Optical subassembly having insertable cylindrical sleeve
View Patent ↗An optical subassembly (“OSA”) for use in optical communications modules is disclosed. The OSA solves various issues related to the insertion and removal of an optical fiber connector into and from the OSA receptacle, including hard plug, wiggle performance, and shavings production. In one embodiment, an optical communications module is disclosed and includes a housing and an optical subassembly of the present invention partially contained within the housing. The optical subassembly includes various components, including a body composed of a first material, and a plug receptacle formed with the body. The plug receptacle includes an inner surface on which surface features, such as threads, are formed. A hollow cylindrical sleeve composed of a second material is received in the plug receptacle such that the outer sleeve surface engages the surface features of the plug receptacle inner surface and such that an optical fiber connector can be received by the sleeve.
1. An optical communications module, comprising:
a housing; and
an optical subassembly at least partially contained within the housing, the optical subassembly including:
a body composed of a first material;
a plug receptacle operably attached to the body and including a bore with an inner surface;
a hollow cylindrical sleeve composed of a second material, the sleeve having an outer surface that engages the inner surface of the plug receptacle when the sleeve is received by the plug receptacle bore, the sleeve being configured to operably receive an optical fiber connector therein such that at least a portion of the optical fiber connector extends into the sleeve and into the plug receptacle bore;
a plurality of surface features defined on at least one of the inner surface of the plug receptacle and the outer surface of the sleeve, the surface features facilitating the insertion of the sleeve into the plug receptacle; and
wherein the hardness of the second material exceeds that of the first material.
2. The optical communications module as defined in claim 1 , wherein the hardness of the second material of which the sleeve is composed is approximately equal to the hardness of the optical fiber connector.
3. The optical communications module as defined in claim 1 , wherein the sleeve composed of the second material substantially fails to produce shavings when the at least a portion of the optical fiber connector is received in the sleeve.
4. The optical communications module as defined in claim 1 , wherein the first material of which the body is composed is aluminum, and wherein the second material of which the sleeve is composed is zirconium.
5. The optical communications module as defined in claim 1 , wherein the surface features are defined on the inner surface of the plug receptacle and the surface features define:
contact surfaces that engage the outer surface of the sleeve; and
recessed surfaces that do not engage the sleeve.
6. The optical communications module as defined in claim 1 , wherein an adhesive is used to secure the sleeve within the plug receptacle.
7. The optical communications module as defined in claim 1 , wherein the optical fiber connector is firmly held in place by the sleeve such that optical power of a light signal passing between the optical subassembly and the optical fiber connector is not substantially reduced when the optical fiber connector is wiggled.
8. The optical communications module as defined in claim 1 , wherein the surface features are selected from the group consisting of circular threads, helical threads, and knurls.
9. The optical communications module as defined in claim 1 , wherein the optical subassembly is a transmitter optical subassembly and wherein the optical communications module is an optical transceiver module in which the transmitter optical subassembly is positioned.
10. The optical communications module as defined in claim 1 , wherein the surface features limit contact between the inner surface of the plug receptacle and the outer surface of the sleeve.
11. A method for assembling an optical subassembly, the method comprising:
defining a body and a plug receptacle that are operably connected;
defining a plurality of surface features on an inner surface of the plug receptacle; and
inserting a sleeve having a continuous outer surface into the plug receptacle, the surface features of the inner surface of the plug receptacle engaging the outer surface of the sleeve and controlling the amount of sliding force required to insert the sleeve into the plug receptacle,
wherein the sleeve is configured to removably receive therein at least a portion of an optical fiber connector such that, when received within the sleeve, the at least a portion of the optical fiber connector is also received within the plug receptacle; and
wherein the hardness of the sleeve exceeds that of the body.
12. The method for assembling as defined in claim 11 , further comprising:
sizing the inner surface of the plug receptacle having the surface features to an inner diameter that substantially matches an outer diameter of the sleeve before inserting the sleeve into the plug receptacle.
13. The method for assembling as defined in claim 11 , further comprising:
applying an adhesive to the sleeve before inserting the sleeve into the plug receptacle.
14. The method for assembling as defined in claim 11 , wherein inserting the sleeve further comprises:
press fitting the sleeve into the plug receptacle.
15. The method for assembling as defined in claim 11 , wherein the amount of force required to press fit the sleeve into the plug receptacle is reduced as a result of the plurality of surface features on the inner surface of the plug receptacle.