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Published on: February 28, 2016
Serrodyne optical frequency shifting for heterodyne self-mixing in a distributed-feedback fiber laser
Mathieu Laroche1, Célia Bartolacci, Guillaume Lesueur
1Equipe Lasers, Instrumentation Optique et Applications (LIOA)-Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), UMR 6252 CEA-CNRS-ENSICAEN, Université de Caen, France. mathieu.laroche@ensicaen.fr
Abstract:
We describe an all-fiberized coherent detection system at 1.55 microm 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.
