Shiping Xiong

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Lian Zhou

Guangxi University of Finance and Economics

Daping Luo

East China Normal University

Gehui Xie

East China Normal University

Zejiang Deng

East China Normal University

Wenxue Li

Guilin University of Electronic Technology

GU Cheng-lin

Nanjing Tech University

Zilin Zhao

East China Normal University

Wenxue Li

East China Normal University

Wenchao Wang

Cornell University

Yang Liu

Shenzhen Children's Hospital

Cooperative Institutions

East China Normal University

Huazhong University of Science and Technology

Lanzhou University

Minzu University of China

Shanxi University

Shanghai Jiao Tong University

Nanjing Tech University

Chinese University of Hong Kong

Shandong Normal University

Shanxi University of Traditional Chinese Medicine

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Low-noise compact fiber laser based on nonlinear polarization evolution in an all-polarization-maintaining figure-8 cavity

Chinese Optics Letters (2024)

Lian Zhou Daping Luo Gehui Xie Shiping Xiong Haipeng Lou

10.3788/col202422.071402

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Investigation of stable pulse mode-locking regimes in a NALM figure-9 Er-doped fiber laser

Optics Express (2022)

Shiping Xiong Daping Luo Yang Liu Wenchao Wang Zejiang Deng

We demonstrate three typical mode-locking processes of a nonlinear amplifying loop mirror (NALM) fiber laser via a general nonlinear Schrödinger equation-based (GNLSE) simulation model. First, the pulse evolutions in the NALM cavity were separately simulated under asymmetric and weakly asymmetric conditions. We found that the splitting ratio and positions of the gain fiber can result in a suitable phase bias between clockwise and counter-clockwise beams, enabling the realization of a self-starting low-threshold operating condition. To assess the roles of the splitting ratio and gain in the mode-locking process, we simulated three pulse formation processes: in the soliton, stretched-pulse, and dissipative soliton mode-locking regimes. The simulation results show that the splitting ratio, gain, and dispersion directly influence the mode-locking condition and pulse characteristics, thereby providing effective quantified guidance for high-quality pulse generation. Finally, an experimental NALM oscillation operating under stretched pulse conditions was established to investigate the impact of the splitting ratio and pump power on the pulse characteristics. The experimental results prove that the splitting ratio, gain, and dispersion can be used to manipulate the mode-locking threshold, self-starting threshold, nonlinear effects, and pulse characteristics.

Mode-Locking

10.1364/oe.476630

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Passive Noise Suppression in Yb-Doped Fiber Amplifier Based on Nonlinear Amplifying Loop Mirror

SSRN Electronic Journal (2022)

Tang ZhenQiang Daping Luo Lian Zhou Gehui Xie GU Cheng-lin

We investigated the frequency-dependent transfer function of amplitude noise in an all-polarization-maintaining Yb-doped fiber amplifier based on nonlinear amplifying loop mirror (NALM). We generated artificially designed amplitude noise in laser by adding weak sinusoidal modulation into the seed pulses and pump. After transmitting through the NALM-based amplifier, we obtained the amplitude-frequency and phase-frequency responses of the amplitude noise at different gains. Systematic measurements indicate that pump power optimization in the NALM-based amplifier suppresses the amplitude noises from the signal pulses and amplification pump, achieving suppression ratios exceeding 12.7 and 23.0 dB, respectively, with a simultaneous signal amplification ratio reaching 10.0 dB. Moreover, the output noise characteristics confirm that the NALM-based amplifier exhibits broadband amplitude noise and phase noise suppression. Clarifying the mechanism and bandwidth of this amplifier is necessary for low-noise laser generation because it provides insight into the nonlinear laser dynamics of broadband passive noise suppression and signal amplification.

10.2139/ssrn.4264258

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