15波长输出的布里渊掺铒光纤激光器

多波长布里渊掺铒光纤激光器是一种新型的多波长光纤激光器,其原理是利用受激布里渊增益和掺铒光纤的线性增益,可以在常温下得到波长间隔约为0．08nm(～10GHz)的多波长输出。报道的布里渊掺铒光纤激光器,在布里渊抽运功率为1．7mW、980nm抽运功率为300mW的情况下得到稳定的15个波长(间隔～10GHz)的输出,这种激光器用作光传感器、光谱分析仪以及密集波分复用系统的光源。实验发现,输出波长的个数随着980nm抽运功率的增大而增加。另外,布里渊掺铒光纤激光器的信号功率主要来自于掺铒光纤的增益,而布里渊增益对它的影响不大。     

四波混频增强多波长布里渊掺铒光纤激光器的实验研究

提出一种利用四波混频增强多波长布里渊掺铒光纤激光器的方法,在激光器中使用色散位移光纤作为布里渊增益介质,通过布里渊多波长之间四波混频效应提供的参变增益展宽激光器的有效增益谱,产生高阶斯托克斯光和反斯托克斯光,增加多波长的数目并改善输出功率.分析了激光器中掺铒光纤放大器功率和布里渊抽运功率对四波混频增强效果的影响,在98...     

间隔0.173nm的可调谐多波长布里渊掺铒光纤激光器

使用四端口环行器和可调谐滤波器,设计了一种间隔为双倍布里渊频移的多波长布里渊掺铒光纤激光器.该光纤激光器中使用的四端口环形器可以限制奇次阶斯托克斯光在腔内循环并耦合输出初始泵浦光和偶次阶斯托克斯光,而可调滤波器抑制环形腔所形成的自激振荡模,增加了激发多波长激光的功率,从而增加多波长输出个数及其调谐范围.在布里渊泵浦功率为8dBm、980nm泵浦功率为279mW时,实验获得波长间隔为0.173nm的6个波长的激光输出,输出激光的可调谐范围为28nm.     

单纵模布里渊掺铒光纤激光器的实验研究

提出了一种具有多环形腔(MRC)和光纤布拉格光栅可调谐滤波器(FBG-TF)相结合的单纵模布里渊掺铒光纤激光器(BEDFL).实验中通过观察激光器输出光的拍频信号分析其光谱精细结构,分别讨论了布里渊增益、FBG-TF、MRC对BEDFL单模输出的贡献,给出了激光器的功率特性曲线和波长稳定性测试图.实验得到了在1550 nm处功率为4 dBm,信噪比(SNR)>60 dB,线宽小于1.5 kHz的稳定单纵模输出光.     

基于受激布里渊散射的波长间隔可变多波长光纤激光器

提出了一个基于自激发受激布里渊散射的波长间隔可变多波长光纤激光器.利用单模光纤中自激发产生的非线性布里渊增益和掺铒光纤的线性增益组成混合增益光纤激光器,从而使光纤激光器在室温下产生稳定的多波长输出.改变双折射光纤环镜滤波器中保偏光纤的长度,可以实现波长间隔可变多波长激光产生,提高了多波长光纤激光器操作的灵活性和实用性.实验实现了波长间隔从0.8nm至0.076nm可变的多波长激光产生,波长数随波长间隔减小而增加,间隔为0.08nm的激光波长数达86.     

基于受激布里渊散射的波长间隔可变多波长光纤激光器

提出了一个基于自激发受激布里渊散射的波长间隔可变多波长光纤激光器.利用单模光纤中自激发产生的非线性布里渊增益和掺铒光纤的线性增益组成混合增益光纤激光器,从而使光纤激光器在室温下产生稳定的多波长输出.改变双折射光纤环镜滤波器中保偏光纤的长度,可以实现波长间隔可变多波长激光产生,提高了多波长光纤激光器操作的灵活性和实用性.实验实现了波长间隔从0.8 nm至0.076 nm可变的多波长激光产生,波长数随波长间隔减小而增加,间隔为0.08 nm的激光波长数达86.     

布里渊-掺铒光纤随机光纤激光器输出特性分析

设计了一种基于受激布里渊散射和掺铒光纤混合增益的随机光纤激光器,该激光器选用两段长为20km的单模光纤组成全开放腔结构,利用单模光纤的瑞利散射提供随机光反馈.研究表明,固定布里渊泵浦波长和泵浦功率分别为1 550.00nm和2.19mW时,增加掺铒光纤泵浦功率,可以实现两个波长的随机激光输出,一阶和二阶受激布里渊散射光与布里渊泵浦光波长间隔分别约为0.088nm和0.174nm,产生一阶和二阶受激布里渊散射对应的掺铒光纤泵浦功率分别为190mW和370mW;当掺铒光纤泵浦功率为433mW时,激光器两端的最大输出功率为1.60mW和1.68mW.当掺铒光纤泵浦功率明显高于阈值功率时,获得的一阶和二阶随机激光输出稳定,3dB线宽约为0.022nm,峰值强度和位置基本不随时间而变化.     

掺铒石英光纤中的受激布里渊散射

本文报导用染料调Ｑ红宝石激光（波长λ＝６９４．３ｎｍ）泵浦掺Ｅｒ３＋石英光纤进行的受激布里渊散射（ＳＢＳ）实验研究。测量了受激布里渊散射频移，计算出掺铒石英光纤的体压缩系数。探讨了掺铒光纤中的受激布里渊散射的应用前景。     

利用单模光纤中SBS效应进行被动调Q的掺铒光纤激光器研究

分析了利用光纤中的受激布里渊散射(SBS)相位共轭效应进行激光腔内调Q,产生ns量级脉冲激光的原理,并对利用该效应产生的激光脉冲波形和脉冲形成过程进行了数值模拟,得到的脉冲波形与SBS相位共轭反射率随时间变化曲线基本一致,表明利用光纤中的SBS相位共轭作用调Q具有可行性。据此,对采用单模光纤(SMF)作为SBS池的掺Er3＋调Q光纤激光器进行实验研究,当单模光纤长度为1.5 m时,在45 mW的抽运光功率下得到脉宽约2.6 ns,脉冲周期58.23 ns,平均功率7.35 mW的激光脉冲。进一步的研究表明：激光器中相位共轭镜的形成与SBS介质长度有关,SBS介质过长,斯托克斯线之间无固定的相位关系,不能形成相干叠加,SBS相位共轭腔不能形成; SBS介质过短,腔内正交偏振模光子寿命的改变使脉冲出现双峰现象。脉冲形成后其属性只与SBS动态属性有关。     

Modeling of Multi-Wavelength Brillouin Fiber Laser Based on Analytical Solutions in a Linear Cavity

Abstract

In this article, an accurate model of multi-wavelength Brillouin fiber laser is developed by analytically solving cascade-stimulated Brillouin scattering equations in a linear cavity. The dependence of Stokes signal power on the incident pump power and the successive reflected transmitted powers is calculated. Furthermore, an analytical approach that can be used to predict the generated Stokes signals power is derived. Finally, this derived model is checked with experimental results that show significant agreement with the analytical solution of the model.     

An Efficient Photonic Crystal Fiber-Based Brillouin Erbium Fiber Laser Using a Fiber Bragg Grating for Multi-Wavelength Generation

Abstract

An efficient multi-wavelength Brillouin erbium fiber laser is demonstrated using an improved configuration with a broadband fiber Bragg grating and a piece of photonic crystal fiber. The laser generates more than 55 lines of optical comb with a line spacing of approximately 0.09 nm in a 1,565-5 nm region using pump powers of 3 dBm and 150 mW for the Brillouin and 980-nm pumps, respectively. The Brillouin erbium fiber laser with a fiber Bragg grating's reflectivity of 50% obtained a higher number of comb lines compared to that of 99% reflectivity.     

Two-Frequency Brillouin Fiber Laser Based on Bragg Grating Fabry-Perot Cavity

A novel and simple two-frequency Brillouin fiber laser is presented. It is based on a fiber Fabry-Perot cavity with fiber Bragg gratings as reflectors. The model of stimulated Brillouin scattering in fiber grating-based Fabry-Perot resonator is investigated. The laser allows conversion efficiency of close to 100% and suppresses the higher-order Stokes waves. The theoretical prediction is presented and the experimental demonstration is realized.     

Two-Frequency Brillouin Fiber Laser Based on Bragg Grating Fabry-Perot Cavity

Abstract

A novel and simple two-frequency Brillouin fiber laser is presented. It is based on a fiber Fabry-Perot cavity with fiber Bragg gratings as reflectors. The model of stimulated Brillouin scattering in fiber grating–based Fabry-Perot resonator is investigated. The laser allows conversion efficiency of close to 100% and suppresses the higher-order Stokes waves. The theoretical prediction is presented and the experimental demonstration is realized.     

Two-Frequency Brillouin Fiber Laser Controlled by Temperature Difference in Fiber Ring Resonator

A Brillouin fiber laser (BFL) consisting of a fiber ring resonator with different fiber temperatures emits two-frequency light output. The two-frequency BFL yields an optical beat output which can be utilized as an optical frequency shifter. The output beat frequency is controllable by the temperature difference in the fiber ring resonator and changes with a step of a resonant frequency interval of BFL. The temperature dependence of the BFL output frequency was 2.4 MHz/°C. The stability of the output beat frequency to the temperature fluctuation was estimated as 1.04°C/2.5 MHz.     

An Enhanced Bismuth-Based Brillouin/Erbium Fiber Laser with Linear Cavity Configuration

A multi-wavelength Brillouin/erbium-doped fiber laser (BEFL) which operates in 1594 nm region is demonstrated using a 215 cm long Bismuth-based EDF and SMF. Two optical circulators were used at the output ends of the system to form a linear cavity to produce a cascaded Brillouin Stokes and anti-Stokes. A stable output laser comb of more than 20 lines was obtained with a spacing of approximately 0.089 nm at a Brillouin pump power of 4 dBm and two 1,480-nm pumps at powers of 100 mW. The number of lines is relatively higher compared with the ring cavity BEFL.     

基于光纤中SBS相位共轭的自调Q光纤激光器

分析了利用光纤中的受激布里渊散射(stimulated Brillouin scattering,SBS)相位共轭效应进行激光腔内调Q,产生ns量级脉冲激光的原理,并对利用该效应产生的激光脉冲波形和脉冲形成过程进行了数值模拟,得到的脉冲波形与SBS相位共轭反射率随时间变化曲线基本一致,表明利用光纤中的SBS相位共轭作用调Q具有可行性.据此,对采用单模光纤(single-mode fiber,SMF)作为SBS池的Er³⁺掺杂调Q光纤激光器进行实验研究.当单模光纤长度为1.5 m时,在45 mW的光抽运功率下得到脉宽约2.6ns,脉冲周期58.23ns,平均功率7.35mW的激光脉冲.进一步的研究表明:激光器中相位共轭镜的形成与SBS介质长度有关,SBS介质过长,斯托克斯线之间无固定的相位关系,不能形成相干叠加,SBS相位共轭腔不能形成;SBS介质过短,腔内正交偏振模光子寿命的改变使脉冲出现双峰现象.脉冲形成后其属性只与SBS动态属性有关.