Quadrature optical phase modulators for lightwave systems

Details Quadrature optical phase modulators for lightwave systems Quadrature optical phase modulators for lightwave systems

H - Electricity

04

B

H04B 10/04 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2059835

90-3-822C QUADRATURE OPTICAL PHASE MODULATORS FOR LIGHTWAVE SYSTEMS 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 modula- tor provides cancellation of second order intermodulation products in each optical signal, thereby permitting the optical carrier frequencies to be spaced by 2fmaX, where fmax 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 fmax. 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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