Optical communication system

Details Optical communication system Optical communication system

1992-09-14

1995-07-11

Boudreau, Leo H.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359183, 359126, 359161, 359154, H04B 1004, H04B 1000

Patent

active

054326320

ABSTRACT:
An optical communication system in which light is modulated in sending equipment according to a composed signal obtained by mixing a signal frequency-multiplexed at the microwave level in a coherent SCM optical communication system with an unmodulated signal out of the frequency band of the frequency-multiplexed signal. The resultant modulated light is optical-heterodyne-detected. A demodulating unit demodulates a frequency-multiplexed signal according to an electric signal delayed by a delay unit by the time equal to the time delay in an unmodulated component extracting unit. Only the frequency components of a frequency-multiplexed signal and an unmodulated signal must be received in receiving equipment, without receiving the component in a broad frequency band from the frequency component to the main carrier component of the frequency-multiplexed signal.

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T. Chikama et al., "Modulation and Demodulation Techniques in Optical Heterodyne PSK Transmission Systems", Journal of Lightwave Technology, vol. 8, No. 3, pp. 309-322, Mar. 1990, New York.

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