Numerical Investigation of a CNT-NALM-based Tm-Doped Fiber Laser

LIU Qingqing; ZHENG Jiancheng

doi:10.13756/j.gtxyj.2025.250115

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Numerical Investigation of a CNT-NALM-based Tm-Doped Fiber Laser

更新时间：2025-12-25

- Numerical Investigation of a CNT-NALM-based Tm-Doped Fiber Laser
- Study on Optical Communications Issue 6, (2025)
- 作者机构：
  
  a.三明学院　海外学院（外国语学院），福建　三明　365004
  b.三明学院　信息工程学院福建省农业物联网应用重点实验室，福建　三明　365004
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2025.250115
  CLC： TN929
- Received：11 April 2025，
  
  Revised：2025-05-20，
  
  Published：10 December 2025
- 稿件说明：
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刘青青，郑建城. 基于CNT-NALM的掺铥光纤激光器数值研究[J]. 光通信研究，2025(6): 250115.

Liu Q Q, Zheng J C. Numerical Investigation of a CNT-NALM-based Tm-Doped Fiber Laser[J]. Study on Optical Communications, 2025(6): 250115.
刘青青，郑建城. 基于CNT-NALM的掺铥光纤激光器数值研究[J]. 光通信研究，2025(6): 250115. DOI： 10.13756/j.gtxyj.2025.250115.

Liu Q Q, Zheng J C. Numerical Investigation of a CNT-NALM-based Tm-Doped Fiber Laser[J]. Study on Optical Communications, 2025(6): 250115. DOI： 10.13756/j.gtxyj.2025.250115.

摘要

【目的】

为实现2 μm波段高性能超快光纤激光输出，文章提出了一种融合碳纳米管（CNT）可饱和吸收体与非线性放大环形镜（NALM）的混合锁模掺铥光纤激光器（TDFL）。

【方法】

通过数值求解耦合复金兹堡-朗道方程，系统研究了泵浦功率和CNT可饱和吸收体参数对超短脉冲输出特性的调控机制。

【结果】

结果表明，在8字形腔结构中，主环路和NALM环路的增益饱和能量分别通过增强自相位调制效应和优化非线性相移补偿显著影响了孤子脉宽、光谱带宽及能量特性。CNT的调制深度和非饱和损耗通过抑制非线性相移和触发耗散相变来调控光谱滤波效应和孤子能量。该混合锁模机制对泵浦功率波动和损耗扰动展现出强鲁棒性。

【结论】

文章为2 μm波段高能量窄脉宽超快激光器的参数优化提供了理论依据。

Abstract

【Objective】

To achieve high-performance ultrafast fiber laser output in the 2 μm wavelength band

this study demonstrates a Thulium Doped Fiber Laser (TDFL) employing a hybrid mode-locking scheme integrating Carbon Nanotube (CNT) and a Nonlinear Amplifying Loop Mirror (NALM).

【Methods】

Through numerical simulations of coupled complex Ginzburg-Landau equations

we systematically investigate the modulation mechanisms of pump power and CNT saturable absorber parameters on ultrashort pulse output characteristics.

【Results】

The results reveal that the gain saturation energies in the main loop and NALM loop of the figure-eight cavity structure significantly affect the soliton pulse width

spectral bandwidth

and energy by enhancing the self-phase modulation effect and optimizing the nonlinear phase shift compensation

respectively. The modulation depth and non-saturation loss of CNT regulate the spectral filtering effect and soliton energy by suppressing nonlinear phase shift and triggering dissipative phase transition. The hybrid mode - locking mechanism demonstrates strong robustness against pump power fluctuations and loss perturbations.

【Conclusion】

This research provides theoretical support for parameter optimization of high-energy

narrow-pulse-width ultrashort pulse lasers in the 2 μm wavelength band.

关键词

Keywords

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北京邮电大学理学院北京　100876

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