H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/1.81
H04J 1/02 (2006.01) G02B 6/28 (2006.01) G02B 6/34 (2006.01)
Patent
CA 1197931
PASSIVE FIBER OPTIC MULTIPLEXER Abstract of the Disclosure A passive, frequency selective, fiber optic multiplexer comprises a directional coupler in which a pair of single mode optical fibers are accurately positioned to provide evanescent field coupling, typically by polishing a portion of the cladding from each of the fibers to place the respective cores of the fibers within the evanescent field of light in the other fiber. The coupling efficiency of a coupler constructed in this manner is wavelength dependent, and provides over- coupling, that is, the capability of transferring light, virtually entirely, back and forth between the fibers within the coupler. The wavelength dependent nature of the evanescent field coupling permits multiplexing, specifically between a pair of wavelengths, one of which is coupled in its entirety from a first fiber to a second fiber, and the other of which is essentially uncoupled. By increasing the number of total-transfers of the light signals between the pair of fibers, the frequency resolution of the multiplexer may be optimized for light- signals of virtually any frequency separation. OA-10:JHL
415105
Digonnet Michel J.f.
Shaw Herbert J.
Board Of Trustees Of The Leland Stanford Junior University
Gowling Lafleur Henderson Llp
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