Claims
- 1. An optical sub-assembly for an optical module, comprising:
an optical port housing formed of a material that does not significantly shield electromagnetic interference, including:
a body portion having a receptacle end and an optical coupling end; a head end having a bore shaped to receive an optical fiber; a neck portion connecting the body portion to the head end; an active optical device disposed in the receptacle end of the body portion of the optical port housing; and an electrically conductive cap disposed on the head portion of the port housing to reduce electromagnetic interference.
- 2. The optical sub-assembly of claim 1, wherein the optical port housing is comprised of plastic.
- 3. The optical sub-assembly of claim 1, wherein the optical port housing includes a plastic lens for coupling light between the active optical device and an optical fiber disposed in the optical port housing.
- 4. The optical sub-assembly of claim 1, further comprising:
a collar disposed on the head end, the electrically conductive cap disposed on the collar.
- 5. The optical sub-assembly of claim 1, wherein the collar has an annular shape with a front annulus, back annulus, and a rim, the conductive cap disposed over the front annulus and over at least a portion of the rim.
- 6. The optical sub-assembly of claim 5, wherein the neck portion is shaped to be held between a yoke and a restraining bar.
- 7. The optical sub-assembly of claim 6, wherein stop surfaces disposed on each end of the neck permit a limited range of motion in the yoke.
- 8. An optical transceiver or transponder module, comprising:
a receiver optical sub-assembly having a first port housing comprised of a material that does not block electromagnetic interference, the first port housing having a first body portion at one end for housing an optical detector, a first head end having a first collar and a first bore for receiving a first optical fiber, and a first neck disposed between the first body portion and the first collar; a first electrically conductive cap disposed on the first collar of the first port housing; a transmitter optical sub-assembly having a second port housing comprised of a material that does not block electromagnetic interference, the second port housing having a second body portion at one end for housing a laser, a second head end having a second collar and a second bore for receiving a second optical fiber, and a second neck disposed between the second body portion and the second collar; a second electrically conductive cap disposed on the second collar of the second port housing; a conductive shell having an electronics section and an optical fiber connector end; an electrically conductive yoke disposed in the conductive shell proximate the connector end, the yoke shaped to fit about the neck portions of the optical sub-assemblies with the body portions disposed within the electronics section of the shell and the head ends disposed in the connector end; the first and second electrically conductive caps defining apertures for the emission of electromagnetic interference from the electronics section to the connector end.
- 9. The module of claim 8, wherein the necks are movably coupled to the yoke, whereby each optical sub-assembly may move compliantly in response to a load imposed by an optical fiber connector.
- 10. The module of claim 8, further comprising a restraining bar shaped to fit about portions of the neck of each optical sub-assembly not held by the yoke.
- 11. The module of claim 8, wherein the yoke, the restraining bar and the first and second electrically conductive caps are electrically coupled to the shell.
- 12. The optical module of claim 8, wherein each optical sub-assembly is coupled to a printed circuit board disposed within the shell by a flexible electrical connector.
- 13. The module of claim 8, wherein each cap is a metal cap deposited onto the port housing.
- 14. The module of claim 13, wherein each cap is a metal cap molded onto the port housing.
- 15. An optical module, comprising;
a first optical sub-assembly having a body portion, a neck portion, and a head portion, the head portion including a bore opening for receiving an optical fiber; a second optical sub-assembly having a body portion, a neck portion, and a head portion, the head portion including a bore opening for receiving an optical fiber; an electrically conductive yoke for movably coupling the neck portions of the first and second optical sub-assembly; a first electrically conductive cap disposed on the head portion of the first optical subassembly; a second electrically conductive cap disposed on the head portion of the second optical sub-assembly; the yoke and electrically conductive caps forming an electromagnetic interference shield in an optical fiber connector end of the module.
- 16. The module of claim 15, wherein the yoke is electrically coupled to a conductive shell.
- 17. The module of claim 15, wherein an optical detector in the first optical sub-assembly is electrically coupled to an electronic circuit in the module via a flexible electrical connector.
- 18. The module of claim 15, wherein a laser in the second optical sub-assembly is electrically coupled to an electronic circuit in the module via a flexible electrical connector.
- 19. The module of claim 15, further comprising an electrically conductive restraining bar for restraining the neck portions in the yoke.
- 20. The module of claim 15, wherein the caps define two apertures for emission of electromagnetic interference.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority under 35 U.S.C.§ 119(e) to U.S. Provisional Patent Application No. 60/357,190, entitled “Optical Module With Simplex Port Cap EMI Shield,” filed Feb. 15, 2002, the contents of which are hereby incorporated by reference in their entirety.
Provisional Applications (1)
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Number |
Date |
Country |
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60357190 |
Feb 2002 |
US |