Abstract
The effect of weak external reflections on distributed feedback (DFB) fiber laser (FL) sensor frequency noise
has been studied. For multiplexed DFB FL arrays, it was demonstrated that out-of-band reflections from DFB FL raise
the noise level of adjacent lasers by up to 50 dB. It was further demonstrated that by incorporating a complex
phase- and amplitude-apodized FL grating design with high sidelobe suppression, cross coupling due to out-of-band
reflections can be reduced to negligible levels, and Rayleigh backscatter limited noise performance can be achieved.
Practical limitations to acoustic sensitivity of DFB FL sensors due to increased laser frequency noise are
discussed, and ways to reduce DFB FL sensitivity to external reflections are proposed.
© 2007 IEEE
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