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Opt Lett. 2009 Nov 1;34(21):3256-8. doi: 10.1364/OL.34.003256.

Sideband locking of a single-section semiconductor distributed-feedback laser in an optical phase-lock loop.

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Department of Electrical Engineering, California Institute of Technology, 1200 E. California Boulevard 136-93, Pasadena, California 91125, USA.


The bandwidth and performance of optical phase-lock loops (OPLLs) using single-section semiconductor lasers (SCLs) are severely limited by the nonuniform frequency modulation response of the lasers. It is demonstrated that this restriction is eliminated by the sideband locking of a single-section distributed-feedback SCL to a master laser in a heterodyne OPLL, thus enabling a delay-limited loop bandwidth. The lineshape of the phase-locked SCL output is characterized using a delayed self-heterodyne measurement.

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