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Laser phase noise effects with fiber-optic signal processors with recirculating loops

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Abstract

Recently several fiber-optic signal processors have been introduced which employ recirculating single-mode loops. These include the fiber-optic systolic matrix-vector multiplier1 and the recirculating delay line filter.2 Proper operation of these processors requires addition of optical intensities rather than amplitudes, and, therefore, short coherence sources must be used with a coherence time τc much shorter than the smallest loop delay τ. We demonstrate that the dynamic range of such processors is severely limited by intensity noise whose origin is the laser phase fluctuations. We also show that the power spectrum of the output noise is characterized by minima at zero frequency as well as at other integer multiples of the inverse of the loop delay.

© 1983 Optical Society of America

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