity and seated against a rearwardly facing shoulder formed in the cavity.
The adaptor provides a package which may be readily manipulated without risk of damage to the transducer and which may be readily connected to ~ - 2 -.,, ~,~
111~13S~
another-opt.ical fihre connect.or.
According to another aspect of the invention, a method of making an adaptor comprises the steps of radially enlar~ing a predetermined length of optical fibre by eoating the optical fibre core with a suitable optical cladding material; providing an optical face on one end of the fibre; bonding the other end of the fibre in a bore formed concentrically in a radially resi.liently compress..ble, eylindrical front end portion of the ferrule with the optical face protruding a predetermined distanee into a cavity formed in a rear end of the ferrule; polishing the other end of the fibre to provide another optical face flush with the front end of the ferrule; press-fitting a header carrying an optoelectronie transdueer in the eavity agai.nst a rearwardly faeing shoulder formed in the rear end of the eavity so that the transdueer is spaced axially from and in operative alignment with the optieal ibre; and filling the eavity with encapsulating material.
B ~ 3 -~ specific example of the invention will now be described with reference to the accompanying drawings, in which:
Figure 1 is an axial cross-sectional view of a connector f~rrule;
Figure 2 is an end view of the ferrule;
Figure 3 is a view similar to Figure 1 during mounting an optical fibre in the ferrule;
Figure 4 is an axial cross-sectional view of an assembled connector;
Figure 5 is an axial cross-sectional view - 3a -11198SE~
of the connector mounted on a printed circuit board and aligned for mating with a complementary fibre optic connector; and Figure 6 is an enlarged cross-sectional view of a portion of the mated connector adjacent their optical faces.
The adaptor comprises a ferrule 1 in which is bonded a predetermined length of optical fibre 34 operatively aligned with an optoelectronic transducer such as a light emitting diode 54.
The adaptor ferrule 1 is integrally moulded from plastics material and has a radially resiliently .compressible, cylindrical front ~nd portion 2 having a right cylindrical end face 4 intermediate a ~rusto-conical portion 6 tapering outwardly from the front end to a rear end portion 8 of enlarged diameter having a rear end face 10. A radially outwardly projecting shoulder.ll extends around the junction of portions 6 and 8. A bore 12 is formed concentrically in front end portion 2 and extends rearwardly through part of portion 6 and communicates with a partly frusto-conical cavity 14 which communicates rearwardly with an enlarged, right cylindrical cavity 16 communicating with a r~ght cylindrical counterbore at the rear-end face.
An axially extending planar surface 20 projects into cavity 14 defining a shoulder 22 joining an arcuate shoulder 24 at the junction of cavities 14 and 16. A passayeway 26 extends through the projection 20 in communication with cavi.ties 14, 16 and 18. An arcuate shoulder 28 is defined at the junction of cavity 16 and Counterbore 18 and is coplanar with a polarising aperture 30 formed in the wall of counterbore 18.
flat 32 is formed on the base of the rear end for handling purposes.
o The optical fibre comprises a glass or plastics core 36 of 8 mils diameter surrounded by optical cladding 38 which has either replaced the original cladding or coated over the origianl cladding to ensure that the core is concentric with the ferrule portion 2 providing an overall diameter of 40 mils. Prior to assembling the . optical fibre with the ferrule, one end 42 is polished to provide a flat optical face, the optical fibres coated with adhesive and inserted with the other, unpolished end, leading through the rear end of the ferrule along the bore 12 until.it protrudes out of the front end (Figure 3).
A locating jlg 44 comprises a cylindrical rigid metal or plastics block having an outer diameter 25 conforming to the diameter of cavity 14 and a boss 48 haviny a stepped internal recess 50 receiving the end 42 of the optical fibre is used precisely to locate the optical fibre until the adhesive has set and to protect the polished face of the core from contamination. The end 44 of the optical fibre is then polished flush with the front end 4 of the ferrule to provide the other optical face.
The optoelectronic device comprises a light emitting diode 54 mounted on a planar face 55 of a can 52 from which leads 66, 68 extend rearwardly.
The can is provided at the rear with a polarising tab 64 receivable in aperture 30 to orientate the can in the ferrule for correct connection to the leads. The can is received at a press fit in the cavity 16 with the face 55 abutting shoulders 22 and 24 precisely locating the diode 54, spaced a predetermined distance from, and operatively aligned with, the core axis.
The can may be bonded in the cavity by filling the cavity with epoxy resin prior to insertlon of the can. Excess resin escapes through passageway 26 and the residue encapsulates and fill~
the can (through a hole in the can rear, not shown).
The adaptor may be mounted on a printed circuit board 70 and a splice bush 80 clamped to the board with the front end of the ferrule received as a force fit within a central passageway 90 and a shoulder 84 on the bush abutting shoulder 11 11~9~3~
of the connector. The front end of the bush has a concentric sleeve 86 which receives a circular section flange 106 of a mating connactor 94 in whlch an optic fibre 100 terminated by the method disclosed in our United States Patent Specification No. 3,999,837 (8622) is mounted by a compression spring 110. As the front ends 102 of the connector and adaptor are concentric within the passageway 90, axial alignment of the optical cores is obtained inspite of different core diameters, while engagement of bulging ferrule material ma~ntains a small gap between the cores, preventing abrasion of their polished ends (as shown in Figure 6).
Claims (4)
1. An adaptor comprising a ferrule having a cylindrical front end portion which is radially resiliently compressible and formed with a concentric bore communicating axially with a cavity formed in a rear end of the ferrule, a predetermined length of optical fibre shorter than the axial length of the ferrule bonded in the bore with a first optical face substantially flush with the front end and a second optical face protruding a predetermined distance into the cavity operatively aligned with and spaced axially from an optoelectronic transducer carried by a header received as a press fit in the cavity and seated against a rearwardly facing shoulder formed in the cavity.
2. An adaptor according to Claim 1, in which the cavity is filled with a suitable encapsulating material and electrical leads extend rearwardly from the transducer out of the encapsulating material.
3. An adaptor according to Claim 2, in which the ferrule is formed with a drainage passageway communicating with the cavity.
4. A method of making an adaptor according to Claim 1 including the steps of radially enlarging a predetermined length of optical fibre by coating the optical fibre core with a suitable optical cladding material; providing an optical face on one end of the fibre; bonding the other end of the fibre in a bore formed concentrically in a radially resiliently compressible, cylindrical front end portion of the ferrule with the optical face protruding a predetermined distance into a cavity formed in a rear end of the ferrule; polishing the other end of the fibre to provide another optical face flush with the front end of the ferrule; press-fitting a header carrying an optoelectronic transducer in the cavity against a rearwardly facing shoulder formed in the rear end of the cavity so that the transducer is spaced axially from and in operative alignment with the optical fibre; and filling the cavity with encapsulating material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US944,937 | 1978-09-22 | ||
| US05/944,937 US4186996A (en) | 1978-09-22 | 1978-09-22 | Optic adaptor junction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1119858A true CA1119858A (en) | 1982-03-16 |
Family
ID=25482325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000334502A Expired CA1119858A (en) | 1978-09-22 | 1979-08-27 | Optical fibre adaptor |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4186996A (en) |
| EP (1) | EP0009330B1 (en) |
| JP (1) | JPS5545095A (en) |
| CA (1) | CA1119858A (en) |
| DE (1) | DE2963111D1 (en) |
| ES (1) | ES245711Y (en) |
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| JPS4927233A (en) * | 1972-07-03 | 1974-03-11 | ||
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| FR2295437A1 (en) * | 1974-12-20 | 1976-07-16 | Thomson Csf | OPTICAL TRANSMISSION LINK SYSTEM BY MEANS OF LIGHT GUIDES |
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| US3995935A (en) * | 1975-04-28 | 1976-12-07 | International Telephone And Telegraph Corporation | Optical coupler |
| DE7519901U (en) * | 1975-06-23 | 1975-11-13 | Planck M Gesellschaft Zur Foerderung Der Wissenschaften | LIGHT GUIDE COUPLING |
| US4065203A (en) * | 1975-12-10 | 1977-12-27 | International Telephone And Telegraph Corporation | Couplers for electro-optical elements |
| US4119363A (en) * | 1976-03-18 | 1978-10-10 | Bell Telephone Laboratories Incorporated | Package for optical devices including optical fiber-to-metal hermetic seal |
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| US4033668A (en) * | 1976-04-08 | 1977-07-05 | Bell Telephone Laboratories, Incorporated | Solderable glass splices, terminations and hermetic seals |
| AU509830B2 (en) * | 1976-12-14 | 1980-05-29 | International Standard Electric Corporation | An electro-optical mounting device |
-
1978
- 1978-09-22 US US05/944,937 patent/US4186996A/en not_active Expired - Lifetime
-
1979
- 1979-08-24 EP EP79301738A patent/EP0009330B1/en not_active Expired
- 1979-08-24 DE DE7979301738T patent/DE2963111D1/en not_active Expired
- 1979-08-27 CA CA000334502A patent/CA1119858A/en not_active Expired
- 1979-09-20 JP JP12154379A patent/JPS5545095A/en active Granted
- 1979-09-21 ES ES1979245711U patent/ES245711Y/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4186996A (en) | 1980-02-05 |
| JPS6244243B2 (en) | 1987-09-18 |
| EP0009330A1 (en) | 1980-04-02 |
| DE2963111D1 (en) | 1982-08-05 |
| ES245711U (en) | 1980-01-16 |
| ES245711Y (en) | 1980-07-01 |
| JPS5545095A (en) | 1980-03-29 |
| EP0009330B1 (en) | 1982-06-16 |
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