Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Patent
1991-01-23
1992-03-31
Healy, Brian
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
385 14, 385 40, 385 45, 359127, 359128, 359183, 359188, G02B 610, H04J 100
Patent
active
051014505
ABSTRACT:
Optical communication methods and apparatus are disclosed for transmitting two or more optical signals with different optical carrier frequencies on a single optical fiber with high spectral efficiency. Each optical carrier is typically modulated with multiple modulated subcarriers. In one embodiment, an optical phase modulator provides cancellation of second order intermodulation products in each optical signal, thereby permitting the optical carrier frequencies to be spaced by 2f.sub.max, where f.sub.max is the maximum modulation frequency. In another embodiment, a single sideband optical phase modulator provides cancellation of second order intermodulation products and one signal sideband, thereby permitting the optical carrier frequencies to be spaced by f.sub.max. Quadrature optical phase modulators for simultaneous transmission of two independent baseband digital data signals or two independent subcarrier multiplexed signals are disclosed.
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GTE Laboratories Incorporated
Healy Brian
Monks Lawrence E.
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