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ZHANG Yun-hao, LIU Kui, GAO Jiang-rui, WANG Jun-min. Investigation of characteristics of a DFB laser diode with feedback from a fiber Bragg grating based long external cavity[J]. Chinese Optics. doi: 10.37188/CO.2024-0016
Citation: ZHANG Yun-hao, LIU Kui, GAO Jiang-rui, WANG Jun-min. Investigation of characteristics of a DFB laser diode with feedback from a fiber Bragg grating based long external cavity[J]. Chinese Optics. doi: 10.37188/CO.2024-0016

Investigation of characteristics of a DFB laser diode with feedback from a fiber Bragg grating based long external cavity

doi: 10.37188/CO.2024-0016
Funds:  Supported by National Natural Science Foundation of China (No. 11974226)
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  • Corresponding author: wwjjmm@sxu.edu.cn
  • Received Date: 15 Jan 2024
  • Accepted Date: 08 Mar 2024
  • Available Online: 10 May 2024
  • Narrow linewidth lasers are the basic components of spectroscopy and precision metrology and other experiments. Because semiconductor laser is very sensitive to external optical feedback, the phase noise of semiconductor laser can be suppressed by using the high bandwidth of optical feedback, and then the linewidth can be narrowed. So we use fiber Bragg grating as feedback element and build a long external cavity feedback loop. In order to reduce the influence of external environment temperature fluctuation and air flow disturbance, we control the temperature of the fiber of the feedback optical path. Then the maximum temperature fluctuation within 1 hour is reduced from 0.039 °C to 0.003 °C, and the variance of temperature fluctuation is reduced by two orders of magnitude. In addition, we also test the effect of feedback bandwidth on laser linewidth. Although the bandwidth of the fiber Bragg grating used in our experiment is much larger than the free-running laser linewidth, we still observe that the laser linewidth is narrowed, and the smaller the bandwidth of the fiber Bragg grating, the narrower the laser linewidth. For this phenomenon, we believe that there should be a negative feedback mechanism in the feedback loop, which can stabilize the laser linewidth to a certain slope of the feedback spectrum, so the narrower the feedback bandwidth of the fiber grating, the larger the slope of the feedback spectrum, the more sensitive the feedback. In addition, by changing the feedback power of FBG in the range of 0~1 mW, we observed that at the reflected power of 0.8 mW, the optical feedback narrowed the laser linewidth from the free-running 100.5 kHz to the narrowest 11.5 kHz, and at the reflected power of 1 mW, phase noise in the range of 0.2 kHz to 2 MHz is suppressed by about 22 dB.


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