Coherently Combined DFB Laser Array Chip With Reduced Relative Intensity Noise

The relative intensity noise (RIN) behavior of coherently combined DFB laser array by injection locking is experimentally investigated. A monolithically integrated four-element DFB laser array with a splitter and an output coupler is fabricated, and the frequency stabilities of the DFB lasers are im...

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Bibliographic Details
Published in:IEEE photonics technology letters 2021-09, Vol.33 (18), p.986-989
Main Authors: She, Xiaoyang, Xiong, Bing, Sun, Changzheng, Hao, Zhibiao, Wang, Jian, Wang, Lai, Han, Yanjun, Li, Hongtao, Luo, Yi
Format: Article
Language:English
Subjects:
Coherence
Coherently combined DFB laser arrays
Distributed feedback lasers
Fiber lasers
Frequency locking
injection locking
Laser arrays
Laser noise
Laser stability
Laser theory
Lasers
Measurement by laser beam
monolithic integration
Noise intensity
Relative intensity noise
Semiconductor laser arrays
Waveguide lasers
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Summary:The relative intensity noise (RIN) behavior of coherently combined DFB laser array by injection locking is experimentally investigated. A monolithically integrated four-element DFB laser array with a splitter and an output coupler is fabricated, and the frequency stabilities of the DFB lasers are improved to ensure a stable injection locking of DFB laser array by a master laser. It is demonstrated that the RIN of the coherently combined laser array is reduced by almost 20 dB at low frequencies compared with the free-running state. The results indicate that monolithic integration of DFB laser array under injection locking can help improve the RIN performance by eliminating variation in coupling delays and phase jitters.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2021.3075231