Suppression of coherent rayleigh noise in bidirectional communic

Optical: systems and elements – Deflection using a moving element – Using a periodically moving element

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359169, 359170, H04B 1000

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active

061376116

ABSTRACT:
Low-noise, bidirectional communications in a fiber optic cable is achieved by coupling a first end of the cable to an optical power source having an inherently broad spectral width. A second end of the cable is coupled to an optical detector having a detector bandwidth, such that the bandwidth of the optical power source is greater than the detector bandwidth. When the bandwidth of the optical power source is large compared to the bandwidth of the detector, the beat frequencies resulting from coherent Rayleigh noise fall outside the bandwidth of the detector and are not detected.

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"Statistical Properties of Rayleigh Backscattering in Single-Mode Fibers," P. Gysel, et al., J. Lightwave Tech., vol. 8, No. 4, Apr. 1990, pp. 561-567.

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