Influences of GVD on the characteristics of soliton in a passively mode-locked Er-doped fiber laser

In this paper, the characteristics of soliton in a passively mode-locked Er-doped fiber laser modeled by a non-distributed model are numerically investigated with the split-step Fourier method. Based on the analysis and model, sech2-shaped soliton is obtained by controlling the group velocity dispersion （GVD） and small-signal gain of the gain fiber. The law that the dispersion influences the characteristics of soliton in the mode-locked fiber laser is researched in net-cavity averaged anomalous dispersion regime.     

Dissipative Solitons characteristics in passively mode-locked Yb-doped fiber laser under limitation of gain saturation energy

This paper is devoted to research the characteristics of the dissipative solitons formed in a passively mode-locked Yb-doped fiber (YDF) laser under limitation of the gain saturation energy. The parabolic shape dissipative solitons with linear chirps are observed in the fiber laser. The influences of the gain saturation energy on pulse duration, peak power and single pulse energy of the dissipative solitons are investigated in-depth.     

C+L波段掺铒光纤被动锁模激光器

提出并证明了一种宽光谱被动锁模掺铒光纤激光器,为光学频率梳和光纤飞秒脉冲的产生奠定了基础。该激光器基于非线性偏振旋转的锁模机理,同时在大的正常色散区合理地将C波段和L波段掺铒光纤结合,确保激光器具有C+L波段的增益谱覆盖。当泵浦功率为350mW时,脉冲稳定的以基频4.32MHz运转,3dB带宽为60nm,20dB覆盖了1522~1630nm,实现了增益带宽内光谱的完全覆盖。这种利用增益拼接加宽光谱的方法可以有效避免光谱成分的非线性相位噪声,并且有利于进一步压窄脉冲。     

碳纳米管被动锁模光纤激光器的研究进展

单壁碳纳米管(SWCNTs)作为被动锁模材料具有许多优点:恢复时间快(＜1 ps)、饱和光强低、制各处理容易、成本低、工作光谱范围宽、化学稳定性好、与光纤兼容等,在超快激光器方面引起了人们的极大兴趣,并成功应用于固体、波导和光纤被动锁模激光器.本文对被动锁模超短脉冲光纤激光器的研究进展进行了综述,特别是对以单壁碳纳米管...     

Study on parameter optimization in a passively mode-locked Erbium-doped fiber laser

Optical soliton communication is the frontier research topic of optical fiber communication. In this paper, we study optical solitons generated by passively mode-locked Erbium-doped (Er-doped) fiber (EDF) laser. We analyze the variation of nonlinear equilibrium point parameter N of the passively mode-locked EDF laser in the role of group-velocity dispersion (GVD) and small-signal gain, and adjusting system parameter N is as close as to possible to 1. The ground state first-order optical soliton which generated through system parameter optimization of the passively mode-locked EDF laser will improve the efficiency and stability of optical soliton communication system. The research of this paper will have provided the theoretical foundation of parameter optimization in a passively mode-locked EDF laser. And it will be possible for the passively mode-locked fiber laser in optical fiber communication system to be applied from the laboratory stage to the practical application.     

石墨烯被动锁模光纤激光器的研究进展

自2009年石墨烯(Graphene)材料被成功用于产生超短脉冲以来,出现了多种腔形、多种波长、多种脉冲特性的锁模激光器。利用石墨烯可饱和吸收特性制成的锁模器件具有稳定性好、响应波长广、恢复时间短、插入损耗小等多方面的优势,是目前超短脉冲领域的研究热点。重点对石墨烯被动锁模光纤激光器的研究进展进行了总结,并针对该领域面临的问题,指出其发展趋势。     

被动锁模光纤激光器中双波长脉冲的产生

报道了从一个典型的基于非线性偏振旋转被动锁模光纤激光器中产生双波长锁模脉冲的研究。双折射诱导的波长相关腔传输使得激光器能同时在2个或多个波长上振荡,本文设计的激光器中最多有3个波长同时产生。由于偏振相关隔离器(PDI)引入的另外偏振相关腔损,通过调节偏振控制器(PC),3个波长中的任意2个能同时共振,并同时锁模。此外,双波长脉冲中2个不同波长的脉冲会相互作用,并通过交叉相位调制形成各种各样的调制格式。     

宽幅可调方波双泵被动锁模光纤激光器设计

用简单地调节泵功率的方法,实现了独立、连续地调整输出方波脉冲的振幅和宽度。采用了双泵结构,其中一个泵用来调节输出脉冲的宽度,另一个泵用来调整幅度;提出并实现了一种8字形双泵被动锁模光纤激光器。仿真结果表明,该被动锁模光纤激光器可以产生幅度可调的方波脉冲。这一结果将有助于纳秒方波脉冲机理的进一步研究。     

基于石墨烯的掺铒光纤锁模激光波长切换技术

报道了一种基于石墨烯锁模的全保偏掺铒光纤环形短腔实现锁模激光波长切换技术。利用多层石墨烯可饱和吸收镜不仅可实现被动锁模脉冲序列的稳定输出,并可通过三维精密调节,调制腔内信号损耗,有效控制不同波长激光的增益与损耗。实验表明,通过精密调制10层石墨烯膜可饱和吸收镜,在全保偏光纤激光短腔可实现波长1532 nm和1558 nm 处的锁模激光切换输出,并可实现这两波长附近的双波长锁模激光输出,线偏振度可达18 dB。     

被动锁模光纤激光器中增益支配孤子的腔至峰值功率钳位效应

通过实验和数值模拟研究了全正色散被动锁模光纤激光器中增益支配孤子的产生.实验观测和数值模拟结果分别证实了由腔导致的峰值功率钳位效应的存在.激光器性能对腔的结构的依赖性得到研究.研究结果表明:在光纤激光器中,能否获得具有更高脉冲能量的增益支配孤子是由腔的结构例如腔内非线性管理和输出比率选取决定的.     

一种全自动调节的锁模光纤激光器

通过在非线性偏振旋转环形腔中引入一种全光纤化的角度可调的起偏器,简化了被动锁模光纤激光器的结构,通过调节环形腔内的光纤起偏器和1/4波片的角度就能够实现锁模脉冲的输出。基于此简化结构,引入基于单片机的触发反馈电路,控制偏振片和波片的旋转状态,实现了腔内锁模脉冲的自动调节输出,得到平均功率为8mW的、重复频率为5.6 MHz的全自动锁模脉冲稳态输出。     

基于SESAM的被动调Q光纤光栅掺铒光纤激光器

提出并研究了一种线性腔结构的基于 SESAM(半导体可饱和吸收镜)的被动调 Q光纤光栅掺铒光纤激光器,该激光器无需采用偏振控制器控制激光偏振态,简化了调 Q 激光器的结构。该激光器的中心波长为1549.975 nm,阈值功率为143 mW,斜效率为1.2%。当泵浦功率从149 mW增加到180 mW时,脉冲重复频率从5.431 kHz增加到9.778 kHz。当泵浦功率为155 mW时,激光脉冲的能量为5.6 nJ,重复频率为6.538 kHz,脉冲宽度为40μs。     

一种可调谐掺铒光纤激光器的研究

文章基于掺铒光纤在1 550 nm波段的增益特性,利用光纤光栅作为调谐装置,设计了可调谐光纤光栅激光器的简单结构,通过改变光纤光栅的温度对光纤激光嚣的波长进行了调谐.更重要的是实验分析了不同掺铒光纤长度对激光输出功率的影响,在温度为25℃时,实验中分别取10、20和30 m 3种不同光纤长度进行了测试,结果表明,不同长度的掺铒光纤,其阀值不同.     

全正色散被动锁模掺镱全光纤环形激光器

采用976 nm半导体激光器为泵浦源,高掺杂Yb3+光纤为增益介质,利用非线性偏转效应实现被动锁模.得到了中心波长为1046 nm,光谱宽度为24 nm,脉冲宽度为54 ps,平均输出功率为93 mW的超短脉冲.通过缩短腔长,获得了较高的重复频率,达到41 MHz.     

掺Er石英光纤的1560nm光纤激光和超荧光

用Ar离子514.5nm激光泵浦掺Er石英光纤产生了1560nm的激光和超荧光输出。激光最大输出功率5.4mW,斜率效率9.5％;超荧光最大输出功率1.6mW,并观察到光纤超荧光的谱窄化现象。     

被动锁模光纤激光器中实时动力学特性的研究进展

超快、非重复现象的实时测量在很多领域具有较强的挑战性,新兴的色散傅里叶变换(DFT)技术克服了传统光学仪器扫描速率的限制,使实时光谱测量成为可能。本文介绍了基于DFT技术的被动锁模光纤激光器实时动力学特性的研究进展,其将有助于研究者对激光器中孤子爆炸、脉动孤子、孤子产生和消亡、类噪声脉冲等各种动力学现象的深入理解,对其优化光纤激光器特性具有重要启示。     

基于石墨烯可饱和吸收的锁模光纤激光器研究

报道了一种基于单层石墨烯可饱和吸收体调Q锁模的全保偏结构掺铒光纤激光器。研究了单层石墨烯作为可饱和吸收体实现调Q锁模后的激光特征,获得了中心波长1557.69 nm的激光输出。调Q锁模脉冲包络重复频率11.49~40.41 kHz范围变化,包络宽度在10.1~3.62 μs范围变化。在泵浦功率为191.3 mW时,激光器最大输出平均功率9.354 mW,最大光-光转换效率为4.89 %。     

Study on the chaotic dynamics of the mode-locked fiber ring laser

In this paper, we study the chaotic dynamics of the mode-locked fiber laser by numerical simulation. The structures of the passively mode-locked fiber laser and the actively mode-locked fiber laser are studied by modeling and analysis. By appropriately adjusting the small signal gain of the optical fiber amplifier, we observe the period-doubling bifurcations and route to chaos in the passively mode-locked fiber laser based on nonlinear polarization rotation effect. Chaos in the actively mode-locked erbium-doped fiber laser is obtained by adjusting the elliptic modulus parameter of the active modulator and the intra-cavity length. Simulation results have theoretical significance for the practical application of chaotic soliton communication.     

一种主动锁模光纤激光器稳定性的新方法

介绍了光码分复用通信系统中超短脉冲光源的重要性,并对主动锁模光纤环型激光器的稳定性问题进行了分析,然后介绍了解决长期稳定性的两种常用方法,最后提出了一种利用温控来解决长期不稳定性的新方法.     

Manipulating dissipative soliton ensembles in passively mode-locked fiber lasers

We review our recent experimental and theoretical results addressing the dynamics of large numbers of solitons interacting in presence of a background in passively mode-locked erbium-doped fiber lasers. We first characterize experimentally the soliton rain complex dynamics, and then we focus on ordered soliton patterns. We report that, for suitable experimental parameters, a continuous wave can impose harmonic mode locking. Two levels of modeling for a mode-locked laser subjected to the external injection of a continuous wave are developed to support the latter observation. The first one is based on a scalar master equation, while the second one takes into account the mode-locking mechanism more accurately through a vectorial approach.