Influences of finite gain bandwidth on pulse propagating in parabolic fiber amplifiers with distributed gain profiles |
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Authors: | Zhao Jia-Sheng Li Pan Chen Xiao-Dong Feng Su-Juan Mao Qing-He |
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Affiliation: | a Anhui Provincial Key Laboratory of Photonics Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;b University of Science and Technology of China, Hefei 230026, China |
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Abstract: | The evolutions of the pulses propagating in decreasing and increasing gain distributed fiber amplifiers with finite gain bandwidths are investigated by simulating with the nonlinear Schrödinger equation. The results show that the parabolic pulse propagations in both the decreasing and the increasing gain amplifiers are restricted by the finite gain bandwidth. For a given input pulse, by choosing small initial gain coefficient and gain variation rate, the whole gain for the pulse amplification limited by the gain bandwidth may be higher, which is helpful to the enhancement of the output linearly chirped pulse energy. Compared to the decreasing gain distributed fiber amplifier, the increasing gain distributed amplifier may be more conducive to suppress the pulse spectral broadening and increase the critical amplifier length for achieving a larger output linearly chirped pulse energy. |
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Keywords: | finite gain bandwidth parabolic pulse linearly chirped pulse energy |
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