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  • Received: Jun. 15, 2020

    Accepted: Aug. 10, 2020

    Posted: Dec. 1, 2020

    Published Online: Nov. 17, 2020

    The Author Email: Jia Dongfang (jiadf@tju.edu.cn)

    DOI: 10.3788/CJL202047.1201006

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    Zhen Xu, Dongfang Jia, Zihao Li, Xu Sun, Chunfeng Ge, Zhaoying Wang, Tianxin Yang, Xiaodong Cao. Generation of Square Pulses at Both Anomalous and Normal Dispersion Regimes in Passively Mode-Locked Erbium-Doped Fiber Laser[J]. Chinese Journal of Lasers, 2020, 47(12): 1201006

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Chinese Journal of Lasers, Vol. 47, Issue 12, 1201006 (2020)

Generation of Square Pulses at Both Anomalous and Normal Dispersion Regimes in Passively Mode-Locked Erbium-Doped Fiber Laser

Xu Zhen1, Jia Dongfang1,*, Li Zihao1, Sun Xu1, Ge Chunfeng1, Wang Zhaoying1, Yang Tianxin1, and Cao Xiaodong2

Author Affiliations

  • 1Key Laboratory of Fiber Optics and Optical Communication, School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
  • 2Tianjin Optical Electrical Group Co., Ltd., Tianjin 300384, China

Abstract

The passive mode-locked erbium-doped fiber laser based on nonlinear optical loop mirror operating in the dissipative soliton resonance (DSR) region is reported. Square wave pulse output is obtained in the abnormal and normal dispersion regimes respectively. At anomalous dispersion regime, the net cavity dispersion is calculated to be -0.32ps 2. Stable square pluses with maximum temporal pulse duration of 33ns are obtained when the pump power is adjusted to 481.2mW. Correspondingly, the single pulse energy is 12.4nJ. Subsequently, a 7m long dispersion compensating fiber is employed to compensate the cavity dispersion to make the laser system work at the normal dispersion regime and the net cavity dispersion is 2.85ps 2. Under the same pump power, the maximum temporal duration of the square pulses is 34.3ns and the single pulse energy is 9.42nJ. It is shown that DSR square pulses can be generated at both anomalous and normal dispersion regimes under the conditions of balanced cavity parameters. Additionally, the influence of the pump power on the time domain width and single pulse energy of square wave pulse is also studied. The results show that the time domain width and single pulse energy of square wave pulse change linearly with the increase of pump power.

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