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Proceedings Paper

Efficient phase locking of two dual-wavelength fiber amplifiers by an all-optical self-feedback loop
Author(s): Bing Lei; Keshan Chen; Tianfu Yao; Jianhua Shi; Haojun Hu
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Paper Abstract

Efficient phase locking of two dual-wavelength fiber amplifiers has been demonstrated by using a self-feedback coupling and intracavity filtering configuration, and the effect of bandwidth and wavelength spacing on their phase locking performances have been investigated in experiment. Two independent fiber lasers with different operating wavelength were combined incoherently by a 3 dB fiber coupler to form a dual-wavelength seed source laser, which was injected into the fiber amplifiers’ coupling array through the self-feedback loop. The effect of bandwidth and wavelength spacing was researched by altering the seed laser’s pump power and operating wavelengths respectively. As long as the feedback loop and the single-mode fiber filtering configuration were well constructed in the unidirectional ring laser cavity, stable phase locking states and high fringe visibility interference patterns could always be obtained in our experiment. When the spacing of two operating wavelength was varied from 1.6 nm to 19.6 nm, the fringe visibility decreased slightly with the increase of wavelength spacing, and the corresponding fringe visibility was always larger than 0.6. In conclusion, we believe that efficient phase locking of several multi-wavelength laser sources is also feasible by passive self-adjusting methods, and keeping the component laser beams’ phase relationship stable and fixed is more important than controlling their operating wavelengths.

Paper Details

Date Published: 24 October 2017
PDF: 6 pages
Proc. SPIE 10457, AOPC 2017: Laser Components, Systems, and Applications, 104571Y (24 October 2017); doi: 10.1117/12.2284661
Show Author Affiliations
Bing Lei, National Univ. of Defense Technology (China)
Keshan Chen, National Univ. of Defense Technology (China)
Tianfu Yao, National Univ. of Defense Technology (China)
Jianhua Shi, National Univ. of Defense Technology (China)
Haojun Hu, National Univ. of Defense Technology (China)


Published in SPIE Proceedings Vol. 10457:
AOPC 2017: Laser Components, Systems, and Applications
Shibin Jiang; Lijun Wang; Lan Jiang; Long Zhang, Editor(s)

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