As demand for telecommunications increases, fiber optic networks are being extended into more and more areas. As a result, there is a need for manufacturing efficiencies including for the fixtures and methods used in the development of fiber optic devices such as fiber optic connectors.
An aspect of the present disclosure relates to fixtures used in the manufacture of fiber optic devices such as fiber optic connectors. One particular aspect relates to a fiber optic connector carrier that serves as a fixture to be used in one or more of the manufacturing steps in the securing and termination of optical fibers to fiber optic connectors. The connector carrier is provided as a traveling fixture that can be moved around within a manufacturing facility among the different stations for terminating the optical fibers and forming the fiber optic connectors.
According to one aspect, the disclosure is directed to a fiber optic connector fabrication carrier. The fabrication carrier defines a body configured to removably hold a plurality of fiber optic ferrules. The body allows each of the fiber optic ferrules to be movable along its axis under a bias when the ferrules are mounted to the body. The body can be coupled to a polishing plate for use with a ferrule polishing apparatus in a polishing step. Coupling of the body to the polishing plate allows each of the ferrules to at least partially protrude past a bottom face of the polishing plate for contact with the polishing apparatus. The body of the fabrication carrier is configured as a fixture that can be used in at least one additional fabrication step aside from the polishing step when not mounted to the polishing plate.
Another aspect of the present disclosure relates to a polishing fixture for use with a fiber optic ferrule polishing apparatus in a polishing step, the polishing fixture comprising a polishing plate defining a bottom face directed toward a grinding film of the polishing apparatus. The polishing fixture further includes a fabrication carrier for fiber optic connectors, the carrier comprising a body removably mounted to the polishing plate. The carrier is configured to removably hold a plurality of fiber optic ferrules, the body of the carrier allowing each of the fiber optic ferrules to be movable along its axis under a bias when the ferrules are mounted to the body, wherein when the fiber optic ferrules have been mounted to the carrier, each of the fiber optic ferrules at least partially protrude past the bottom face of the polishing plate for contact with the polishing apparatus.
According to another aspect of the disclosure, a polishing plate for use on a polishing fixture of a polishing apparatus comprises a top face and an opposing bottom face configured to be directed toward a grinding film of the polishing apparatus. A recess is exposed on the top face for receiving a body of a fabrication carrier removably holding a plurality of fiber optic ferrules. A plurality of discrete ferrule sleeves are defined within the recess, the ferrule sleeves configured to receive and allow the fiber optic ferrules to at least partially protrude past the bottom face of the polishing plate for contact with the grinding film of the polishing apparatus.
According to yet another aspect, the disclosure is directed to a fiber optic connector fabrication method. The method comprises at least removably coupling a connector carrier to a polishing plate, wherein the polishing plate defines a top face and an opposing bottom face configured to be directed toward a grinding film of a polishing apparatus and a recess exposed on the top face for receiving the connector carrier. The connector carrier holds a plurality of fiber optic ferrules, the connector carrier allowing each of the fiber optic ferrules to be movable along its axis under a bias, wherein when the connector carrier is coupled to the polishing plate, each of the fiber optic ferrules at least partially protrudes past the bottom face of the polishing plate for contact with the grinding film of the polishing apparatus.
A variety of additional inventive aspects will be set forth in the description that follows. The inventive aspects can relate to individual features and combinations of features. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the broad inventive concepts upon which the embodiments disclosed herein are based.
The present disclosure is directed generally to the manufacture of certain fiber optic devices, particularly, fiber optic connectors that are used for terminating optical fibers.
Referring to
As known in the art, fiber optic connectors are generally used to align optical signals carried by opposing optical fibers via a third inter-mating structure such as a fiber optic adapter. Fiber optic adapters generally include features for selectively and removably receiving two opposing fiber optic connectors in an aligned relationship for the continuation of the optical signal.
An example fiber optic connector may define an outer housing that houses a ferrule surrounding the optical fiber. The ferrules serve as the alignment structures between two connectors and have to go through a number of processing steps at the factory level in order to improve alignment and limit signal degradation during use in the field when mating two connectors.
An example of a conventional fiber optic connector 220 is discussed herein with respect to
Referring now to
In certain embodiments of the connector 220, the front housing portion 224 may be formed from a molded plastic. The front housing portion 224 defines a latch 242 extending from a top wall 244 of the front housing portion 224 toward the rear end 246, the latch 242 extending at an acute angle with respect to the top wall 244 of the front housing portion 224. The front housing portion 224 in the depicted embodiment also includes a latch trigger 248 that extends from the rear end 246 of the front housing portion 224 toward the front end 240. The latch trigger 248 also extends at an acute angle with respect to the top wall 244. The latch trigger 248 is configured to come into contact with the latch 242 for flexibly moving the latch 242 downwardly.
As is known in the art, when the fiber optic connector 220 is placed in an LC format adapter for optically coupling light from two optical fibers together, the latch 242 functions to lock the fiber optic connector 220 in place within the adapter. The fiber optic connector 220 may be removed from the adapter by depressing the latch trigger 248, which causes the latch 242 to be pressed in a downward direction, freeing catch portions 252 of the latch 242 from the fiber optic adapter.
A strain relief boot 256 may be slid over a rear end 258 of the rear housing portion 226 and snap over a boot flange 260 to retain the boot 256 with respect to the connector housing 222. The rear end 258 of the rear housing portion 226 defines a crimp region 262 for crimping a fiber optic cable's strength layer to the rear housing portion 226, normally with the use of a crimp sleeve. An exterior surface 264 of the rear housing portion 226 defining the crimp region 262 can be textured (e.g., knurled, ridged, provided with small projections, etc.) to assist in retaining the crimp on the housing 222.
Movement of the ferrule 230 of the LC connector in a rear direction relative to the connector housing 222 under the bias of the spring 234 causes the optical fiber to be forced/displaced in a rear direction relative to the connector housing 222 and the jacket of the fiber optic cable. The biased movement of the ferrule 230 allows for any geometry discrepancies and tolerance variations when axially mating two of the fiber optic connectors 220.
Referring now specifically to
Referring generally to
Referring to
Referring now to
As shown in
The latch inserts 108 are arranged within the pocket 118 such that a portion of the front housings 224 of the connectors 220 and the ferrules 230 protrude through the apertures 116 provided at the bottom side 114 of the carrier 100. This is shown in
The cover portion 106, shown in isolation in
Referring to
As noted above, the latch inserts 108 are provided in a generally floating configuration within the pocket 118, captured between the base portion 104 and the cover portion 106. The springs 122 on the latch inserts 108 bias or urge the latch inserts 108 downwardly toward the bottom side 114 of the base portion 104 of the carrier 100. In this manner, as will be discussed in further detail below, when the connector carrier 100 has been mounted on a polishing fixture and the ferrules 230 protruding from the carrier 100 are ready for the polishing step, each latch insert 108 is urged toward a grinding board of a polishing machine independently of the other latch inserts 108. As such, the pressures of the tips of all of the ferrules 230 on the grinding board are substantially the same, regardless of the variation of the lengths of the ferrules 230 being polished. It should be noted that the spring constant of the coil springs 122 of the latch inserts 108 is smaller than the spring constant of the ferrule springs 234 that are within the LC connector housings 222.
As noted previously, the connector carrier 100 of the present disclosure may be provided as a traveling fixture that not only facilitates the ferrule polishing process but that can also be moved within a manufacturing facility among the different stations in terminating the optical fibers to the fiber optic connectors 220.
According to an example manufacturing process, the first step can be to latch a plurality of unterminated connector housings 222 (similar to that shown in
When the unterminated connector housings 222 are within the connector carrier 100, a portion of the front housings 224 and the ferrules 230 protrude through the apertures 116 provided at the base portion 104 of the carrier 100, as illustrated in
The design of the connector carrier 100 that allows the front housings 224 and the ferrules 230 to at least partially protrude through the apertures 116 and be exposed to an exterior of the carrier 100 may facilitate certain aspects of the fabrication process. For example, as will be discussed below, certain process steps such as cleaving of the fibers may be performed without having to remove the connectors 220 from the carrier 100, using the carrier 100 itself as a fixture during this process step.
For the fabrication of the connectors, at the next step, the connector carrier 100 may be used to carry all of the unterminated connector housings 222 to an epoxy dispensing station, where an epoxy application needle may be used to dispense a preselected amount of epoxy for the securement of the optical fibers within the connectors 220.
After the optical fibers (e.g., the jacket and the strength layers) are stripped to a preselected length, exposing the buffer and glass layers, the connector carrier 100 can be moved to an insertion station where the stripped fibers can be inserted from a rear end 258 of the rear housing portion 226 into the ferrules 230. At the insertion station, the carrier 100 can be mounted to an insertion fixture for individual insertion of the optical fibers into the epoxy filled ferrules 230.
After curing of the epoxy and passing through a cooling station, the connector carrier 100 may be moved to a cleaving station, where the fibers protruding outwardly from the ends of the ferrules 230 may be cleaved to a length of around 50-100 microns from the ends of the ferrules 230.
The connector carrier 100 is now ready to be moved to a polishing station. The polishing station may comprise a polishing plate 130 that is part of a polishing fixture 132 to be used with a grinding apparatus or machine. The grinding apparatus may include a grinding board on which a grinding film is mounted. In certain examples, the grinding board is configured to travel in a combined polishing motion that includes revolutions on its own axis and movement throughout a preselected orbit. In certain other examples, simple rotation may be used.
An example of a polishing plate 130 that is configured to receive the connector carrier 100 depicted in
Referring back to
As depicted, each recess 134 defines an outer perimeter that is shaped to receive the carrier 100 in a given orientation. The polishing plate 130 also defines further keying or guide features 136 for aligning with keying holes 137 provided at the bottom side 114 of the base portion 104 of the carriers 100.
As depicted, each recess 134 within the polishing plate 130 defines a plurality of ferrule sleeves 138 positioned within connector housing sub-recesses 140. When the carriers 100 are mounted to the polishing plate 130, the sub-recesses 140 accommodate the portions of the front housings 224 protruding from the carrier bases 104 while the ferrule sleeves 138 receive the protruding ferrules 130. The ferrule sleeves 138 provide stability to the ferrules 230 of the connectors 220 while allowing the ferrules 230 to protrude to the underside 142 of the polishing plate 130 for contact with the grinding film of the polishing apparatus.
As shown in
Handles 150 may also be provided on the polishing plate 130 for assistance with the placement and removal of the overall polishing fixture 132 to and from the grinding apparatus.
It should be noted that, while the polishing plate 130 depicted in
For example,
It should also be noted that the example of the connector carrier 100 shown in
For an ultra-physical contact polishing operation involving SC style connectors, a similar carrier to that shown for the LC style connectors 220 may be used, but with a maximum of six SC connectors per row of two rows.
Referring now to
The LC clip inserts 308, shown in
As an alternative example, views of an SC style insert latch 309 for use with an angled physical contact carrier 300 similar to that shown in
Although in the foregoing description, terms such as “top,” “bottom,” “front,” “back,” “right,” “left,” “upper,” and “lower” were used for ease of description and illustration, no restriction is intended by such use of the terms. The telecommunications devices described herein can be used in any orientation, depending upon the desired application.
Having described the preferred aspects and embodiments of the present disclosure, modifications and equivalents of the disclosed concepts may readily occur to one skilled in the art. However, it is intended that such modifications and equivalents be included within the scope of the claims which are appended hereto.
This application is a continuation of PCT/US2020/024688, filed on Mar. 25, 2020, which claims the benefit of U.S. Patent Application Ser. No. 62/826,546, filed on Mar. 29, 2019, the disclosures of which are incorporated herein by reference in their entireties. To the extent appropriate, a claim of priority is made to each of the above disclosed applications.
Number | Date | Country | |
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62826546 | Mar 2019 | US |
Number | Date | Country | |
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Parent | PCT/US2020/024688 | Mar 2020 | US |
Child | 17484630 | US |