CA2114339A1 - Case for passive optical components - Google Patents

Case for passive optical components

Info

Publication number
CA2114339A1
CA2114339A1 CA002114339A CA2114339A CA2114339A1 CA 2114339 A1 CA2114339 A1 CA 2114339A1 CA 002114339 A CA002114339 A CA 002114339A CA 2114339 A CA2114339 A CA 2114339A CA 2114339 A1 CA2114339 A1 CA 2114339A1
Authority
CA
Canada
Prior art keywords
case
case according
splices
glass fibres
portions
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.)
Abandoned
Application number
CA002114339A
Other languages
French (fr)
Inventor
Peter Grugel
Paul Oehlkers
Susanne Bernhardt
Martin Strus
Dietrich Rund
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ADC GmbH
Original Assignee
Krone GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Krone GmbH filed Critical Krone GmbH
Publication of CA2114339A1 publication Critical patent/CA2114339A1/en
Abandoned legal-status Critical Current

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
    • G02B6/4439—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
    • 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
    • G02B6/44524—Distribution frames with frame parts or auxiliary devices mounted on the frame and collectively not 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 case for passive optical components, such as glass fibres, couplers and splices, permits reception of couplers and splices while maintaining common mounting dimensions, and guarantees a clear, service-friendly and safe guiding of glass fibres while maintaining minimum bending radii. One front side of a lower case portion is provided with strain-relieved individual guide portions for the glass fibres and an S-shaped groove is integrated in the case bottom. Receiving portions for couplers and for splices are formed by guide portions connected with the bottom. Between the side walls and the receiving portions are provided fibre guide channels for achieving the required reserve lengths. In the area of the receiving portions, transversely to the parallel guiding portion of the couplers and of the splices, are included through-passing lift-off openings in the case bottom.

Description

2 ~ 3~

The present invention relates to a case for passive optical components, such as glass fibres, couplers and splices.
A receiving portion for the splice connections of a light waveguide cable is known in the art from DE 34 13 401 A1. Such receiving portion is formed by a box-type, upwardly open, flat case, provided, at one front side close to the side walls, with inlets for the cables and at the open cover side with lug-type holding-down devices projecting inwardly from the side walls. Centrally at the bottom is disposed a support portion carrying a leaf-type holding-down device. Further, a splice holder is attached at the bottom into which the individual splice positions are seguentially laid down. The leaf-type holding-down device covers the section of the splice holder. For stacking the cases, cams project from the case at the corners and engage into respective corner portions of the upwardly open case.
It is disadvantageous, in this prior art case~
that the glass fibres can only be introduced into the case bundled as light waveguide cables. Strain relief of the individual fibres is unreliable within the bundle. Guiding of the glass fibres in the case is not always guaranteed and is insufficiently secured at the side walls.
It is therefore an object of the invention to develop a case of the type referred to hereinbefore which permits a reception for couplers and splices while maintaining the common mounting dimensions, and which guarantees a clear, service-friendly and safe guiding of the glass fibres while maintaining the minimum bending radii.
Accordingly, the invention provides a case for passive optical components, said case comprising side walls, a bottom, front surfaces with through-passages, holding-down devices, passages in the bottom section and receiving portions, there being provided strain-relieved individual guide portions for glass fibres on the front side of the case and an S-shaped groove integrated in the case bottom, the receiving portions for couplers and for ' ' ~ ;; .~ , .......................... . .

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splices being formed by guide portions connected with the bottom.
The chosen configuration of the receiving portions for couplers and splices in the central section of the lower case portion in conjunction with the comb-type individual entries and exits at the front side of the lower case portion as well as in conjunction with the spatial distribution of the lower case portion permits a variable configuration with different couplers and splices.
The disposal of an S-type groove permits guiding in and out of all glass fibres through the individual exits. By the two-side arrangement of bottom passages at the front sides and the flattening thereof, guiding of a glass fibre is possible in different winding directions, corresponding to the respective requirements, while maintaining the minimum bending radii. The dimensions and the structura of the section behind the entrie~ and exits for the glass ibres is o~ importanae for meeting the requirements wlth re~pect to the minimum bending radii.
The outside case dimensions are selected so that they meet the common mounting conditions and environmental requirements, for instance adjusting the maximum width to the dimensions for integration in common assembly carriers of the data communication (for instance 19" racks). The entries and exits for the glass fibres are configured such that each glass fibre can individually be guided in and out and strain relieved as well as marked.
Thereby is achieved a higher consistency of strain relief than for a bundle introduction and the strain relief thereof. Strain relief is given by the conical design of the comb-type entries and exits with an introduction slot being slightly wider in the introduction section than the diameter of the glass fibre to be introduced. If the entries and exits are provided as separate components in the front side of the lower case portion, a slot shape adapted to the respectively e~ployed glass fibres is possible.

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3 ~ 9 By the arrangement of lift-of openings in the -bottom section of the lower case portion transversely to the parallely guided receiving portions for the couplers and splices, individual couplers and/or splices can be remov~d in case of servicing.
The arrangement of a surrounding step at the bottom and a web at the upper side of the lower case portion permit a stacking of lower case portions, wherein the individual lower case portions are fixed and the constructional height is reduced. The cover rests positively and flush on the lower case portion and does not cause an additional constructional height.
Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a top view of a lower case portion of a aase for passive optical components;
Figure 2 i5 a bottom view of the bottom of the lower case portion;
20Figure 3 is a side view of the lower case portion in the entry section;
Figure 4 is a sectional representation o~ the lower case portion along line A-F of Figure 1;
Figure 5 is a diagrammatical repre~entation of a coupler cascade 1 x 8;
Figure 6 is a top view of a lower case portion according to Figure 1 provided with components;
Figure 7 is a top view of another embodiment of lower case portion according to Figure 1 provided with components;
Figure 8 is a top view of a lower case portion with cover according to Figure 1 provided with components;
Figure 9 is a sectional representation of two stacked lower case portions with cover according to Figure 8; and Figure 10 is a side view of two stacked lower case portions according to Figure 8.

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_ 4 _ Referring now to the drawings, a case 1 for receiving passive optical components, such as glass fibres, couplers and splices, comprises a lower case portion 2 (Figures 1 and Z) and a cover 42 (Figures 8 and 9). The case 1 serves for protection of the connection positions (splice positions) and of the branches (coupler positions) of glass fibre cables and for reception of the required reserve lengths of glass fibres in con~unction with such positions. The case ~ has a modular design. Depending on the actual requirements, a different number of lower case portions 2 can be stacked in each other. Glass fibres 43 connecting the lower case portions 2 are each introduced through case bottoms 10 (Figure 7). The lower case portion 2 is provided with integrated receiving portions 12, 13 for 15 couplers 45 and splices 46 (Figures 6, 7), in particular sandwich splices. A variable configuration o~ the cases 1 with couplers 45 and splices 46 i~ possible (Figures 6, 7).
During 1nal a~sembly, the lower case portion 2 or several lower case portions 2 are screwed kogether with the cover 20 42 to form a case 1 or a case unit (Figures 8 to 10~.
Figure 1 shows a top view of the lower case portion 2. The lower case portion 2 includes a front entry section 3 with individual entries and exits 5, 6 for glass fibres integrated at front side 4 and with a holding-down device 49 above a botto~ passage 9 of the lower case portion 2, a central section 11 with receiving portions 12, 13 for the couplers 45 and the splices 46 and with a support portion 7, and a rear section 14 with curved wall portions 15 for guiding the glass fibres and with a holding-down device 16 being disposed above a bottom passage 17 of the lower case portion 2.
The individual entries 5 for the glass fibres consist, according to the embodiment of Figure 3, of four introduction slots 18 with inclined introduction portions 19 having a conical angle of 5. The width of the upper portion of the introduction slot is slightly larger than the diameter of the glass fibres to be introduced, so that the glass fibres are inserted strain-relieved over their ,: . .: . ~ . . . ~ : ,. , 2 ~ 3 ;~ ~

coatings. The elasticity of the glass fibre coating effects a reliable clamping action. The individual entries 5 are integrated in the front side 4 of the lower case portion 2. They can however also be separate components and mounted in the front side 4. In the same way, individual exits 6 are constructed here for eight glass fibres. The individual exits 6 are also used for the introduction of glass fibres, in conjunction with an S-shaped groove 20. If the glass fibres are introduced through the individual exits 6, the introduced glass fibre has to be brought by the S-shaped groove 20 into the same winding direction as the gla s fibres to be guided out.
The glass fibres guided in and out are then guided out through the individual exits 6.
The bottom passages 9 and 17 of the lower case portion 2 are flattened from above and below at opposite sides thereof, and are thus adapted for an optimum guiding of the glass fibres. For this purpose al~o, a trapezoidal guide portion 21 is formed in the front side 4 Por receiving and guiding the glass fibres and recesses 47, 48 are formed on the lower side of the bottom 10 (Figure 2).
In the entry section 3 of the lower case portion 2, before the receiving portions 12, 13, are provided markings 22 for the couplers 45 and the splices 46.
Figure 4 shows diagra~matically the construction of the central section 11. The central section 11 includes, in the centre, the support portion 7 with an S-shaped groove 20 and boreholes 23, 32 (Figure l) for securing the case 1 in the modular design, for fixing the cover and for fixing to an assembly carrier (not shown) or for adapting the case 1 to the installation environment.
The S-shaped groove 20 permits a change of direction for the entry fibre and thus a placing together of the glass fibres for the entries and exits in a common slot section, for instance according to Figure 7 in the area of the individual exit~ 6. The support portion 7 is integrated in the bottom 10 of the lower case portion 2. Adjacent the support portion 7 are formed eight guide grooves 24 : ' ' , ' . ~ :

3 ~ 9 representing the receiving portion 12 for eight couplers 45. Then follow a guide portion 25 for a splice 46 and a fibre guide channel 26 being limited by one side wall 27 and a limiting web 28 and being covered by two holding-down devices 8. The guide grooves 24 are interrupted by a surface 29 disposed transversely to the groove configuration, such surface 29 serving for applying adhesive material. The couplers 45 are safely ~ixed in the grooves 24 by means of an adhesive film. Also transversely lQ to the configuration of the grooves 24 are disposed, in the bottom 10 of the lower case portion 2, through-passing lift-off openings 30 above all grooves 24 in both groove sections, by means of which an easy disassembly of individual couplers 45 is possible. The guide portion 25 also comprises, for an easier removal of the splice 46 mounted therain, a lift-off opening 31 in the bottom 10 of the lower case portion 2.
On the other side of the support portion 1 fifteen guide grooves 33 form the receiving portion 13 for fifteen splices 46. Between the last guide groove 33 for the 15th splice 46 and a side wall 35 of the lower case portion 2 again a fibre guide channel 36 is disposed, being limited by a limiting web 37 (Figure 4) of the receiving portion 13 for the splices 46 and being covered by the two holding-down devices 8. Transversely to the direction of the guide grooves 33 is provided a lift-off opening 38 for removing individual splices 46 from the grooves 33. In a non-illustrated embodiment, a central supply channel for the glass fibres can be provided in the centre of the receiving portions 13 for the splices 46. In this case, two lift-off openings 38 would be provided, which are separated from each other by the supply channel. The supply channel serves for guiding the fibre to the exit 6 while observing the minimum bending radius.
According to Figure 1, the rear section 14 is limited by the curved wall portions 15 for guiding the fibre out of and into the receiving portions 12, 13. At front side 39 is formed the holding-down device 16 above , .
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3 ~ 9 the bottom passage 17. The bottom passage 17 is formed in the same way as the bottom passage 9 in the entry section 3. The bottom passage of the rear section 14 services for guiding out or in, respectively, glass fibres from another lower case portion (Figure 7).
According to Figures 1 and 2, the lower case portion 2 is provided at its upper side with a surrounding web 40 and at its lower side with a surrounding step 41 of identical dimensions, which engage into each oth~r when stacking a plurality of lower case portions 2 and thus guarantee a reliable fixation of the lower case portions 2 as well as a reduction in constructional height (Figures 9, 10).
In Figures 6 and 7 are shown top views of lower case portions 2 provided with components and with couplers 45 and splices 46, said lower case portions being stacked on each other, aacording to the sectional view shown in Figurc 9, and belng completed by the cover 42 to ~orm a coupler unit. Figure 8 shows the top view of such a coupler unit. Figure 7 shows the lower-side lower case portion 2 of the coupler unit according to Figure 10. In the case as shown, a glass fibre is introduced through the upper introduction slot 18 of the individual exits 6 into the lower portion 2 and is guided by the S-shaped groove 20 such that the winding direction changes and can also be guided out after the splice process through the individual exits 6. Thereby, the glass fibres can be guided on from the coupler case in a tight arrangement. As i5 shown in Figure 7, a glass fibre can be guided out from the bottom passage 17 and into the above lower case portion 2 according to Figure 6, and can be further spliced therein.
In the area of the splices 46, the glass fibres are fixed by means of holding-down devices 34. The holding-down devices 34 are formed of adhesive strips acting on the secondary envelopes oP the glass fibres placed between the splices 46 and guided parallely, and pressing them into the splices 46. The thickness of the adhesive strips is selected such that the space between the glass fibres and .

21 1~3~

a mounted cover 42 or another lower case portion 2 is filled. With temperature changes, the glass fibres can extend into the section following the splice section, while maintaining the mini~um bending radii (pistoning effect).
Figure 5 shows, as an example, the construction of a 1 x 8 coupler cascade for integration in the case 1.
A fibre 43 is transformed into eight fibres 43. For this purpose, the glass fibre 43 is branched i~to two fibres 43 in a first coupler 45. These two fibres 43 are each guided over one splice 46 again into one coupler 45 each, and are each branched therein into another two fibres 43, so that at this position, over the three couplers 45 and the two splices 46, four fibres 43 have already been branched.
These four fibres 43 are branched over four further splices 46 and four further couplers 45 into a total of eight fibres 43. Depending on the actual requirements, coupler units of 1 x 32 and lar~er can be achieved. For this construction, a total of four lower case portions 2 are stacked.

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Claims (21)

1. A case for passive optical components, said case comprising side walls, a bottom, front surfaces with through-passages, holding-down devices, passages in the bottom section and receiving portions, there being provided strain-relieved individual guide portions for glass fibres on the front side of the case and an S-shaped groove integrated in the case bottom, the receiving portions for couplers and for splices being formed by guide portions connected with the bottom.
2. A case according to claim 1, wherein fibre guide channels are provided between the receiving portions and the side walls and lift-off openings in the bottom are formed in the area of the receiving portions.
3. A case according to claim 1, wherein the individual guide portions comprise individual entries and individual exits and are provided with introduction slots of conical shape, so that their upper widths are slightly larger than the diameters of glass fibres to be guided in and out.
4. A case according to claim 3, wherein the angle of conicity of the introduction slots is from 4° to 7°.
5. A case according to claim 1, wherein the individual entries and exits are integrated in the front side of the case.
6. A case according to claim 1, wherein the individual entries and exits are separate components mounted in the front side of the case.
7. A case according to claim 1, wherein at least one guide portion for another splice is disposed between the receiving portion for the couplers and the fibre guide channel.
8. A case according to claim 7, a lift-off opening is disposed in the bottom section of the guide portion.
9. A case according to claim 2, wherein the fibre guide channels are covered by holding-down devices formed in the side walls.
10. A case according to claim 1, wherein the guide portions are interrupted by a surface in the area of the receiving portion for the couplers.
11. A case according to claim 1, wherein markings for the guide portions are provided in the bottom section of the receiving portions.
12. A case according to claim 1, wherein the bottom passages comprise opposed recesses for guiding fibres in and out.
13. A case according to claim 1, wherein a surrounding step is integrated at the lower side of the bottom of the case.
14. A case according to claim 1, wherein a surrounding web is provided at the upper side of the walls.
15. A case according to claim 1, wherein a cover is provided which positively and flushly terminates with the upper edge of the lower case portion.
16. A case according to claim 1, wherein holding-down devices are provided above the couplers and the splices.
17. A case according to claim 15, wherein the lower case portions are stackable.
18. A case according to claim 1, wherein a central guide channel for guiding the glass fibres to the individual exits is provided in the receiving portion for the splices.
19. A case according to claim 1, wherein the glass fibres to be guided in and out are separately or together located in individual guide portions.
20. A case according to claim 15, wherein a borehole is provided in a support portion integrated in the case bottom for screwing the cases to each other in a modular design without using the cover.
21. A case according to claim 16, wherein the holding-down devices rest on the outer envelope of the glass fibres parallely guided between the splices, so that a longitudinal extension between the primary and secondary envelopes of the glass fibres is possible (pistoning effect).
CA002114339A 1993-01-28 1994-01-27 Case for passive optical components Abandoned CA2114339A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4302837.3 1993-01-28
DE4302837A DE4302837A1 (en) 1993-01-28 1993-01-28 Housing for passive optical components

Publications (1)

Publication Number Publication Date
CA2114339A1 true CA2114339A1 (en) 1994-07-29

Family

ID=6479413

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002114339A Abandoned CA2114339A1 (en) 1993-01-28 1994-01-27 Case for passive optical components

Country Status (10)

Country Link
US (1) US5420956A (en)
EP (1) EP0608517A1 (en)
JP (1) JPH06281820A (en)
KR (1) KR940018677A (en)
CN (1) CN1092874A (en)
AU (1) AU5259393A (en)
BR (1) BR9400363A (en)
CA (1) CA2114339A1 (en)
DE (1) DE4302837A1 (en)
MX (1) MX9307700A (en)

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EP0608517A1 (en) 1994-08-03
JPH06281820A (en) 1994-10-07
US5420956A (en) 1995-05-30
BR9400363A (en) 1994-08-16
KR940018677A (en) 1994-08-18
AU5259393A (en) 1994-08-04
MX9307700A (en) 1994-08-31
DE4302837A1 (en) 1994-08-18
CN1092874A (en) 1994-09-28

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