1984-05-30
1990-02-27
Sikes, William L.
G02B 610
Patent
active
049040383
ABSTRACT:
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.
REFERENCES:
patent: 4153328 (1979-05-01), Wang
patent: 4265541 (1981-05-01), Leclerc et al.
patent: 4384760 (1983-05-01), Alferness
Kingston et al., Appl. Phys. Lett., 42(9), 1 May 1983, "Broadband Guided-Wave Optical Frequency Translator Using an Electro-Optical Bragg Array", pp. 759-761.
Heismann et al., IEEE J. of Quantum Electronics, QE-18, No. 4, Apr. 1982, "Integrated-Optical Single-Sideband Modulator and Phase Shifter", pp. 767-771.
Gonzalez Frank
Litton Systems Inc.
Sikes William L.
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