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High-performance heterodyne optical injection phase-lock loop using wide linewidth semiconductor lasers

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3 Author(s)
C. Walton ; Dept. of Electron. & Electr. Eng., Univ. Coll. London, UK ; A. C. Bordonalli ; A. J. Seeds

The requirements for narrow linewidth lasers or short-loop propagation delay limit optical phase-lock loop realizability with semiconductor lasers. Although optical injection locking can provide low-phase-error variance, its locking range is limited by stability considerations. The first experimental results for an heterodyne optical injection phase-lock loop are reported. Phase-error variance as low as 0.003 rad/sup 2/ in a bandwidth of 100 MHz, single-sideband (SSB) noise density of -94 dBc/Hz at 10-kHz offset and mean time to cycle slip of 3/spl times/10/sup 10/ s have been achieved using DFB lasers of 36-MHz summed linewidth, a loop propagation delay of 20 ns and an injection ratio of -30 dB.

Published in:

IEEE Photonics Technology Letters  (Volume:10 ,  Issue: 3 )