一种新型的CG—DBR光纤激光器

利用耦合模理论和数值方法，对高斯型耦合系数线性啁啾光栅分布布喇格反射（ＣＧ－ＤＢＲ）结构光纤激光器的特性进行了分析，得到了阈值增益和纵膜谱，并与均匀光栅，常耦合系数线性啁啾光栅ＤＢＲ光纤激光器进行了比较。为进一步的设计与制作提供了理论指导。     

DBR掺饵光纤激光器的功率特性研究

本文主要研究ＤＢＲ掺饵光纤激光器的功率特性。通过对光纤Ｂｒａｇｇ光栅的光谱特性和激光器的传播方程的分析,得到了阈值泵浦光功率、掺饵光纤长度、Ｂｒａｇｇ光栅反射率与激光器输出光功率之间的关系。与近期报道的实验数据进行了比较,结果十分吻合。     

单频DBR光纤激光器的设计

基于速率方程理论，给出ＤＢＲ光纤激光器单模运转的条件，并通过对光栅反射特性的分析及一些近似处理，进行了具体设计。对实际制作具有理论指导意义。     

尖锥端光纤和半导体激光器的耦合

介绍了一种低反射高效率的尖锥端光纤和半导体激光器的耦合技术。应用模式耦合理论分析表明，这种尖锥端光纤的耦合效率可接近９０％，锥端反射损耗大于６０ｄＢ。因此，这种耦合技术既可以提高ＬＤ和光纤的耦合效率，又可以大大降低耦合反射对ＤＦＢ等激光器的影响。简单介绍了这种尖锥端光纤的制造技术，通过精密的磨抛加工，即可获得理想的尖锥端。用自行加工制备的尖锥端光纤与ＤＦＢ半导体激光器耦合，实际测量的耦合效率最大达７３．９％，反射损耗优于５０ｄＢ。     

国外信息

国外信息产生高功率低噪声的第一台分布反馈光纤激光器英国南安普顿大学的科学家已经开发了被认为是第一台的分布反馈（ＤＦＢ）光纤激光器．这台器件由０．９８μｍ激光二极管泵，光纤长度很短，能在１．５３Ｐｍ产生２ｍＷ功率．这台ＤＦＢ光纤激光器具有单频、高功率、...     

运行在1053nm的单偏振相移DFB光纤激光器

我们通过对相移ＤＦＢ激光器的光栅部分施加一个应力 ,可以使相移光纤激光器工作在单偏振状态下 ,而且激光器的输出功率增加了一倍。实验所用的掺Ｙｂ3+光纤是武汉邮电科学研究院研制的。光纤参数如下 :光纤芯径为 6 10 μｍ ,截止波长为 90 7μｍ ,对 975ｎｍ的吸收为 68ｄＢ ｍ ,相移光纤光栅长度为 10ｃｍ ,是由中国科学院上海光机所信息科学研究室制作的 ,λ 4相移制作在光纤光栅的中间。实验所用抽运源为波长为 976ｎｍ的带尾纤的半导体激光器 ,抽运光经ＷＤＭ进入ＤＦＢ光纤激光器 ,其中掺Ｙｂ3+光纤长 50ｃｍ ,光纤光栅刻在整个光纤…     

区域网光调制传输技术论述

本文从半导体ＤＦＢ激光器的物理特性介绍开始，分析了光信号调制与传输中的Ｃｈｉｒｐ效应，激光器ＲＩＮ噪声，非线性失真特性以及光纤色散和１５５０ｍｍ段特有的非线性ＳＢＳ光学效应。之后，简述了掺珥光纤放大器的技术特点。     

“星火”系列750MHz激光器模块

“星火”系列７５０ＭＨｚ激光器模块瑞波电子技术有限公司Ｊｅｒｒｏｌｄ在１９９４年推出了ＡＭ─ＢＬＡＺＥＲ（“星火”系列）激光器模块，它采用１０：１数字视频压缩技术，能在单根光纤上传输５００个以上电视频道信号。每个ＤＦＢ（分配反馈）激光器模块有一个内部...     

采用直接调制DFB—LD及色散补偿光纤的306km非色散位移光纤上…

基于理论模型仿真后的系统优化，在３０６ｋｍ非色散位移光纤上进行了２．４Ｇｂｉｔ／ｓ无中继传输实验，无功率代价。实验采用一个多激活层的直接调制ＤＦＢ激光器和色散补偿光纤。     

DFB半导体激光器的频移和色散脉冲崎变

根据分布反馈（ＤＦＢ）半导体激光器的耦合波理论和电吸收调制器模型，推导出了描述ＤＦＢ／ＥＡ集成器件中调制器的端面反射造成的激光器的静态频移和动态频移的解析表达式，动态频移（“反射啁啾”）正比于调制器的有效端面反射率。利用动态频移模型对光脉冲经过反常色散光纤传输后的波形进行了计算机仿真，取得了与实验一致的结果。结果表明：无论脉冲的初始啁啾的正负如何，“反射啁啾”总是使得传输后的脉冲变窄，当反射啁啾为正时，脉冲的上升沿出现“过冲”，而下降沿变缓；当反射啁啾为负时，情况与之相反。     

光纤激光水听器阵列实验研究

构建了基于分布反馈式(DFB)光纤激光器的光纤激光水听器阵列,4元DFB光纤激光器通过同一个980nm激光器同线泵浦,阵列发出的1550nm左右的复合激光通过解波分复用(BWDM)分离至独立的通道,实验结果表明,4元光纤激光水听器探测的水声信号能被无失真的解调,阵列各通道间串扰小于-60dB。     

表面发射光子晶体DFB激光器

光子晶体（PC）具有周期性折射率变化，并具有实现新型光器件的极大潜力，正受到广泛关注。本文介绍了PC基本原理与特性，并介绍了表面发射（SE）光子晶体分布反馈（DFB）半导体激光器的结构、最佳化设计、制作工艺和输出特性。     

Coherent combining of two pulsed fibre lasers in phase modulated mutually coupled fibre laser array

A scalable architecture for coherent combining of pulsed fibre lasers is reported. Stable synchronous and phase-locked pulsed fibre laser beams are generated in a phase modulated mutually coupled fibre laser array. The mechanism for generating a pulsed laser is different from previous Q-switching, modelocking or pump modulation methods. Two pulsed fibre lasers are coherently combined with 0.48 J pulse energy at the repetition rate of 115 kHz. The repetition rate can be controlled by adjusting the pump current. The combining efficiency of the two pulsed fibre lasers reaches 90 and the fringe contrast is larger than 40 .     

InGaAs-GaAs脊波导DBR激光器双模运行特性研究

对一种新型InGaAs-GaAs脊波导分布式Bragg反射(DBR)半导体激光器双模运行特性进行了研究.该激光器由1个普通增益区和2个DBR区组成,两DBR区采用均匀蚀刻的Bragg光栅,中间加入50～100 μm的分隔区,以减小两DBR区间的热作用影响.实验发现,在增益区偏置电流强度满足双模(双波长)运行条件的情况下,在分隔区施加一电流Ispace,会对双模调谐特性产生非常大的影响.结果表明:施加适当的Ispace可使双波长的可调谐间隔显著增加,并同时提高2个激射模的边模抑制比;在一定的范围内,较大的Ispace对应较好的双模运行参数.测量了3种几何尺寸样品在多种偏置电流下的双模运行特性,对分隔区长度、Ispace以及两者组合对双模调谐特性的影响作了深入研究.研究结果对改善双波长DBR半导体激光器双模运行特性给出了有用的信息.     

Phase-locking of two photonic crystal fibre lasers by mutual injection scheme

In recent years, exciting progress has been made in the upscaling of high-power fibre lasers, owing to the advance in cladding pump and fibre fabrication technologies. Especially, with the advent of photonic crystal fibres (PCFs), Yb-doped PCFs are rapidly being developed and utilised in the study of high-power fibre lasers, the reported output power of PCF laser having exceeded kW levels [1]. Compared with the conventional fibres, PCFs have many unique properties such as endless singlemode guiding, large singlemode area, small nonlinearity, and high numerical aperture of inner cladding, etc., which make PCFs especially suitable for producing high-power lasers with good beam quality. However, as in the case of the conventional fibre lasers, nonlinear effects and onset of catastrophic thermo-optical damage are the main limitations of the upgrading of high-power PCF lasers. Thus, coherent addition schemes are also desired for PCF lasers to achieve higher output power with higher brightness.     

Power scaling of fibre lasers with all-fibre interferometric cavity

Two interferometric laser cavities are proposed for efficient combining of two fibre lasers. A 3 dB gain in power by coherent coupling of two identical erbium-doped fibre lasers is demonstrated. Scaling in power is envisaged through cascading of a coherent combination of elementary lasers     

光通信用垂直腔面发射激光器的进展

垂直腔面发射激光器(VCSEL)以其优异的性能有望成为信息时代的新光源.文章介绍了用于光通信的VCSEL的开发现状.     

Wavelength and intensity stabilisation of 980 nm diode laserscoupled to fibre Bragg gratings

The wavelength and intensity of 980 nm diode lasers are stabilised by coupling the lasers to low-reflectivity (<5%) fibre Bragg gratings. Power of up to 100 mW from the singlemode fibre has been obtained. The increased stability of these permanently mounted devices may result in improved performance of erbium-doped fibre amplifiers     

Five wavelength DFB fibre laser source for WDM systems

Singlemode UV-induced distributed feedback (DFB) fibre lasers with a linewidth of <15 kHz and a sidemode suppression better than 61 dB are presented. The stability of the lasers is verified by a 10 Gbit/s transmission experiment. Five DFB fibre lasers are cascaded and pumped by a single semiconductor laser, thereby forming a multiwavelength source for WDM systems     

Generation of 10 nJ picosecond pulses from a modelocked fibre laser

Wavelength-tunable very high power soliton fibre lasers are constructed using chirped fibre Bragg gratings. Near-bandwidth limited pulses with widths of 4.0 ps and pulse energies up to 10 nJ are generated directly from passively modelocked erbium fibre lasers. A stable pulse repetition rate of 17 MHz is obtained, giving rise to an average modelocked output power of 170 mW