High performance subcarrier multiplexed optical...

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H - Electricity

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H04B 10/00 (2006.01) H04B 10/142 (2006.01) H04J 14/02 (2006.01)

Patent

CA 1309783

HIGH PERFORMANCE SUBCARRIER MULTIPLEXED OPTICAL COMMUNICATION SYSTEM WITH MODULATION INDEX EXCEEDING UNITY Abstract An optical communication system includes an optical transmitter for transmitting a subcarrier multiplexed optical signal through a single mode optical fiber to an optical receiver. The optical transmitter includes an optical source for generating a light beam. The optical source is preferably a high speed laser diode emitting in a spectral range of 1.3-1.6 micrometers. The light beam is intensity modulated with a composite modulation signal comprising multiple modulated microwave carriers. Each of the microwave carriers intensity modulates the light beam with a modulation index mi to provide the optical signal for transmission. The total modulation index M, defined by M = .SIGMA. mi, of the optical signal exceeds unity without degradation of the signal-to-noise ratio. By permitting the total modulation index to exceed unity, a large number of microwave carriers can simultaneously be transmitted, and the information- carrying capacity of the optical communication system is enhanced.

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