Kuanglu Yu, Linghao Cheng, Yiqin Lao, Yunbo Li, Bai-Ou Guan, Chongqing Wu, Yao Zhao. Impact of external optical feedback on the beat notes of dual-polarization fiber lasers[J]. Chinese Optics Letters, 2017, 15(7): 070604
- Chinese Optics Letters
- Vol. 15, Issue 7, 070604 (2017)
Fig. 1. Schematic of a dual-frequency fiber laser with external optical feedback by an FBG reflector.
Fig. 2. Experimental setup for dual-frequency fiber laser beat note’s frequency stabilization. The laser can be either connected with Structure A or B as the feedback element.
Fig. 3. Phase noise spectrum with different feedback lengths. Inset: a free-running DBR output on the BOSA.
Fig. 4. Phase-noise reduction at 10 kHz offset with different feedback lengths.
Fig. 5. Beat spectra for different feedback lengths.
Fig. 6. Mode gap dependence on the feedback length.
Fig. 7. Beat spectra for different feedback strengths.
Fig. 8. Measured beat frequency offset by changing the feedback light’s polarization.
Fig. 9. Experimental setup for feedback’s impact on DBR sensitivity.
Fig. 10. DBR sensitivity comparison before and after optical feedback.
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