9 November 2016 Research of the suppression of the phase noise in DFB fiber laser by self-injection locking
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Abstract
The intrinsic phase noise of distributed feedback (DFB) fiber laser greatly reduces the signal to noise ratio (SNR) of unbalance interferometric fiber sensor system, which has a negative influence on the demodulation of tiny signal. In order to suppress the phase noise of DFB fiber laser (DFB-FL), a self-injecion locking DFB-FL was presented. Result of experiment demonstrated that the phase noise can be suppressed by the self-injection locking structure and the effect of suppression was improved with the increase of the length of locking ring. When the length of locking ring is two meters, the phase noise above 500Hz decreases by 8 dB / √Hz demodulated by an one meter optical path difference asymmetric Michelson Interference, and the mode is not hoping in eight hours. Contrast with the unlocked DFB-FL, the pump efficiency of self-injection locking DFB-FL is increased by 30%.
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Jianfeng Tang, Yinfa Zhang, Zhenglong Yu, Shuidong Xiong, Lina Ma, "Research of the suppression of the phase noise in DFB fiber laser by self-injection locking", Proc. SPIE 10018, Advanced Laser Processing and Manufacturing, 100180J (9 November 2016); doi: 10.1117/12.2247568; https://doi.org/10.1117/12.2247568
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