Chinese Optics Letters, 2011, 9 (4): 041404, Published Online: Mar. 30, 2011   

Phase noise measurement of high-power fiber amplifiers Download: 871次

Author Affiliations
1 College of Opticelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China
2 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Abstract
We measure the phase fluctuation in a high-power fiber amplifier using a multi-dithering technique. Its fluctuation property is qualitatively analyzed by the power spectral density and integrated spectral density. Low frequency fluctuations caused by the environment are dominant in the phase fluctuations in an amplifier, whereas the high frequency components related to laser power affect the control bandwidth. The bandwidth requirement of the active phase-locking is calculated to be 300 Hz, 670 Hz, 1.6 kHz, and 3.9 kHz under the output power of 25, 55, 125, and 180 W, respectively. The approximately linear relationship between the control bandwidth and laser power needs to be further investigated.

Hu Xiao, Xiaolin Wang, Yanxing Ma, Bing He, Pu Zhou, Jun Zhou, Xiaojun Xu. Phase noise measurement of high-power fiber amplifiers[J]. Chinese Optics Letters, 2011, 9(4): 041404.

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