CA1096216A - Device for containing optical fibers and the like - Google Patents
Device for containing optical fibers and the likeInfo
- Publication number
- CA1096216A CA1096216A CA000323351A CA323351A CA1096216A CA 1096216 A CA1096216 A CA 1096216A CA 000323351 A CA000323351 A CA 000323351A CA 323351 A CA323351 A CA 323351A CA 1096216 A CA1096216 A CA 1096216A
- Authority
- CA
- Canada
- Prior art keywords
- optical fibers
- tray
- fiber
- organizing optical
- carrier
- 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 22
- 239000000835 fiber Substances 0.000 claims abstract description 54
- 238000005452 bending Methods 0.000 claims abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims 2
- 239000002991 molded plastic Substances 0.000 claims 1
- 230000008439 repair process Effects 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010959 steel 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
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
- G02B6/444—Systems or boxes with surplus lengths
- G02B6/4453—Cassettes
- G02B6/4454—Cassettes with splices
-
- 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
- G02B6/4439—Auxiliary devices
- G02B6/444—Systems or boxes with surplus lengths
- G02B6/4452—Distribution frames
- G02B6/44526—Panels or rackmounts covering a whole width of the frame or rack
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
Abstract of the Disclosure A device for organizing optical fibers and the like at splice or slack points is provided. The device comprises a plurality of stacked tray-like supports having partially turned-up edges, with each separately hinged at one side thereof to a carrier. Each tray-like support is adapted to retain a looped fiber portion without damage by having a width at least equal to twice the minimum bending radius specified for that fiber.
Description
~62~$i Field_ f the Invention The present invention relates to optical fibers in general and more particularly to the organizing of optical fibers at slack or splice points.
Background and Summary of the Invention The handling of optical fibers requires special care. This is particularly true in splice enclosures. Due to their size, which can be as small as 0.002" in diameter, the handling of fibers is a problem.
Transmission capabilities will be impaired if a fiber is bent beyond the permanent bending radius, the point at which light is no longer totally contained in the core of the fiber. Furthermore, fibers are brittle and will break if bent beyond the minimum bending radius. Unconventional methods for the handling and storage of fibers must therefore be devised. While glass and silica (the materials used to make optical fibers) are in some respects stronger than steel, fibers normally do not possess this potential strength because of microscopic surface fractures which are vulnerable to stress ancl spread, causing the fiber to break easily. Thus the take-up of fiber slack i'n a closure presents a problem for multi-fiber cables, where individual fiber splices are required to facilitate rearrangements and repairs. Another problem is that of identifying individua'l fibers. In large multi-fiber cables each fiber must be readily identifiable for subsequent testing and repairs. Unlike copper where the insulation may be colour coded, cod-ing is difficult with individual optical fibers.
In an attempt to mitigate these problems, a standard splice enclosure with a central transverse bulkhead was used. The individual fibers are spliced and are attached to the bulkhead for support. A disadvantage of this approach is that storage of slack in the fibers is not provided for. Furthermore~ each of the fibers must be individually tagged ~or identification purposes.
Another approach uses a ribbon type optical fiber arrangement where twelve fibers are fixed together side by side. Twelve of these r;bbons are then stacked one on top of another to obtain a cable containing 144 individual fibPrs. The fibers are bulk spliced using an epoxy technique and the cable is placed in a standard splice enclosure. Disadvantages of the above approach are the lack of access to individual fibers and, again, no slack storage. A single fiber failure is impossible to repair, and the fiber must be taken out o-f service.
In other splicing arrangements all the fibers in a cable are looped within the same retainer or fiber slack is stored on spools. In either case identification 5 repair or splice work of individual ~`ibers is extremely difficult without a major shuffle in the splice enclosure. This is undesirable as transmission capability can be affected in working fibers ac they are moved.
The present invention mitigates these problems by providing a device for organizing, segregating and protecting a plurality of individual optical fibers or other similar type conductors or fibers at a slack or splice point. Q device having modular construction is provided whic~h is suitable For installation in standard splice enclosures. The device comprises a pluralîty of tray-like members each adapted to ~362~6 retain and store the slack in at least one fiber. The device provides easy access to the individual fibers contained in the trays. Each tray is marked to identify individual fibers therein. The trays are stacked one on top of the other, and are each hinged separately at one side thereof to a carrier, thus allowing them to move relative to one another like bound pages. To provide additional capacity~ the carrier structure is extended by adding to it and more trays are then stacked.
Thus in accordance with the present invention there is provided a device for organizing optical fibers and the like including a plurali-ty o~ stacked tray-like supports, having at least partially turned up edges for retaining a looped fiber portion, separately h-inged at one side to a carrier and having a width at least equal to twice the minimum bending radius specified for that fiber.
Brief Description of the Drawings The preferred embodiment will now be described in conjunc~ion with the drawings in which:
Figure 1 is a perspective view of a device for organizing optical fibers in accordance with the invention;
Figure 2 is a top view of a tray oF the dev;ce of Figure l;
Figure 3 is a cross-sectional view along the line 3-3 of Figure 2;
Figure 4 is a side view of the base and support member assembly of the device of Figure l;
Figure 5 is a front view of the base and support post assembly of Figure 4~ and Figure 6 is a top view of the base and support member of Figure 4.
Description o~ the Preferred Embodiment The device for organizing optical fibers is modular in structure. Referring to Figure 1 of the draw-ings, the device comprises a plurality of stacked tray-like supports lOa t~ lOf (trays hereinafter) hinged at one side thereof to a carrier consisting of two ~ertical support nlembers 11 and 11' and two base end members 12 and 12'. The base end members 12 and 12' are held in spaced relationship by longitudinal base members 13 and 13'.
A retainer bar 14 maintains fibers 15a to l5F in close proximity to said vertical members. In order to expand the capacity, additional vertical support members 1~ and 16' are placed on top of vertical support members 11 and 11' and trays are stacked in.
A typical tray lOa, as best illustrated in Figures 2 and 3, is a generally flat rectangular piece with partially turned up edges to form a fiber re~aining lip 20 at the periphery of tray lOa. Spaces 21 and 21' are left on either end of tray 10 for insertion of the fiber 15a.
The fiber 15a is looped around the tray lOa and held therein by the retaining lip 20. A pair of hinging pins 22 extend from the rearward retaining lip 20a beyond the ends of the tray lOa and cooperate with the vertical support members 11 and lla. Pins 22 may be disposed under the retaining lip 20a or an integral part of the tray lOa.
The size of the tray lOa is dependent on the minimum bending radius of the fiber 15a. The tray lOa must be wider th3n twice the minimum bending radius in order to avoid damaging or breaking the fiber 15. As well to avoid impairrnent to the transmission capabili-ties of the ~62~
fiber the tray lOa is preferably at least as wide as twice the permanent bending radius. The width of twice the permanent bending radius has been found preferable as it allows a reasonable safety margin, in handling the fibers and keeps the trays as narrow as possible. The length of the tray lOa is dependent on the amount of storage of slack required. In the front edge of each tray lOa there is at least one cut-out 23 in the retaining lip 20 - provided for access to the fiber 15a to facilitate removal. If the tray lOa is used for splice storage the splice 2~ would usually be disposed under the front retaining lip 20.
As illustrated in Figures 4, 5 and 6, the vertical support mèmber 11 engages base end member 12 in a releasable dovetail joint 25. Base members 12 and 12' are held in appropriate spaced relationship by longitudinal base members 13 and 13'. The top of vertical support members 11 and 11' and 16 and 16' are formed in a female dovetail 26 with the bottom of vertical support members 11 and 11' and 16 and 16' formed in a male dovetail 27 allowing vertical support members 11 and 16 and 11' and 16' to be stacked. The vertical support member 11 has a generally rectangular cross-section with an end to end groove 28 cut into its inner side to accept pins 22. A
small hole 29 is drilled the length of the vertical support member 11 and 11' and 16 and 16' to accept retaining pin 30 which holds vertical support members 11 and 16 and 11' and 16' respectively from sliding apart when they are stacked. Vertical support members 11 and 16 and 11' and 16' are identical. Top caps 31 each have a male dovetail bottom 27 which mates with the female dovetail 26 on the top of vertical support members 11 and 11' or 16 and 16'.
z~
The top cap 31 holds the pins 22 in place. The hole 29 is also drilled through the top cap 31 to accept retaining pin 30. Retainer bars 14 and 14' are L-shaped members pivotally attached to the outside of base members 12 and 12' respectively and can be releasably pinned to the top cap 31 by pin 32. The retainer bars 14 and 14' can be pivoted out of the way when installation or repairs are being made.
During installation the base members 12 and 12' and 13 and 13' and the vertical support members 11 and 11' are placed in position. A first tray 10f is put in place by sliding the ends of the pins 22 down the groove 28 in the vertical support members 11 and 11'. The fiber 15f is spliced if necessary and installed in a loop around the tray lOf. A second tray lOe is put in place and the fiber 15e installed. This procedure continues until all trays lOa to lOf and fibers 15a to 15f have been installed.
If necessary additional vertical support ~embers 16 and 16' can be used to increase the capacity of the system.
Once all trays lOa to lOf are installed the top caps 31 are put in place, retaining pins 30 inserted and fiber retainers 14 and 14' installed.
For repair, the fiber retainers 14 and 14' are pivoted away, the necessary tray (say tray lOd) is located and the trays lOa, lOb and IOc above are hinged out of the way on pins 22. Easy access is now available to the appropriate fiber 15d. Once repairs are made the trays 10a, lOb and lOc are replaced in their normal position and the fiber retainers l4 and 14' are pivoted back into position.
The trays are preferably made of aluminum or a molded thermosetting plastic. The vertical support members are preferably thermosetting plastic.
Background and Summary of the Invention The handling of optical fibers requires special care. This is particularly true in splice enclosures. Due to their size, which can be as small as 0.002" in diameter, the handling of fibers is a problem.
Transmission capabilities will be impaired if a fiber is bent beyond the permanent bending radius, the point at which light is no longer totally contained in the core of the fiber. Furthermore, fibers are brittle and will break if bent beyond the minimum bending radius. Unconventional methods for the handling and storage of fibers must therefore be devised. While glass and silica (the materials used to make optical fibers) are in some respects stronger than steel, fibers normally do not possess this potential strength because of microscopic surface fractures which are vulnerable to stress ancl spread, causing the fiber to break easily. Thus the take-up of fiber slack i'n a closure presents a problem for multi-fiber cables, where individual fiber splices are required to facilitate rearrangements and repairs. Another problem is that of identifying individua'l fibers. In large multi-fiber cables each fiber must be readily identifiable for subsequent testing and repairs. Unlike copper where the insulation may be colour coded, cod-ing is difficult with individual optical fibers.
In an attempt to mitigate these problems, a standard splice enclosure with a central transverse bulkhead was used. The individual fibers are spliced and are attached to the bulkhead for support. A disadvantage of this approach is that storage of slack in the fibers is not provided for. Furthermore~ each of the fibers must be individually tagged ~or identification purposes.
Another approach uses a ribbon type optical fiber arrangement where twelve fibers are fixed together side by side. Twelve of these r;bbons are then stacked one on top of another to obtain a cable containing 144 individual fibPrs. The fibers are bulk spliced using an epoxy technique and the cable is placed in a standard splice enclosure. Disadvantages of the above approach are the lack of access to individual fibers and, again, no slack storage. A single fiber failure is impossible to repair, and the fiber must be taken out o-f service.
In other splicing arrangements all the fibers in a cable are looped within the same retainer or fiber slack is stored on spools. In either case identification 5 repair or splice work of individual ~`ibers is extremely difficult without a major shuffle in the splice enclosure. This is undesirable as transmission capability can be affected in working fibers ac they are moved.
The present invention mitigates these problems by providing a device for organizing, segregating and protecting a plurality of individual optical fibers or other similar type conductors or fibers at a slack or splice point. Q device having modular construction is provided whic~h is suitable For installation in standard splice enclosures. The device comprises a pluralîty of tray-like members each adapted to ~362~6 retain and store the slack in at least one fiber. The device provides easy access to the individual fibers contained in the trays. Each tray is marked to identify individual fibers therein. The trays are stacked one on top of the other, and are each hinged separately at one side thereof to a carrier, thus allowing them to move relative to one another like bound pages. To provide additional capacity~ the carrier structure is extended by adding to it and more trays are then stacked.
Thus in accordance with the present invention there is provided a device for organizing optical fibers and the like including a plurali-ty o~ stacked tray-like supports, having at least partially turned up edges for retaining a looped fiber portion, separately h-inged at one side to a carrier and having a width at least equal to twice the minimum bending radius specified for that fiber.
Brief Description of the Drawings The preferred embodiment will now be described in conjunc~ion with the drawings in which:
Figure 1 is a perspective view of a device for organizing optical fibers in accordance with the invention;
Figure 2 is a top view of a tray oF the dev;ce of Figure l;
Figure 3 is a cross-sectional view along the line 3-3 of Figure 2;
Figure 4 is a side view of the base and support member assembly of the device of Figure l;
Figure 5 is a front view of the base and support post assembly of Figure 4~ and Figure 6 is a top view of the base and support member of Figure 4.
Description o~ the Preferred Embodiment The device for organizing optical fibers is modular in structure. Referring to Figure 1 of the draw-ings, the device comprises a plurality of stacked tray-like supports lOa t~ lOf (trays hereinafter) hinged at one side thereof to a carrier consisting of two ~ertical support nlembers 11 and 11' and two base end members 12 and 12'. The base end members 12 and 12' are held in spaced relationship by longitudinal base members 13 and 13'.
A retainer bar 14 maintains fibers 15a to l5F in close proximity to said vertical members. In order to expand the capacity, additional vertical support members 1~ and 16' are placed on top of vertical support members 11 and 11' and trays are stacked in.
A typical tray lOa, as best illustrated in Figures 2 and 3, is a generally flat rectangular piece with partially turned up edges to form a fiber re~aining lip 20 at the periphery of tray lOa. Spaces 21 and 21' are left on either end of tray 10 for insertion of the fiber 15a.
The fiber 15a is looped around the tray lOa and held therein by the retaining lip 20. A pair of hinging pins 22 extend from the rearward retaining lip 20a beyond the ends of the tray lOa and cooperate with the vertical support members 11 and lla. Pins 22 may be disposed under the retaining lip 20a or an integral part of the tray lOa.
The size of the tray lOa is dependent on the minimum bending radius of the fiber 15a. The tray lOa must be wider th3n twice the minimum bending radius in order to avoid damaging or breaking the fiber 15. As well to avoid impairrnent to the transmission capabili-ties of the ~62~
fiber the tray lOa is preferably at least as wide as twice the permanent bending radius. The width of twice the permanent bending radius has been found preferable as it allows a reasonable safety margin, in handling the fibers and keeps the trays as narrow as possible. The length of the tray lOa is dependent on the amount of storage of slack required. In the front edge of each tray lOa there is at least one cut-out 23 in the retaining lip 20 - provided for access to the fiber 15a to facilitate removal. If the tray lOa is used for splice storage the splice 2~ would usually be disposed under the front retaining lip 20.
As illustrated in Figures 4, 5 and 6, the vertical support mèmber 11 engages base end member 12 in a releasable dovetail joint 25. Base members 12 and 12' are held in appropriate spaced relationship by longitudinal base members 13 and 13'. The top of vertical support members 11 and 11' and 16 and 16' are formed in a female dovetail 26 with the bottom of vertical support members 11 and 11' and 16 and 16' formed in a male dovetail 27 allowing vertical support members 11 and 16 and 11' and 16' to be stacked. The vertical support member 11 has a generally rectangular cross-section with an end to end groove 28 cut into its inner side to accept pins 22. A
small hole 29 is drilled the length of the vertical support member 11 and 11' and 16 and 16' to accept retaining pin 30 which holds vertical support members 11 and 16 and 11' and 16' respectively from sliding apart when they are stacked. Vertical support members 11 and 16 and 11' and 16' are identical. Top caps 31 each have a male dovetail bottom 27 which mates with the female dovetail 26 on the top of vertical support members 11 and 11' or 16 and 16'.
z~
The top cap 31 holds the pins 22 in place. The hole 29 is also drilled through the top cap 31 to accept retaining pin 30. Retainer bars 14 and 14' are L-shaped members pivotally attached to the outside of base members 12 and 12' respectively and can be releasably pinned to the top cap 31 by pin 32. The retainer bars 14 and 14' can be pivoted out of the way when installation or repairs are being made.
During installation the base members 12 and 12' and 13 and 13' and the vertical support members 11 and 11' are placed in position. A first tray 10f is put in place by sliding the ends of the pins 22 down the groove 28 in the vertical support members 11 and 11'. The fiber 15f is spliced if necessary and installed in a loop around the tray lOf. A second tray lOe is put in place and the fiber 15e installed. This procedure continues until all trays lOa to lOf and fibers 15a to 15f have been installed.
If necessary additional vertical support ~embers 16 and 16' can be used to increase the capacity of the system.
Once all trays lOa to lOf are installed the top caps 31 are put in place, retaining pins 30 inserted and fiber retainers 14 and 14' installed.
For repair, the fiber retainers 14 and 14' are pivoted away, the necessary tray (say tray lOd) is located and the trays lOa, lOb and IOc above are hinged out of the way on pins 22. Easy access is now available to the appropriate fiber 15d. Once repairs are made the trays 10a, lOb and lOc are replaced in their normal position and the fiber retainers l4 and 14' are pivoted back into position.
The trays are preferably made of aluminum or a molded thermosetting plastic. The vertical support members are preferably thermosetting plastic.
Claims (10)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS
FOLLOWS:
1. A device for organizing optical fibers and the like comprising a plurality of stacked tray-like supports having partially turned-up edges for retaining a looped fiber portion, each tray-like support separately hinged to a carrier and having a width at least equal to twice the minimum bending radius specified for that fiber.
2. A device for organizing optical fibers and the like as claimed in claim 1 wherein said tray-like support width is equal to at least twice the permanent bending radius specified for said fiber.
3. A device for organizing optical fibers and the like as claimed in claim 2, wherein said tray-like supports have two openings in said turned-up edges for entry and exit of said fiber thereonto and at least one further opening in said edge providing access to said fiber.
4. A device for organizing optical fibers and the like as claimed in claim 3, said tray-like supports having protruding hinging pins along one edge thereof.
5. A device for organizing optical fibers and the like as claimed in claim 4 said carrier comprising two vertical members with vertical grooves therein for receiving said hinging pins.
6. A device for organizing optical fibers and the like as claimed in claim 5, said carrier further comprising a pair of retaining bars for maintaining ingoing and outgoing fibers in close proximity to said vertical members.
7. A device for organizing optical fibers and the like as claimed in claim 5 wherein said tray-like supports are made of aluminum.
8. A device for organizing optical fibers and the like as claimed in claim 7 wherein said carrier is made from plastic.
9. A device for organizing optical fibers and the like as claimed in claim 5 wherein said tray-like support is made of molded plastic.
10. A device for organizing optical fibers and the like as claimed in claim 9 wherein said carrier is made from plastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000323351A CA1096216A (en) | 1979-03-13 | 1979-03-13 | Device for containing optical fibers and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000323351A CA1096216A (en) | 1979-03-13 | 1979-03-13 | Device for containing optical fibers and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1096216A true CA1096216A (en) | 1981-02-24 |
Family
ID=4113735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000323351A Expired CA1096216A (en) | 1979-03-13 | 1979-03-13 | Device for containing optical fibers and the like |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1096216A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2573544A1 (en) * | 1984-11-20 | 1986-05-23 | Mars Alcatel | FIBER OPTIC CONNECTION SUPPORT |
| WO1989005989A1 (en) * | 1987-12-23 | 1989-06-29 | British Telecommunications Public Limited Company | Mounting assembly for optical equipment |
-
1979
- 1979-03-13 CA CA000323351A patent/CA1096216A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2573544A1 (en) * | 1984-11-20 | 1986-05-23 | Mars Alcatel | FIBER OPTIC CONNECTION SUPPORT |
| EP0185923A1 (en) * | 1984-11-20 | 1986-07-02 | MARS-ACTEL Société Anonyme dite: | Support for optical-fibre connections |
| US4722585A (en) * | 1984-11-20 | 1988-02-02 | Mars Alcatel | Optical fiber connection support |
| WO1989005989A1 (en) * | 1987-12-23 | 1989-06-29 | British Telecommunications Public Limited Company | Mounting assembly for optical equipment |
| AU616467B2 (en) * | 1987-12-23 | 1991-10-31 | British Telecommunications Public Limited Company | Mounting assembly for optical equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |