测量光纤放大器小信号增益谱的一种简便方法

提出了一种用小功率宽带光源较精确测量光纤放大器小信号增益谱的方法。数值模拟表明 ,该方法是完全可行的 ,并且实验结果与数值模拟结果一致。该方法具有简便、易操作的特点。     

ZnS:Er量子点材料制备及其受激发光特性研究

在水性介质中，制备了ZnS：Er量子点，并对其的X射线（XRF）谱、X射线衍射（XRD）谱、透射电子显微镜（TEM）图像和光致发光（PL）谱进行了研究，确定了所制备的ZnS：Er量子点材料中Er的浓度，观测到ZnS：Er量子点呈粒径为4nm的近球型结构。利用LD激发，在LD不同电流强度下得到ZnS：Er量子点从波长1500nm到1650nm的宽谱发射，并随着电流强度的增加ZnS：Er量子点的发射强度明显增加，当电流强度达到1．5A时，1545nm波长处的发射峰更明显。     

光纤布拉格光栅的半金属管封装及挠度实验研究

本文提出了一种基于光纤布拉格光栅的半金属管封装方案 ,利用标准悬臂梁进行了挠度试验测量 .结果表明 ,用半金属管封装技术可以使光纤光栅感测的实验值更接近理论计算值 .封装后的实验测量值可达到理论值的94 %以上 ,FBG的挠度传感灵敏度约为± 0 .0 2 ,其对称性亦很好 ,线性拟合度分别达到 0 .995 8和 0 .9977.     

基于FBG的多级延迟SBS结构的慢光系统研究

设计一种基于光纤布拉格光栅(FBG)的多级延迟受激布里渊散射(SBS)结构的慢光系统.实验中采用2个FBG和一段15 km标准单模光纤(SSMF),利用光栅不同的反射特性,使信号光和泵浦光可重复通过同一段光纤相互作用,在仅使用一段光纤情况下达到双级时延的效果,并且FBG对信号光同样具有一定的延迟.实验结果表明,在展宽S...     

偏振无关的全光纤窄带通梳状滤波器

提出了一种基于二阶高双折射光纤(HBF)Sagnac环Sagnac环镜的全光纤窄带通梳状滤波器。二阶HBFSagnac环镜由单环构成,环中包含2段HBF。对照由2个一阶HBFSagnac环镜级联实现的窄带通梳状滤波器,进行了理论推导和试验证明。结果表明,当二阶HBFSagnac环镜中的2段HBF的长度设定为L1∶L2=1∶2,入射光与HBF快轴间的夹角为θ1+θ3=45°、θ2=45°时,实现了类似于2个一阶HBFSagnac环镜级联的传输谱,具有窄带通和宽信道间隔的特点。与对照的方案相比,边模抑制比高出3dB,此外还具有插入损耗低、实现简单等优点。理论推导与实验结果吻合。     

Multimode oscillation Q-switched erbium-doped fiber laser with a few-mode fiber cavity

We propose and demonstrate experimentally a multimode oscillation Q-switched erbium-doped fiber laser with a few-mode fiber cavity. The different coupling processes of reflection peaks of fiber Bragg gratings (FBGs) which act as cavity mirrors allow the different oscillating states. We obtain microsecond light pulse output states whose oscillation and output beams have different mode compositions, including high order mode. Such a structure enables the high order mode oscillation in the whole cavity with an all-fiber structure, which has potential applications in mode-division multiplexed systems and research of multimode nonlinear effect.     

Fiber laser twist sensor with hybrid few-mode tilted Bragg grating and few-mode long period grating

A twist sensor with hybrid few-mode tilted fiber Bragg grating (FM-TFBG) and few-mode long period grating (FM-LPG) in fiber laser cavity is demonstrated. The FM-LPG is utilized to excite LP11 core mode. The FM-TFBG is used for sensing. The transverse modes at 1 553.9 nm and 1 550.5 nm are LP01 and LP21 core modes, respectively, which are coupled from forward-propagating LP11 core mode. These two excitation wavelengths have opposite variation tendencies, which participate in sensing. The twist sensitivity of 0.16 dB/° from ?40° to 40° is achieved. The proposed sensor has potentially used for structure monitoring in many areas.     

微结构光纤激光器件

由于微结构光纤灵活多变的结构特点,使得以其为增益介质的光纤激光器件,具有比普通光纤激光器件更加优异的性能.本文结合国际上微结构光纤激光器件的最新研究进展情况,概述了微结构光纤作为增益介质的独特特性、微结构光纤激光器件的理论分析方法和掺铒、掺镱以及喇曼微结构光纤激光器件的特点.     

Nonlinear propagation of pulses in multimode fiber with strong linear coupling

Multimode fiber has a richer spatial dimension than single-mode fiber, and is an ideal platform for studying many novel nonlinear effects. We established a strong linear coupling and short-range fiber model to understand the interactive effects of linear coupling and nonlinear effects. We find that strong linear coupling can compensate for the group delay between eigenmodes and cause energy fluctuation between modes which weakens the nonlinear effects. In high energy pulses, the interaction of linear coupling and nonlinear effects can help producing weak dispersion waves when the spectrum is broadened. Since linear coupling in a mode group is common and unavoidable, these results may provide a certain theoretical explanation for multi-mode nonlinear phenomena.     

时间拉伸色散傅里叶变换在被动锁模光纤激光器研究中的应用

时间拉伸色散傅里叶变换(TS-DFT)技术推动了锁模激光器中瞬态现象的研究,对于揭示复杂系统中的耗散动力学过程具有重要意义。介绍了TS-DFT技术的基本原理及其在数据采集和数据处理中存在的关键问题,总结了TS-DFT技术在被动锁模光纤激光器的类噪声脉冲与怪波、孤子爆炸、孤子束缚态、锁模自启动和矢量孤子等各类超快现象研究中的应用。