It is well known that back-reflections in single mode semiconductor lasers usually lead to line broadening and amplitude increase of noise. We will show that a particular choice of the laser bias, which we have called the crossover working point, is helpful to mitigate these effects. Starting the analysis using a self-mixing interferometer, we demonstrate a decrease of the disturbances as high as 40dB in the weak and moderate feedback regimes. We also extend the analysis for incoherent and coherent feedback for the case of high level of injection arising from an all-fiber setup. Two different semiconductor laser devices have been tested to verify the analysis predictions, with good agreement with experimental results.

Date Published: 5 June 2008
PDF: 10 pages
Proc. SPIE 7022, Advanced Laser Technologies 2007, 70220H (5 June 2008); doi: 10.1117/12.803925

Published in SPIE Proceedings Vol. 7022:
Advanced Laser Technologies 2007
Ivan Alexandrov Shcherbakov; Risto Myllylä; Alexander V. Priezzhev; Matti Kinnunen; Vladimir I. Pustovoy; Mikhail Yu. Kirillin; Alexey P. Popov, Editor(s)