CA1110889A - Laminated strength members for fiber optic cable - Google Patents
Laminated strength members for fiber optic cableInfo
- Publication number
- CA1110889A CA1110889A CA322,493A CA322493A CA1110889A CA 1110889 A CA1110889 A CA 1110889A CA 322493 A CA322493 A CA 322493A CA 1110889 A CA1110889 A CA 1110889A
- Authority
- CA
- Canada
- Prior art keywords
- cable
- laminant
- strength member
- fiber optic
- set forth
- 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
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
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
-
- 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
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
- G02B6/4432—Protective covering with fibre reinforcements
Abstract
ABSTRACT
A fiber optic cable having a plurality of pre-stretched strength members associated therewith. The strength members are maintained in a pre-stretched condition by adhering the strength members to at least one laminant after stretching. The strength members are pre-stretched by a stretching force equal to or greater than the predetermined longitudinal break strength for associated optical fibers. The laminate holding the strength members it placed in a direction parallel to the fiber optic core and substantially surrounding the core. Thus, the strength members will provide a force on the termination opposite the longitudinal stress forces placed on the fiber optic core.
A fiber optic cable having a plurality of pre-stretched strength members associated therewith. The strength members are maintained in a pre-stretched condition by adhering the strength members to at least one laminant after stretching. The strength members are pre-stretched by a stretching force equal to or greater than the predetermined longitudinal break strength for associated optical fibers. The laminate holding the strength members it placed in a direction parallel to the fiber optic core and substantially surrounding the core. Thus, the strength members will provide a force on the termination opposite the longitudinal stress forces placed on the fiber optic core.
Description
8~
~ACXG~OUr~n ~ T~F I~ ENTIO~ , -This invention relates to an imProvQd fiber o~tic cable. ~1Ore ~articularly, it relates to the use of ~re-stretched strength members ~arallel to o~tical fihers for ~rovidinq a force equal to or greater than the predetermined break strength of an o~tical fiber.
With the realization of thQ limited number of communication channels available in metal con~uctor electrical communication cable, the use of o~tical fibers ~ith modulated liaht sources for communication is fast becoming a reality. ~n ,o~tical fiber provides at least one order of magnitude more channels Per tranmission path than a metal con~uctor.
¦~ One of the major Problems in the use of o~tical fibers llis that they are normally ~ade of qlass and thus are easily ''broken. One type of hreaka~e occurs when the cable, and thus ,optical fiber, is placed under a lonqitudinal load, causinq longitudinal stress and strain on the fiber. Several means have been devised to overcome this Droblem of longitudinal stress. U.
S. Patent 3,855,870 shows a Plurality of o~tical ~ibers arran~ed in a helical fashion about the core of the cable. Durin,q longitudinal stress, the Ditch in each helical turn will lose am~litude to absorb the stress on the fibers rather than the fibers themselves.
' U. S. Patent 3,883,218 also discloses the use of a , helical wound fiber bundle which also takes u~ stress ~uring longitudinal load on the cable. Furthermore, this Patent discloses a reinforcing member inserted in the center of the f iber bundle ~or ~rovidinq strenath to the cable as well as overco~ing certain stress ~roblems.
The use of helical fibers Pose severe manufacturinn problems as well as imPaire~ liqht transmission.
U. S. Patent 4,009,932 discloses the use of strenath members parallel to the o~tical fiber in a o~tical cahle core.
The stren~th members are made of metal wires which have a much higher break strength than the fiber. The use of these metal strength members increases the cost of the resulting cable.
Furthermore, the metal wire acts as an antenna which could cause electrical interference with the electronics at both ends of the cable.
While all of these above natents disclose means o~
protecting optical fibers from longitudinal stress, there is a need to provide a simPle and relatively inex~ensive means of protecting optical fibers.
... :
O~J~CT OF TH~ INvENTIn~l It i8 therefore one ob~ect of this invention to provide a fiber ontic cable havinq an im~roved means for protectina o~tical fibers from longitudinal stress.
It is another obiect to provide an inexpensive an~
relatively simple method of manu~acturing a fiher optic cable having protection from lon~itudinal stress.
SVM~AP~Y OF THE I~JVENTIO~J
~ here is provided a fiber ontic cable havinq a fiber optic core. ~t least one Dre-stretched elastic strength member is Droviæed parallel to the fiber o~tic core. The ~re-stretched strength member is kept in its pre-stretched con~ition bv adherence to at least one laminant which substantially circumscribes the fiber ontic core. ~s a result o~ this stretching, the strength member Drovides a force in the o~posite direction to longitudinal load stress that may be placed on the fiber optic core.
In accordance with another form of this invention there is provided a method for making an improved fiber optic cable. The method comprises pre-stretching at least one strength member; adhering the strength member to a laminant, holding the pre-stretched strength member in its elongated position wrapping the laminant about the fiber optic core.
According to a further broad aspect of the present invention there is provided a fiber optic cable comprising a fiber optic core including at least one optical fiber adapted to receive optical communication signals. At least one elastic strength member is provided parallel to the fiber optic core. The strength member is in a stretched condition. Means is also provided for maintaining the strength member in a stretched condition whereby the strength member is adapted to apply a force in the opposite direction to longitudinal stress forces on the cable for protecting the optical fiber from longitudinal stress.
According to a still further broad aspect of the present invention there is provided a method for providing longitudinal stress protection for a fiber optic cable. The method comprises the steps of provid-ing an optical fiber having a predetermined longitudinal break force, stretching at least one elastic strength member with a force e~ual to or greater than the break strength force of the optical fiber, applying at least one strength member to a laminant, securing the strength member to the laminant in its stretched condition with an adhesive, and circumscribing the optical fiber with ~ 4 -the at least one laminant.
BRIEF DESCRIPTION OF THE DRAWINGS
The subject matter which is regarded as the invention is set forth in the appended claims. The invention, however, together with further objects and advantages thereof may be better understood with reference to the following description taken in conjunc-tion with the accompanying drawings in which:
FIGURE 1 is a partial isometric view with portions removed, of a fiber optic cable having pre-stretched strength members in accordance with one form of this invention, FIGURE 2 is a sectional end view of the fiber optic cable shown in Figure 1, FIGURE 3 is a partial top view of the laminated pre-stretched strength members showing further aspects of this invention, FIGURE 4 is a sectional end view of the laminated fiber optic strength members shown in Figure 3.
DESCRIPTION_OF THE_PREFERRED EMBODIME~T
Referring now more particularly to Figure 1, there is provided fiber optic cable 1 shown with its structure partially removed in a staggered manner from the inner fiber to the outer jacket. Optical fiber 2 in this embodiment is made of a glass material. A
suitable glass optical fiber may be obtained from the Corning Glass Works or from other commercial sources.
Optical fiber 2 may be replaced by a bundle of optical fibers without departing from the spirit of the invention.
In this embodiment, optical fiber 2 is covered by a material 3 which protects the optical fiber from abrasion and also from external forces in the perpendicular - 4a -direction to the horizontal axis of fiber 2. Protection member 3 may be made from many materials such as plastics including polyvinylchloride. The protection member may be extruded over the optical fiber.
Sheath 6 may be extruded over the top of the core 7, also providing protection for the core. This sheath may be made from a synthetic resin such as poly-urethane. Laminant 4 acts as a carrier for a plurality of optical strength members 5 and may be made of various materials such as polyester. The strength members may be made of various elastic materials such as Kevlar*, nylon or polyester. Since these types of strength members may be elongated by a force less than the force required to break the glass fiber, the strength members 5 are stretched prior to their use. An adhesive coating 8 is placed on the top side of laminant 4 for adhering the stretched strength members to the laminant, and also for holding the strength members in their pre-stretched position.
As can be seen from Figure 2, the strength members 5 are placed symmetrically about the cable core by wrapping the laminant 4 thereabout and the restrain-ing forces applied by the strength members are relatively even about the core to prevent bending of the fiber. The relationship between the laminant 4, the strength member 5, and the adhesive coating 8 may be more clearly seen with reference to Figure 4.
Figure 4 shows an end cross-sectional view of the laminant 4 having the strength members attached thereto prior to *Registered Trade Mark of DuPont Company it being wra~ed about the cable core. As can be seen from Fiqure 4, there is ~rovided a thin layer of adhesive 8 in which the strenqth ~embers 5 are embedde~. Adhesive may be anv ~ressure-sensitive or heat-sensitive adhesive such as an e~oxy resin of sufficient strenqth to hold a strength member such 2S
Kevlar in a nre-stretched ~osition of at least ~rom 7 x l Pounds oer s~uare inch to 19 x 106 ~ounds ~er square inch pressure de~en~ing on the break strength of the oPtical fiber and the desired Protection level. A second laminant (not shown) with accompanying adhesive, like laminant 4 and adhesive 8, could be a~Plied to the other side of the strenqth members without fle~artin~ from the soirit of the invention.
,~ The cable shown in Figure 1 may be manufactured in the ¦Ifollowinq manner:
An o~tical fiber 2 or ~iber bundle is ~rovided.
Polyvinylchloride ~rotection member 3 may be extruded over the fiber. ~he force reauire~ to break the fiber in its lonqitudinal direction is measured or calculated. A ~luralitY of ~evlar stren~th members are stretched so as to a~P~lY a force in the on~osite ~irection to the calculated break force of the oPtical fiber. In the ~referred embodiment this stretch orce will be aP~roximately equal to the calculated break force of the optical fiber. ~ormally, the strength members will ~e stretched to a point where they will elonqate less than 1~ more.
The stretched strength members are symetricallY aPDlied to a tape comDrising a laminate with adhesive on one side. The adhesive should be stron~ enou~h to hold the strength member in their stretched condition. The strength members ~ay be-sandwiched between a Pair of such tapes to insure that they are held in their stretched condition.
The laminated strenqth members are ~laced around the core containin~ the oDtical fiber or fibers. ~ synthetic resin Drotective sheath may then be extruded over the laminated ~.C~ g9 strength members.
From the fore~oinq descriotion of the ~referred embodiment of the invention, it ~ould be a~Darent that many modifications may ~e made therein. It will ke understood, therefore, that this embodiment is intended as an exem~lification only and that the invention is not limited thereto. It is to be understood, therefore, that it is intended that the pendinq claims cover all such modifications that shall fall within the true spirit and scope of the invention.
~ACXG~OUr~n ~ T~F I~ ENTIO~ , -This invention relates to an imProvQd fiber o~tic cable. ~1Ore ~articularly, it relates to the use of ~re-stretched strength members ~arallel to o~tical fihers for ~rovidinq a force equal to or greater than the predetermined break strength of an o~tical fiber.
With the realization of thQ limited number of communication channels available in metal con~uctor electrical communication cable, the use of o~tical fibers ~ith modulated liaht sources for communication is fast becoming a reality. ~n ,o~tical fiber provides at least one order of magnitude more channels Per tranmission path than a metal con~uctor.
¦~ One of the major Problems in the use of o~tical fibers llis that they are normally ~ade of qlass and thus are easily ''broken. One type of hreaka~e occurs when the cable, and thus ,optical fiber, is placed under a lonqitudinal load, causinq longitudinal stress and strain on the fiber. Several means have been devised to overcome this Droblem of longitudinal stress. U.
S. Patent 3,855,870 shows a Plurality of o~tical ~ibers arran~ed in a helical fashion about the core of the cable. Durin,q longitudinal stress, the Ditch in each helical turn will lose am~litude to absorb the stress on the fibers rather than the fibers themselves.
' U. S. Patent 3,883,218 also discloses the use of a , helical wound fiber bundle which also takes u~ stress ~uring longitudinal load on the cable. Furthermore, this Patent discloses a reinforcing member inserted in the center of the f iber bundle ~or ~rovidinq strenath to the cable as well as overco~ing certain stress ~roblems.
The use of helical fibers Pose severe manufacturinn problems as well as imPaire~ liqht transmission.
U. S. Patent 4,009,932 discloses the use of strenath members parallel to the o~tical fiber in a o~tical cahle core.
The stren~th members are made of metal wires which have a much higher break strength than the fiber. The use of these metal strength members increases the cost of the resulting cable.
Furthermore, the metal wire acts as an antenna which could cause electrical interference with the electronics at both ends of the cable.
While all of these above natents disclose means o~
protecting optical fibers from longitudinal stress, there is a need to provide a simPle and relatively inex~ensive means of protecting optical fibers.
... :
O~J~CT OF TH~ INvENTIn~l It i8 therefore one ob~ect of this invention to provide a fiber ontic cable havinq an im~roved means for protectina o~tical fibers from longitudinal stress.
It is another obiect to provide an inexpensive an~
relatively simple method of manu~acturing a fiher optic cable having protection from lon~itudinal stress.
SVM~AP~Y OF THE I~JVENTIO~J
~ here is provided a fiber ontic cable havinq a fiber optic core. ~t least one Dre-stretched elastic strength member is Droviæed parallel to the fiber o~tic core. The ~re-stretched strength member is kept in its pre-stretched con~ition bv adherence to at least one laminant which substantially circumscribes the fiber ontic core. ~s a result o~ this stretching, the strength member Drovides a force in the o~posite direction to longitudinal load stress that may be placed on the fiber optic core.
In accordance with another form of this invention there is provided a method for making an improved fiber optic cable. The method comprises pre-stretching at least one strength member; adhering the strength member to a laminant, holding the pre-stretched strength member in its elongated position wrapping the laminant about the fiber optic core.
According to a further broad aspect of the present invention there is provided a fiber optic cable comprising a fiber optic core including at least one optical fiber adapted to receive optical communication signals. At least one elastic strength member is provided parallel to the fiber optic core. The strength member is in a stretched condition. Means is also provided for maintaining the strength member in a stretched condition whereby the strength member is adapted to apply a force in the opposite direction to longitudinal stress forces on the cable for protecting the optical fiber from longitudinal stress.
According to a still further broad aspect of the present invention there is provided a method for providing longitudinal stress protection for a fiber optic cable. The method comprises the steps of provid-ing an optical fiber having a predetermined longitudinal break force, stretching at least one elastic strength member with a force e~ual to or greater than the break strength force of the optical fiber, applying at least one strength member to a laminant, securing the strength member to the laminant in its stretched condition with an adhesive, and circumscribing the optical fiber with ~ 4 -the at least one laminant.
BRIEF DESCRIPTION OF THE DRAWINGS
The subject matter which is regarded as the invention is set forth in the appended claims. The invention, however, together with further objects and advantages thereof may be better understood with reference to the following description taken in conjunc-tion with the accompanying drawings in which:
FIGURE 1 is a partial isometric view with portions removed, of a fiber optic cable having pre-stretched strength members in accordance with one form of this invention, FIGURE 2 is a sectional end view of the fiber optic cable shown in Figure 1, FIGURE 3 is a partial top view of the laminated pre-stretched strength members showing further aspects of this invention, FIGURE 4 is a sectional end view of the laminated fiber optic strength members shown in Figure 3.
DESCRIPTION_OF THE_PREFERRED EMBODIME~T
Referring now more particularly to Figure 1, there is provided fiber optic cable 1 shown with its structure partially removed in a staggered manner from the inner fiber to the outer jacket. Optical fiber 2 in this embodiment is made of a glass material. A
suitable glass optical fiber may be obtained from the Corning Glass Works or from other commercial sources.
Optical fiber 2 may be replaced by a bundle of optical fibers without departing from the spirit of the invention.
In this embodiment, optical fiber 2 is covered by a material 3 which protects the optical fiber from abrasion and also from external forces in the perpendicular - 4a -direction to the horizontal axis of fiber 2. Protection member 3 may be made from many materials such as plastics including polyvinylchloride. The protection member may be extruded over the optical fiber.
Sheath 6 may be extruded over the top of the core 7, also providing protection for the core. This sheath may be made from a synthetic resin such as poly-urethane. Laminant 4 acts as a carrier for a plurality of optical strength members 5 and may be made of various materials such as polyester. The strength members may be made of various elastic materials such as Kevlar*, nylon or polyester. Since these types of strength members may be elongated by a force less than the force required to break the glass fiber, the strength members 5 are stretched prior to their use. An adhesive coating 8 is placed on the top side of laminant 4 for adhering the stretched strength members to the laminant, and also for holding the strength members in their pre-stretched position.
As can be seen from Figure 2, the strength members 5 are placed symmetrically about the cable core by wrapping the laminant 4 thereabout and the restrain-ing forces applied by the strength members are relatively even about the core to prevent bending of the fiber. The relationship between the laminant 4, the strength member 5, and the adhesive coating 8 may be more clearly seen with reference to Figure 4.
Figure 4 shows an end cross-sectional view of the laminant 4 having the strength members attached thereto prior to *Registered Trade Mark of DuPont Company it being wra~ed about the cable core. As can be seen from Fiqure 4, there is ~rovided a thin layer of adhesive 8 in which the strenqth ~embers 5 are embedde~. Adhesive may be anv ~ressure-sensitive or heat-sensitive adhesive such as an e~oxy resin of sufficient strenqth to hold a strength member such 2S
Kevlar in a nre-stretched ~osition of at least ~rom 7 x l Pounds oer s~uare inch to 19 x 106 ~ounds ~er square inch pressure de~en~ing on the break strength of the oPtical fiber and the desired Protection level. A second laminant (not shown) with accompanying adhesive, like laminant 4 and adhesive 8, could be a~Plied to the other side of the strenqth members without fle~artin~ from the soirit of the invention.
,~ The cable shown in Figure 1 may be manufactured in the ¦Ifollowinq manner:
An o~tical fiber 2 or ~iber bundle is ~rovided.
Polyvinylchloride ~rotection member 3 may be extruded over the fiber. ~he force reauire~ to break the fiber in its lonqitudinal direction is measured or calculated. A ~luralitY of ~evlar stren~th members are stretched so as to a~P~lY a force in the on~osite ~irection to the calculated break force of the oPtical fiber. In the ~referred embodiment this stretch orce will be aP~roximately equal to the calculated break force of the optical fiber. ~ormally, the strength members will ~e stretched to a point where they will elonqate less than 1~ more.
The stretched strength members are symetricallY aPDlied to a tape comDrising a laminate with adhesive on one side. The adhesive should be stron~ enou~h to hold the strength member in their stretched condition. The strength members ~ay be-sandwiched between a Pair of such tapes to insure that they are held in their stretched condition.
The laminated strenqth members are ~laced around the core containin~ the oDtical fiber or fibers. ~ synthetic resin Drotective sheath may then be extruded over the laminated ~.C~ g9 strength members.
From the fore~oinq descriotion of the ~referred embodiment of the invention, it ~ould be a~Darent that many modifications may ~e made therein. It will ke understood, therefore, that this embodiment is intended as an exem~lification only and that the invention is not limited thereto. It is to be understood, therefore, that it is intended that the pendinq claims cover all such modifications that shall fall within the true spirit and scope of the invention.
Claims (11)
1. A fiber optic cable comprising:
a fiber optic core including at least one optical fiber adapted to receive optical communication signals;
at least one elastic strength member parallel to said fiber optic core; said strength member being in a stretched condition;
means for maintaining said strength member in a stretched condition whereby said strength member is adapted to apply a force in the opposite direction to longitudinal stress forces on said cable for protecting said optical fiber from longitudinal stress.
a fiber optic core including at least one optical fiber adapted to receive optical communication signals;
at least one elastic strength member parallel to said fiber optic core; said strength member being in a stretched condition;
means for maintaining said strength member in a stretched condition whereby said strength member is adapted to apply a force in the opposite direction to longitudinal stress forces on said cable for protecting said optical fiber from longitudinal stress.
2. A cable as set forth in claim 1 further includ-ing a plurality of elastic strength members parallel to said fiber optic core.
3. A cable as set forth in claim 2 wherein said plurality of elastic strength members are adhered to and supported by at least one laminant, said laminant includ-ing an adhesive on one side thereof for holding said elastic strength members in said stretched condition.
4. A cable as set forth in claim 3 wherein said plurality of elastic strength members are substantially evenly spaced from one another.
5. A cable as set forth in claim 1 wherein said manner for maintaining includes at least one laminant and an adhesive on one side of said laminant; said laminant at least one elastic strength member being secured to said laminant by said adhesive.
6. A cable as set forth in claim 1 wherein said at least one elastic strength member is taken from the group consisting of Kevlar*, nylon and polyester.
7. A cable as set forth in claim 1 wherein said at least one elastic strength member has a tensile modulus in the range of .7x106 pounds per square inch to 19x106 pounds per square inch.
8. A cable as set forth in claim 1 wherein said at least one elastic strength member will not substan-tially elongate under forces equal to the break strength of the fiber optic.
9. A cable as set forth in claim 1 wherein said at least one strength member is laminated between a pair of tapes.
10. A method for providing longitudinal stress protection for a fiber optic cable comprising the steps of:
providing an optical fiber having a predeter-mined longitudinal break force; stretching at least one elastic strength member with a force equal to or greater than the break strength force of said optical fiber;
applying at least one strength member to a laminant; securing said strength member to said laminant in its stretched condition with an adhesive;
circumscribing said optical fiber with said at least one laminant.
providing an optical fiber having a predeter-mined longitudinal break force; stretching at least one elastic strength member with a force equal to or greater than the break strength force of said optical fiber;
applying at least one strength member to a laminant; securing said strength member to said laminant in its stretched condition with an adhesive;
circumscribing said optical fiber with said at least one laminant.
11. The method of making the cable as set forth in claim 10 further including the step of extruding a sheath over said laminant.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US882,832 | 1978-03-02 | ||
| US05/882,832 US4169657A (en) | 1978-03-02 | 1978-03-02 | Laminated strength members for fiber optic cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1110889A true CA1110889A (en) | 1981-10-20 |
Family
ID=25381428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA322,493A Expired CA1110889A (en) | 1978-03-02 | 1979-02-28 | Laminated strength members for fiber optic cable |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4169657A (en) |
| CA (1) | CA1110889A (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4331378A (en) * | 1976-10-22 | 1982-05-25 | E. I. Du Pont De Nemours And Company | Reinforced optical fiber cable with glass or silica core |
| USRE32436E (en) * | 1976-10-22 | 1987-06-09 | Mitsubishi Rayon Co., Ltd. | Reinforced optical fiber cable with glass or silica core |
| US4241979A (en) * | 1979-01-18 | 1980-12-30 | Bell Telephone Laboratories, Incorporated | Optical communication cable with means for controlling coupling between cable jacket and strength members |
| CA1131953A (en) * | 1979-06-01 | 1982-09-21 | Zoltan Zongor | Optical fibre transmission cable reinforcement |
| NL7908966A (en) * | 1979-12-13 | 1981-07-16 | Philips Nv | OPTICAL TELECOMMUNICATIONS ELEMENT, METHOD FOR MANUFACTURING IT AND OPTICAL TELECOMMUNICATIONS CABLE FITTED WITH THE ELEMENT. |
| NL8000382A (en) * | 1980-01-22 | 1981-08-17 | Philips Nv | OPTICALLY CONDUCTIVE ELEMENT, METHOD FOR MANUFACTURING IT, DEVICE FOR MANUFACTURING SUCH AN ELEMENT AND OPTICAL TELECOMMUNICATION CABLE INCLUDING SUCH ELEMENT. |
| NL8001832A (en) * | 1980-03-28 | 1981-10-16 | Philips Nv | OPTICAL TELECOMMUNICATIONS ELEMENT. |
| US4763981A (en) * | 1981-03-02 | 1988-08-16 | The United States Of America As Represented By The Secretary Of The Navy | Ultimate low-loss electro-optical cable |
| US4441787A (en) * | 1981-04-29 | 1984-04-10 | Cooper Industries, Inc. | Fiber optic cable and method of manufacture |
| FR2525349A1 (en) * | 1982-04-16 | 1983-10-21 | Fiberglas Canada Inc | Optical fibre cable with fibre resin reinforcement - the reinforcement being under tension to ensure all force on the optical fibre is absorbed |
| KR900002554B1 (en) * | 1982-07-05 | 1990-04-20 | 후루까와 덴끼 고오교오 가부시끼가이샤 | Coated optical fiber |
| US4515435A (en) * | 1982-08-10 | 1985-05-07 | Cooper Industries, Inc. | Thermally stabilized fiber optic cable |
| US4552432A (en) * | 1983-04-21 | 1985-11-12 | Cooper Industries, Inc. | Hybrid cable |
| DE3328948C2 (en) * | 1983-08-11 | 1986-09-25 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Process for the production of electrical and / or optical cables |
| US4743085A (en) * | 1986-05-28 | 1988-05-10 | American Telephone And Telegraph Co., At&T Bell Laboratories | Optical fiber cable having non-metallic sheath system |
| US4852964A (en) * | 1987-03-04 | 1989-08-01 | Storm Products Co. | Fiber optic coil cord |
| US5463706A (en) * | 1994-02-16 | 1995-10-31 | Thomas & Betts Corporation | Light traceable transmission conduit assembly |
| FR2728694B1 (en) * | 1994-12-22 | 1997-03-14 | France Telecom | MODULE FOR FIBER OPTIC CABLES, MANUFACTURING METHOD AND INSTALLATION THEREFOR |
| US5825958A (en) * | 1996-01-25 | 1998-10-20 | Pharos Optics, Inc. | Fiber optic delivery system for infrared lasers |
| US6400873B1 (en) | 2000-03-31 | 2002-06-04 | Corning Cable Systems Llc | Fiber optic cable having a strength member |
| RU2585655C2 (en) * | 2014-05-26 | 2016-06-10 | Закрытое акционерное общество "Геоптикс" | Cable for geophysical research horizontal and rising section of well |
| EP4239386A1 (en) * | 2022-02-09 | 2023-09-06 | Sterlite Technologies Limited | Optical fiber cable with elongated strength members and manufacturing method thereof |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1956963B2 (en) * | 1968-11-14 | 1971-11-18 | FLEXIBLE PROTECTIVE COVERING | |
| US3855897A (en) * | 1969-11-12 | 1974-12-24 | N Takahashi | Method of protecting a bundle of flexible optical fibers |
| US3813098A (en) * | 1970-06-22 | 1974-05-28 | H Fischer | Prestressed elements |
| GB1425928A (en) * | 1972-11-10 | 1976-02-25 | Bicc Ltd | Optical guides |
| US4009932A (en) * | 1974-05-10 | 1977-03-01 | Industrie Pirelli S.P.A. | Composite optical fiber element for telecommunication cables |
| US4093342A (en) * | 1974-11-12 | 1978-06-06 | International Standard Electric Corporation | Optical fiber cable |
| GB1486227A (en) * | 1974-12-05 | 1977-09-21 | Standard Telephones Cables Ltd | Optical fibre cable |
| AU498613B2 (en) * | 1974-12-24 | 1979-03-22 | Alcatel N.V. | Arrangement for optical fibre cables |
| US4113349A (en) * | 1975-07-30 | 1978-09-12 | Air Logistics Corporation | Fiber reinforced optical fiber cable |
| FR2319912A1 (en) * | 1975-08-01 | 1977-02-25 | Lignes Telegraph Telephon | Stress protection system for optical fibres - unites two tapes, one on either side of fibre, with less elongation for given load than fibre |
| US4138193A (en) * | 1977-09-27 | 1979-02-06 | General Cable Corporation | Multiple fiber laminate for optical waveguides |
-
1978
- 1978-03-02 US US05/882,832 patent/US4169657A/en not_active Expired - Lifetime
-
1979
- 1979-02-28 CA CA322,493A patent/CA1110889A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4169657A (en) | 1979-10-02 |
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