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Improved optical local-oscillator isolation using multiple acousto-optic modulators and frequency diversity

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Abstract

A technique is described and experimental evidence presented for obtaining ultrahigh isolation between the optical local oscillator and the transmitter in heterodyne systems. A degree of isolation that results in an equivalent fedback optical signal that is more than 200 dB below the transmitted power level has been achieved.

© 1987 Optical Society of America

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