Optical transceiver with optical multiplexer on a flexible substrate
View Patent ↗An optical transceiver for converting and coupling an information-containing electrical signal with an optical fiber including an optical fiber coiled over at least a portion of its length; a support element disposed in the transceiver module; a substrate for securing said coiled optical fiber to said support element to enable said coiled fiber to bend from a first direction to a second opposite direction inside said transceiver module; and an optical multiplexer secured to said substrate for receiving first and second optical fibers and multiplexing respective optical signals on said first and second optical fibers into a multi-wavelength beam onto a third optical fiber.
1. An optical transceiver module for converting between an information containing electrical signal and a modulated optical signal transported over at least one optical fiber in the transceiver module comprising:
at least one optical fiber coiled over at least a portion of its length;
a physical support disposed in the transceiver module;
a flexible substrate for securing said at least one coiled optical fiber to said support to enable said coiled fiber to bend from a first direction to a second opposite direction inside said transceiver module, wherein the coiled optical fiber provides a continuous optical path between the first direction and the second opposite direction; and
an optical multiplexer mounted on said flexible substrate for receiving first and second optical fibers and multiplexing respective optical signals on said first and second optical fibers into a single multi-wavelength beam onto a single third optical fiber, wherein said optical multiplexer is selected from the group consisting of an arrayed waveguide grating and a multimode interference coupler.
2. An optical transceiver as defined in claim 1 , further comprising:
a housing having a cover and a base;
an optical receive board directly mounted to the housing base; and
a fiber optic connector receptacle in the housing that couples an optical communications signal from an external optical fiber to the receive board.
3. An optical transceiver as defined in claim 2 , further comprising an electro-optical subassembly including a plurality of lasers for converting between said information-containing electrical signal and said modulated optical signal corresponding to the electrical signal from which at least two optical fibers engage said flexible substrate to prevent tangling.
4. A transceiver as defined in claim 1 , wherein said flexible substrate comprises a Kapton™ film.
5. A transceiver as defined in claim 1 , wherein said flexible substrate comprises a FlexPlane™ material.
6. An optical transceiver as defined in claim 1 , further comprising a conforming coating over the flexible substrate to secure said at least one coiled optical fiber.
7. A transceiver as defined in claim 1 , further comprising an electro-optical subassembly including first and second lasers operating at different wavelengths and modulated with respective first and second electrical signals for emitting first and second laser light beams coupled to said first and second optical fibers, respectively.
8. A transceiver as defined in claim 1 , wherein said single third optical fiber is secured to said flexible substrate.