G - Physics – 02 – F
Patent
G - Physics
02
F
345/55
G02F 1/03 (2006.01)
Patent
CA 1254642
GUIDED WAVE OPTICAL FREQUENCY SHIFTER Abstract of the Disclosure This invention is a frequency shifter for receiving an optical carrier signal input and producing an output including a sideband that is shifted in frequency from the carrier. The frequency shifter includes an optical waveguide formed in a substrate of an electro-optically active material such as lithium niobate. A plurality of electrodes formed on the substrate cooperate with a signal generator to apply two perpendicular electric fields to the optical waveguide. The resultant of the two fields is a rotating electric field which produces a rotating birefringence in the optical waveguide. The rotating birefringence acts as a rotating wave plate, which shifts the frequency of optical signals input to the optical waveguide. The wave plate is preferably a half wave plate, which converts all of the input optical energy into the sideband.
487268
Gowling Lafleur Henderson Llp
Litton Systems Inc.
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