饱和吸收体恢复时间对正交偏振耗散孤子的影响

何晓颖; 张川; 张银东; 饶岚

doi:10.37188/CO.EN-2023-0032

饱和吸收体恢复时间对正交偏振耗散孤子的影响

北京邮电大学电子工程学院, 互联与融合北京市重点实验室, 北京 100876

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中图分类号: O436.3
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出版历程
- 收稿日期: 2023-12-15
- 网络出版日期: 2024-04-17

Influence of SA recovery time on orthogonally polarized dissipative solitons

doi: 10.37188/CO.EN-2023-0032

School of Electronic Engineering and Beijing Key Laboratory of Space-Ground Interconnection and Convergence, Beijing University of Posts and Telecommunications, Beijing 100876, China

Funds: Supported by National Natural Science Foundation of China (No. 61675046, No. 61935005)

More Information

Author Bio:
Xiaoying He (1981—), female, born in Jingzhou, Hubei. She received her Ph.D. degree from the Huazhong University of Science and Technology in 2009. She now works as an associated investigator at the Beijing University of Posts and Telecommunications. Her main research interests include semiconductor optoelectronic devices, neural synaptic devices, fiber mode-locking lasers, and beam shaping. E-mail: xiaoyinghe@bupt.edu.cn

Corresponding author: xiaoyinghe@bupt.edu.cn

摘要

摘要:
偏振在脉冲锁模时，对其塑形和稳定起着至关重要的作用。在本研究中，我们开发了一种用于产生正交偏振耗散孤子的被动锁模石墨烯光纤激光器的正交偏振数值模拟。重点是分析由偏振依赖的石墨烯微光纤饱和吸收体引起的净正常色散双折射腔对正交偏振孤子的影响。研究结果表明，这种饱和吸收体的恢复时间显著影响正交偏振耗散脉冲的特性，如能量、脉宽、时间带宽乘积和啁啾。结果显示，其恢复时间为120飞秒时最佳，产生两个具有大啁啾的正交偏振的窄耗散孤子脉冲，分别约为7.47和8.06皮秒。这对于开发紧凑、高功率、偏振耗散孤子光纤激光系统具有重要意义。
- 正交偏振光 /
- 被动锁模 /
- 净正常色散腔 /
- 恢复时间
Abstract:
Polarization is a crucial factor in shaping and stabilizing mode-locking pulses. This study develops an orthogonally polarized numerical modeling of passive mode-locked graphene fiber lasers for generating orthogonally polarized dissipative solitons (DSs). The focus is on analyzing the influence of orthogonal polarization in this net-normal dispersion birefringent cavity caused by the polarization-dependent graphene microfiber saturable absorber. The research results demonstrate that the recovery time of such saturable absorbers significantly affects the characteristics of the orthogonally polarized DSs’ output pulses, including energy, pulse width, time-bandwidth product, and chirps. Results show that its recovery time of 120 fs is optimal, producing two orthogonally polarized narrow dissipative soliton pulses with large chirps of about 7.47 and 8.06 ps. This has significant implications for the development of compact, high-power, polarized dissipative soliton fiber laser systems.
- orthogonal polarization /
- passive mode-locking /
- net-normal dispersion /
- recovery time

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Figure 1. Schematic diagram of Polarization-locked mode-locked fiber laser

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Figure 2. Change of the output pulses and spectrum calculated with an increase of the net cavity GVD from 0.01 ps² to 0.1 ps² (a) Output pulses of X-polarized. (b) Output spectrum of X-polarized. (c) Output pulses of Y-polarized. (d) Output spectrum of Y-polarized.

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Figure 3. Results from numerical simulation of orthogonally polarized dissipative soliton showing the temporal evolution of the pulse in the cavity

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Figure 4. (a) The influence of recovery time on the pulse width of the two orthogonal polarization components. (b) The effect of recovery time on the modulation depth for the two polarization directions. (c) The impact of recovery time on the output pulse energy of the two polarized pulses. (d) The effect of recovery time on the output pulse chirp of two polarization directions.

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Figure 5. Pulse formation mechanisms with different recovery times (a) the recovery time of 70 fs (b) the recovery time of 120 fs (c) the recovery time of 1700 fs.

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Table 1. Different cavity lengths and their corresponding total net cavity dispersion.

EDF L (m)	SMF L (m)	Entire Cavity L (m)	Net Cavity GVD (ps²)
2	3	5	0.01
2.8	3	5.8	0.058
3.2	3	6.2	0.081
3.55	3	6.55	0.1

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Table 2. The output pulse parameters associated with different cavity lengths

Net Cavity GVD (ps²)	X-polarized 3 dB Pulse Width (ps)	Y-polarized 3 dB Pulse Width (ps)	X-polarized 3 dB Spectrum Width (nm)	Y-polarized 3 dB Spectrum Width (nm)
0.01	9.52	10.18	12.34	12.15
0.058	10.43	11.2	13.83	13.94
0.081	11.17	11.69	13.04	14.06
0.1	11.94	11.87	15.13	14.67

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