G - Physics – 02 – F
Patent
G - Physics
02
F
G02F 1/035 (2006.01) G02F 1/03 (2006.01) G02F 1/225 (2006.01) H04B 10/04 (2006.01) H04B 10/18 (2006.01)
Patent
CA 2058580
90-3-823 -32- OPTICAL MODULATOR FOR CANCELLATION OF SECOND-ORDER INTERMODULATION PRODUCTS IN 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 modulator 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 wideband 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.
Gte Laboratories Incorporated
Olshansky Robert
R. William Wray & Associates
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