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Serrodyne optical frequency shifting for heterodyne self-mixing in a distributed-feedback fiber laser

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Abstract

We describe an all-fiberized coherent detection system at 1.55μm using heterodyne self-mixing modulation in a distributed-feedback fiber laser. Frequency shifting of the optical feedback is based on serrodyne phase modulation with an integrated electro-optic modulator, which is a significant advance in the simplification of the self-mixing detection scheme for class B lasers. Accurate measurement of the optical phase difference between the laser electric field and the backscattered electric field demonstrates nanometric displacement detection on noncooperative targets.

© 2008 Optical Society of America

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