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	Theory of noise in a kilo-Hz cascaded high-energy Yb-doped nanosecond pulsed fiber amplifier
	Liu M(刘明) ; Zhang HT(张海涛) ; Gong ML(巩马理) ; Zhao YJ(赵跃进) ; Cheng WY(程文雍) ; Meng K(孟阔) ; Zheng C(郑超) ; Chen YZ(陈倚竹) ; Liu Ming ; Zhang Hai-Tao ; Gong Ma-Li ; Zhao Yue-Jin ; Cheng Wen-Yong ; Meng Kuo ; Zheng Chao ; Chen Yi-Zhu
	2016-03-30 ; 2016-03-30
关键词	pulsed fiber amplifier signal-to-noise ratio cascaded amplifier master oscillator power amplifier TN722
其他题名	Theory of noise in a kilo-Hz cascaded high-energy Yb-doped nanosecond pulsed fiber amplifier
中文摘要	A theoretical analysis of noise in a high-power cascaded fiber amplifier is presented. Unlike the noise theory in low power communication, the noise of a high power system is redefined as the leaked output energy between pulses with coherent beat noise uncounted. This definition is more appropriate for high power usage in which the pulse energy receives more attention than the pulse shape integrity. Then the low power pre-amplifying stages are considered as linear amplification and analyzed by linear theory. In the high-power amplification stages, the inversion is assumed to recover linearly in the time interval between pulses. The time shape of the output pulse is different from that of the input signal because of different gains at the front and back ends of the pulse. Then, a criterion is provided to distinguish the nonlinear and linear amplifications based on the signal-to-noise ratio(SNR) analysis. Then, an experiment that shows that the output SNR actually drops off in nonlinear amplification is performed. The change in the noise factor can be well evaluated by pulse shape distortion.; A theoretical analysis of noise in a high-power cascaded fiber amplifier is presented. Unlike the noise theory in low power communication, the noise of a high power system is redefined as the leaked output energy between pulses with coherent beat noise uncounted. This definition is more appropriate for high power usage in which the pulse energy receives more attention than the pulse shape integrity. Then the low power pre-amplifying stages are considered as linear amplification and analyzed by linear theory. In the high-power amplification stages, the inversion is assumed to recover linearly in the time interval between pulses. The time shape of the output pulse is different from that of the input signal because of different gains at the front and back ends of the pulse. Then, a criterion is provided to distinguish the nonlinear and linear amplifications based on the signal-to-noise ratio(SNR) analysis. Then, an experiment that shows that the output SNR actually drops off in nonlinear amplification is performed. The change in the noise factor can be well evaluated by pulse shape distortion.
语种	英语 ; 英语
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/144533]
专题	清华大学
推荐引用方式 GB/T 7714	Liu M,Zhang HT,Gong ML,et al. Theory of noise in a kilo-Hz cascaded high-energy Yb-doped nanosecond pulsed fiber amplifier[J],2016, 2016.
APA	刘明.,张海涛.,巩马理.,赵跃进.,程文雍.,...&Chen Yi-Zhu.(2016).Theory of noise in a kilo-Hz cascaded high-energy Yb-doped nanosecond pulsed fiber amplifier..
MLA	刘明,et al."Theory of noise in a kilo-Hz cascaded high-energy Yb-doped nanosecond pulsed fiber amplifier".(2016).

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