OPTICAL FIBER CONNECTION SYSTEM INCLUDING OPTICAL FIBER ALIGNMENT DEVICE

Abstract

A self-centering structure (300) for aligning optical fibers (308) desired to be optically coupled together is disclosed. The self-centering structure (300) including a body (310) having a first end (312) and a second end (314). The first end (312) defines a first opening (303) and the second end (314) defines a second opening (304). The self-centering structure (300) includes a plurality of groove structures (306) integrally formed in the body (310) of the self-centering structure for receiving the optical fibers (308) and a fiber alignment region (305) positioned at an intermediate location between the first and second ends (312, 314) to facilitate centering and alignment of the optical fibers (308). The plurality of cantilever members (322) is flexible and configured for urging the optical fibers (308) into their respective groove structures (306).

Claims

1. (canceled)

2. An optical fiber alignment device comprising: at least first and second parts that fit together to form a fiber alignment unit, the first part defining a plurality of parallel grooves sized for receiving optical fibers, the second part including a plurality of elastic beams for generating biasing forces for pressing the optical fibers into the grooves.

3. The optical fiber alignment device of claim 2, wherein the elastic beams are parallel to the grooves.

4. The optical fiber alignment device of claim 2, wherein the grooves are V-grooves.

5. The optical fiber alignment device of claim 2, wherein the first and second parts are press-fit together.

6. The optical fiber alignment device of claim 2, wherein each of the elastic beams corresponds to only one of the grooves.

7. The optical fiber alignment device of claim 2, wherein at least portions of the elastic beams angle toward the grooves.

8. The optical fiber alignment device of claim 2, wherein the elastic beams have lengths that extend along lengths of the grooves.

9. The optical fiber alignment device of claim 2, wherein the elastic beams includes projections that extend from bodies of the elastic beams toward the grooves.

10. A fiber alignment assembly comprising: a first structure defining a plurality of grooves for receiving a plurality of optical fibers; and a second structure including first and second sets of elastic beams for generating biasing forces for pressing the plurality of optical fibers into the plurality of grooves; wherein the first and second sets of elastic beams have free ends and base ends, the base ends being unitarily formed with the second structure; and wherein the first and second sets of elastic beams are oriented in opposite directions with the free ends of the first set of elastic beams opposing the free ends of the second set of elastic beams.

11. The fiber alignment assembly of claim 10, wherein the first and second sets of elastic beams are separated into independent elastic beams by slots defined in the main body.

12. The fiber alignment assembly of claim 10, wherein the first and second sets of elastic beams are parallel to the plurality of grooves.

13. The fiber alignment assembly of claim 10, wherein the plurality of grooves are V-grooves.

14. The fiber alignment assembly of claim 10, wherein the first and second structures are press-fit together.

15. The fiber alignment assembly of claim 10, wherein the first and second sets of elastic beams include projections that extend from respective bodies of the first and second sets of elastic beams toward the plurality of grooves.

16. A method for co-axially aligning first and second optical fibers to provide an optical coupling between the first and second optical fibers, the method comprising: positioning the first and second optical fibers in an alignment groove defined in a first part of an alignment device, end faces of the first and second optical fibers opposing each other at an optical interface; and pressing the first and second optical fibers into the alignment groove via biasing forces generated by elastic beams of a second part of the alignment device; wherein the elastic beams each have free ends and base ends, the base ends being unitarily formed with the second part of the alignment device; and wherein the elastic beams include a first elastic beam and a second elastic beam, wherein the first and second elastic beams are oriented in opposite directions with the free end of the first elastic beam opposing the free end of the second elastic beam.

17. The method of claim 16, wherein the elastic beams directly engage and press the first and second optical fibers toward the alignment groove.

18. The method of claim 16, wherein the alignment groove is a V-groove.

19. The method of claim 16, wherein the first and second parts are press-fit together.

20. The method of claim 16, wherein at least portions of the elastic beams angle toward the alignment groove.

21. The method of claim 16, wherein the elastic beams each include projections that extend from bodies of the elastic beams toward the alignment groove.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG. 1 is a first embodiment in perspective view of a self-centering structure for centering two optical fibers;

[0017] FIG. 2 is a partial cross-sectional perspective view of the self-centering structure of FIG. 1;

[0018] FIG. 3 is a perspective view of a self-centering device of the self-centering structure of FIGS. 1 and 2;

[0019] FIG. 4 is a perspective view of the self-centering device of FIG. 3;

[0020] FIG. 5 is a sectional view of a portion of the self-centering device of FIGS. 3 and 4;

[0021] FIG. 6 is a second embodiment in perspective view of a self-centering structure for centering two optical fibers;

[0022] FIG. 7 is a top view of the self-centering structure of FIG. 6;

[0023] FIG. 8 is a side view of the self-centering structure of FIG. 6;

[0024] FIG. 9 is an end view of the self-centering structure of FIG. 6;

[0025] FIG. 10 is a cross-sectional end view of the self-centering structure of FIG. 6 taken along lines 10-10 of FIG. 8;

[0026] FIG. 11 is an exploded perspective view of the self-centering structure of FIG. 6;

[0027] FIG. 12 is an end view of a self-centering device of the self-centering structure of FIGS. 6-11;

[0028] FIG. 13 is an opposite end view of the self-centering device of FIG. 12;

[0029] FIG. 14 is a first cross-sectional view of the self-centering device of FIG. 12 taken along lines 14-14;

[0030] FIG. 15 is a second cross-sectional view of the self-centering device of FIG. 12 taken along lines 15-15;

[0031] FIG. 16 is a top view of a fiber optic adapter useable with the self-centering structures of FIGS. 1-15;

[0032] FIG. 17 is a cross-sectional side view of the fiber optic adapter of FIG. 16;

[0033] FIG. 18 is a cross-sectional side view of a fiber optic connector useable with the fiber optic adapter of FIGS. 16-17;

[0034] FIG. 19 is a third embodiment in perspective view of a self-centering structure for centering two optical fibers;

[0035] FIG. 20 is a top view of a portion of the self-centering device of FIG. 19;

[0036] FIG. 21 is a side perspective view of FIG. 20;

[0037] FIG. 22 is a front perspective view of a portion of the self-centering device of FIG. 19;

[0038] FIG. 23 is a top perspective view of FIG. 22;

[0039] FIG. 24 is a front view of the self-centering device of FIG. 19;

[0040] FIG. 25 is a sectional view of a portion of the self-centering device of FIG. 19 without the fibers; and

[0041] FIG. 26 is a perspective view of the self-centering structure of FIG. 19 shown having two parts.

DETAILED DESCRIPTION

[0042] A self-centering structure 100, 200 is provided in accordance with a fiber alignment construction or system 10 to align fibers from ferrule-less connector plugs 600 or other structures. The fibers 302 protruding from the plugs are guided and aligned by a self-centering device 110, 210, including at least one cantilever member 120, 220 which projects at least partially at an angle toward the fiber axis 124, 224, and terminates at a distal end 122, 222. The cantilever members 120, 220 are flexible to centralize the fiber 302 for alignment with another fiber 302. FIGS. 2, 5, and 14 show the angling of the cantilever members. Such a construction allows for the funnel shape for fiber feeding, and for bending to create clamping forces on the fibers. The alignment construction 10 includes a fiber alignment region 103, 203 at an intermediate location between the first and second ends.

[0043] The self-centering structures can be assembled in a module or unit 105, 205, such as including a split sleeve 130 or other structure 230, wherein each self-centering structure includes at least one cantilever member 120, 220. Split sleeve 130 holds the separate parts together to form a single unit with an aligned fiber axis. Structure 230 is a press fit arrangement of the parts that remain as a single unit, also for maintaining the aligned fiber axis. Each unit 105, 205 includes opposite ends 107, 207.

[0044] In one example implementation, each self-centering structure 100 includes three cantilever members 120.

[0045] Preferably more than one self-centering device 110, 210 is provided per fiber. In one implementation, two self-centering devices 110, 210 are provided for each fiber.

[0046] If the self-centering structures 200 are provided with a single cantilever member 220, the cantilever member 220 presses the fiber toward a groove structure, such as a V-groove 228, or a gap or slot defined by two parallel rods 226.

[0047] If the self-centering structures 100 are provided with plural cantilever members 120, the cantilever members 120 press the fiber toward the other one or more cantilever members to centralize the fiber.

[0048] The self-centering devices 110, 210 each define a funnel shape 160, 260 to facilitate entry of the fiber 302 along the fiber axis 124, 224 or fiber alignment axis. The self-centering devices 110, 210 are positioned front to back in a stack for single fiber alignment (same direction of projection of the cantilever members). The pairs of stacked self-centering devices 110, 210 are positioned front to front relative to the centerline mating plane for alignment of two fibers end to end (opposite direction of projection of the cantilever members).

[0049] With the example embodiments showing four self-centering devices, the outer two serve as a pre-alignment structure. The inner two align the two mating fibers. At the contact zone, a gap 170, 270 is desired between the opposing cantilever members 120, 220 from opposite self-centering devices 110, 210. The gap can range from 100 microns to 1 millimeter. Less than or equal to 1 millimeter is desired. Less than or equal to 750 microns is more preferred, and less than or equal to 500 microns, and even less than 100 microns is useful. The gap avoids interference and allows for good fiber alignment. Index matching gels or oils can be used in the self-centering structures 100, 200. Hole 290 can be used to apply the index matching material.

[0050] In the case of self-centering device 110, the component can be made as an integral body 116, including the three cantilever members 120. In the case of self-centering device 210, the component can be made as an integral body 216 with the single cantilever member 220, and a passage 270. Passage 270 receives the two parallel rods 226 in a press-fit manner.

[0051] Integral bodies 116, 216 can be made from molded materials. Central passage 180, 280 through the structures 100, 200 is preferably smaller than the outer diameter of the fiber. In one example, forces in the range of 0.1-0.2 Newtons can be generated on the fiber 302 for alignment and centering.

[0052] Distal ends 122, 222 of cantilever members 120, 220 include a small center groove 150, 250 to facilitate centering and alignment of the fibers.

[0053] The self-centering structures 100, 200 can be used in an adapter 400. Adapter 400 receives at least on connector 600 on each end 402, 404 for defining a signal path between the two fibers 302 of the two connectors 600. The self-centering structures 100, 200 can be placed in alignment areas 500 within adapter 400. In the example shown, adapter 400 is a duplex adapter for joining two fibers, with each end 402, 404 receiving two connectors 600.

[0054] Connector 600 is an example connector, such as further shown in PCT Publication WO2013/117598, the disclosure of which is incorporated by reference. Connector 600 includes a connector body 602, and a moveable cover 604. A latch 606 latches the connector 600 to the adapter 400. Fiber 302 is shown protruding from the front end 608 of connector 600.

[0055] The optical fiber alignment devices can be incorporated into both ends of a fiber optic adapter. The optical fiber alignment devices can be incorporated into an adapter wherein the fiber optic adapter receives a ferrule-less connector on one end and a ferruled connector on an opposite end. The optical fiber alignment devices can also be incorporated into a converter for converting a ferrule-less connector into a ferruled connector.

[0056] In other examples, it may be desired to include another alignment structure for fiber optic ribbon cables. The alignment structure can be used to align each of the optical fibers as part of a process to optically connect each of the optical fibers precisely to a fiber optic connector. The optical fibers are held in alignment when provided in the ribbon matrix. FIG. 19 shows an example alignment self-centering structure 300 in accordance with a fiber ribbon alignment construction or system to align fibers from ferrule-less connector plugs or other structures. In one example, a fiber optic ribbon cable may include a plurality of optical fibers 308. Each of the plurality of optical fibers 308 includes a fiber axis 330 and each of the plurality of optical fibers 308 includes a bare optical fiber and a coating surrounding the bare optical fiber to form an external surface of the optical fiber.

[0057] The self-centering structure 300 can be made from molded materials. The self-centering structure 300 includes a body 310 having a first end 312, a second end 314, a top 316 and a bottom 311. The first end 312 defines a first opening 303 and the second end 314 defines an opposite second opening 304. The first and second openings 303, 304 each provide for optical fibers 308 to be centered and oriented in the bottom 311 of the self-centering structure 300. The bottom 311 has a plurality of groove structures 306 integrally formed, such as a V-grooves, or gaps, or slots. It will be appreciated that the groove structures 306 can include other groove profiles using various materials and manufacturing processes.

[0058] FIGS. 20-21 show the groove structures 306 in parallel alignment that extend along the fiber axis 330. Each of the plurality of optical fibers 308 may be inserted through the bottom 311 of the first and second openings 303, 304 such that the fibers are disposed within the groove structures 306 in a substantially uniform orientation to facilitate centering and alignment of a first plurality of optical fiber 308a with a second plurality of optical fiber 308b. In this manner, as a non-limiting example, the self-centering structure 300 provides an alignment of the first plurality of optical fibers 308a in the first opening 303 to the second plurality of optical fibers 308b in the second opening 304.

[0059] As depicted in FIG. 19, twelve optical fibers 308 are aligned in each of the first and second openings 303, 304 relative to one another. The first plurality of optical fibers 308a extend from the first opening 303 at the first end 312 into the self-centering structure 300 to align with the second plurality of optical fibers 308b extending from the second opening 304 at the second end 314 of the self-centering structure 300.

[0060] The top 316 of the body 310 of the self-centering structure 300 comprises a planar region 318. The planar region 318 contains a recess 320 including a plurality of cantilever members 322. In one example, the plurality of cantilever members 322 extend from the planar region 318 and project at least partially downward at an angle toward the optical fibers 308. It will be appreciated that the plurality of cantilever members 322 may be configured to press the optical fibers in the grooves without being angled down. For example, a cantilever member may include a bump (e.g., projection) that extends from the body of the cantilever to engage the fibers and press the fibers into a respective groove.

[0061] Referring again to FIG. 19, a first set of cantilever members 322a are generally on the first end 312 of the self-centering structure 300 and can extend downwardly in the recess 320 at an angle toward the first plurality of optical fibers 308a at the first opening 303. A second set of cantilever members 322b are generally on the second end 314 of the self-centering structure 300 and can extend downwardly at an angle toward the second plurality of optical fibers 308b at the second opening 304. As described above, the arrangement and configuration of the first and second plurality of cantilever members 322a, 322b may vary in other embodiments such that they do not angle downward into the recess 320.

[0062] In one example, the first set of cantilever members 322a are flexible and configured for urging each of the first plurality of optical fibers 308a into their respective groove structures 306 and the second set of cantilever members 322b are flexible and configured for urging each of the second plurality of optical fibers 308b into their respective groove structures 306. In other words, the first and second sets of cantilever members 322a, 322b respectively align the first and second plurality of optical fibers 308a, 308b to one another.

[0063] Referring to FIGS. 22-23, the recess 320 has an open bottom 324 such that a fiber alignment region 305 (see FIG. 19) is made visible between the first and second sets of cantilever members 322a, 322b. The fiber alignment region 305 can help to facilitate centering and alignment of the optical fibers 308 with another optical fiber 308. The cantilever members are arranged and configured on opposite sides of the fiber alignment region 305. The cantilever members are shown having one row on each side of the fiber alignment region 305. It will be appreciated that other embodiments can include two or more rows on each side of the fiber alignment region 305. The cantilever members 322 are flexible to centralize the optical fibers 308 for alignment with another optical fiber 308 in the fiber alignment region 305. FIGS. 23 and 25 show one configuration of the cantilever members 322 being angled downward to allow for bending to create clamping forces on the optical fibers 308 while in the groove structures 306 as shown in FIG. 24. It will be appreciated that other arrangements and configurations of the cantilever members 322 may be used.

[0064] The self-centering structure 300 can be assembled as a single module or unit including the groove structures 306 and cantilever members 322. The self-centering structure 300 can be made as an integral body including the twelve cantilever members 322 and groove structures 306. In other examples, a self-centering structure 300a can include two parts as shown in FIG. 26. A first part 326 including the groove structures 306 and a second part 328 including the cantilever members 322. The first and second parts 326, 328 can be press fit together to form a single unit with an aligned fiber axis. The cantilever members 322 press the fibers toward the other respective cantilever members 322 to centralize the fibers.

[0065] From the forgoing detailed description, it will be evident that modifications and variations can be made without departing from the spirit and scope of the disclosure.

PARTS LIST

[0066] 10 Alignment construction [0067] 100 Self-centering structure [0068] 103 Fiber alignment region [0069] 105 Alignment construction [0070] 107 Ends [0071] 110 Self-centering devices [0072] 116 Integral body [0073] 120 Cantilever member [0074] 122 Distal end [0075] 124 Fiber axis [0076] 130 Split sleeve [0077] 150 Alignment groove [0078] 160 Funnel shape [0079] 170 Gap [0080] 180 Central passage [0081] 203 Fiber alignment region [0082] 205 Unit [0083] 207 Ends [0084] 210 Self-centering devices [0085] 216 Integral body [0086] 220 One cantilever member [0087] 222 Distal end [0088] 224 Fiber axis [0089] 226 Alignment rods [0090] 228 V-groove [0091] 230 Structure [0092] 250 Alignment groove [0093] 260 Funnel shape [0094] 270 Passage [0095] 280 Central passage [0096] 290 Hole [0097] 300 Self-centering structure [0098] 302 Fiber [0099] 303 First opening [0100] 304 Second opening [0101] 305 Fiber alignment region [0102] 306 Groove structure [0103] 308 Optical fibers [0104] 308a First plurality of optical fibers [0105] 308b Second plurality of optical fibers [0106] 310 Body [0107] 312 First end [0108] 311 Bottom [0109] 314 Second end [0110] 316 Top [0111] 318 Planar region [0112] 320 Recess [0113] 322 Cantilever members [0114] 322a First set of cantilever members [0115] 322b Second set of cantilever members [0116] 324 Open bottom [0117] 326 First part [0118] 328 Second part [0119] 330 Fiber axis [0120] 400 Adapter [0121] 402 End [0122] 404 End [0123] 500 Alignment areas [0124] 600 Connector [0125] 602 Connector body [0126] 604 Moveable cover [0127] 606 Latch [0128] 608 Front end