Abstract
Abstract Rayleigh-back scattering induced coherence collapse of an asymmetric distributed feedback fiber laser (DFB FL) sensor is investigated using a composite cavity model. The coherence collapse threshold condition of the asymmetric DFB FL sensor is measured. The DFB FL sensor shows different dynamic behaviors in different pump configurations. According to the asymmetric behavior to the external optical feedback, a novel method to find the actual phase shift position of the asymmetric DFB FL sensor is presented.
Highlights
Distributed feedback fiber lasers (DFB FLs) have attracted general attention since 1990s, because of the impact structure, low noise figure, and the inherent wavelength-encoded multiplexing capability [1,2,3,4]
The laser frequency of a DFB FL is determined by the resonance condition of the laser cavity, which is sensitive to the physical parameters that could disturb the oscillation process
We study the tolerance of asymmetric DFB FL to Rayleigh backscattering of a Article type: Regular
Summary
Distributed feedback fiber lasers (DFB FLs) have attracted general attention since 1990s, because of the impact structure, low noise figure, and the inherent wavelength-encoded multiplexing capability [1,2,3,4]. Rayleigh backscattering may cause excess frequency noise or even unstable output of the DFB FLs, namely, coherence collapse [7], and substantially affects the performance of DFB FL sensors. The tolerable length of lead fiber was found to be 135 m‒200 m for symmetric DFB FL [6], corresponding to a typical Rayleigh backscattering of ‒72 dB/m, while the dynamic behavior of asymmetric DFB FL with external optical feedback was rarely mentioned.
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