光栅使光通信用可调谐光纤激光器成为可能

今天的光纤通信系统利用不同固定频率的半导体激光器可将每个通道的信号传送到一根光纤中。如果这些分立的激光器是可调谐的，即能从一个波长通道转换到另一个波长通道，这将会给网络增加极大的灵活性。如果一个单一的激光器就能同时产生所有通道的信号，那不仅会增加网络的灵活性，而且还会使网络设计简化。     

MEMS波长可调谐激光器及其进展

论述了MEMS波长可调谐激光器及其进展。介绍了几种不同类型的波长可调谐激光器,如基于表面微机械反射镜的MEMS可调谐激光器、基于深腐蚀圆形反射镜的MEMS可调谐激光器、基于闪耀光栅的MEMS可调谐激光器、基于阵列集成的MEMS可调谐DFB激光器和VCSEL基MEMS可调谐激光器。     

可调谐环形单模光纤激光器

本文介绍掺饵光纤形成的环形单模光纤激光器。当使用１．４８μｍ半导体激光器作泵浦源时，可调谐谱宽可达３０ｎｍ（从１．５３μｍ到１．５６μｍ），最大输出功率＞１ｍｗ，带宽＜２ｎｍ。     

光网络中的可调谐激光器的研究

随着光网络的不断发展，可调谐激光器显现出越来越重要的作用。本文主要介绍了各种不同类型的可调谐激光器，主要包括可调谐半导体激光器和可调谐光纤激光器，并对可调谐激光器的发展做了简单的介绍。     

可调谐光纤激光器及其进展

可调谐光纤激光器具有优越的性能。是目前国际上研究的热点技术。已广泛用于光通信、大气监测、光纤传感、测量等许多领域。并将成为可调谐半导体激光器的有力竞争对手。介绍了国内外可调谐光纤激光器的进展及其应用和市场前景。     

光纤激光器波长调谐技术研究

介绍了可调谐掺铒光纤激光器的工作原理和几种可调谐滤波器的工作特性及其调谐技术方法,重点介绍了光纤光栅作为滤波器的特性及其反射波长调谐技术.概述了掺铒光纤激光器输出波长调谐技术的现状,分析了有待解决的技术问题.     

基于F-P干涉技术的通信波段可调谐激光器

根据F-P干涉原理设计制作了楔型F-P滤波器,使用这种滤波器进行可调谐掺铒光纤激光器实验,980nmLD泵浦功率为25mW时获得了稳定的单纵模激光输出,输出功率约0．6mW,线宽低于0．06nm,在34．2nm波长调谐范围内功率变化不超过0．5dB,边模抑制比大于35dB。     

掺铥光纤激光器波长可调谐输出特性

利用1 550 nm光纤激光器搭建了一个同带泵浦环形腔掺铥光纤激光器,并对其光谱输出特性进行了研究。在1 550 nm激光泵浦下,1.6 m掺铥光纤自发辐射谱覆盖1 800~1 900 nm范围,3 dB带宽大于60 nm;通过在腔内插入隔离器,获得了线宽小于0.2 nm的激光输出,中心波长在1900 nm附近;进一步在腔内加入FP腔,获得了可调谐的窄线宽输出,光谱调谐范围达60 nm,覆盖从1 840~1 900 nm的光谱范围,激光线宽仅为0.07 nm。另外,在腔内使用通信波段用FP腔,同样获得了较宽调谐范围的窄线宽输出。输出光谱分为1 820~1 850 nm和1 865~1 915 nm两个区域,调谐范围共达80 nm。结合使用2 000 nm FP腔的可调谐光谱范围,该激光器在1 820~1 915 nm的范围都可以获得激光输出,与掺铥光线的自发辐射谱基本相符。     

Vertical cavity lasers for telecom applications

The authors review the development of long-wavelength vertical cavity lasers (VCLs) for telecommunications applications. Long-wavelength VCLs provide an attractive choice for inexpensive fiber optic communication. The different designs of such lasers are presented, along with the advantages and disadvantages of each. System requirements and experiments are also presented at 2.5 Gb/s over 200 km of optical fiber     

Single-frequency tunable semiconductor lasers

Work on single-frequency tunable-wavelength semiconductor lasers with an external cavity based on fiber Bragg gratings formed in a single-mode optical fiber is reported. Methods for discrete and continuous tuning of the emission wavelength are considered. The described lasers emit dynamically stable radiation with a narrow linewidth (10 kHz) in the wavelength range of 635–1650 nm.     

Mid-infrared tunable quantum cascade lasers for gas-sensingapplications

The quantum cascade (QC) laser does not involve the material bandgap for the generation of light. Therefore, InP- and GaAs-based III-V semiconductor materials can now be used for the generation of long-wavelength, mid-infrared light. These materials are also straightforward to process and pattern. This is essential for the more sophisticated device geometries such as distributed feedback (DFB) lasers. DFB lasers provide a very elegant and reliable method to achieve a well-defined single-wavelength emission (called single-mode operation) as opposed to the usually multiple-mode emission of free-running Fabry-Perot resonators. QC-DFB lasers were first demonstrated in 1996. They have evolved very rapidly and have already shown great promise in many different gas-sensing applications     

Photonic MEMS tunable laser sources

This article covers laser configurations, design and experiments of photonic microelectromechanical systems (MEMS) tunable laser sources. Three different types of MEMS tunable lasers such as MEMS coupled-cavity lasers, injection-locked laser systems and dual-wavelength tunable lasers are demonstrated as examples of natural synergy of MEMS with photonics. The expansion and penetration of the MEMS technology to silicon optoelectronic creates on-chip optical systems at an unprecedented scale of integration. While producing better integration with robustness and compactness, MEMS improves the functionalities and specifications of laser chips. Additionally, MEMS tunable lasers are featured with small size, high tuning speed, wide tuning range and CMOS compatible integration, which broaden their applications to many fields.     

A probabilistic design optimization for MEMS tunable capacitors

This paper presents a design optimization method for MEMS parallel-plate capacitors under fabrication uncertainties. The objective of the optimization problem is to maximize the production yield considering the fabrication tolerances. The method utilizes aspects of the advanced first-order second-moment (AFOSM) reliability method in probabilistic design to find a linearized feasible region for performance functions and uses an analytical double-bounded-probability distribution function (DB-PDF) to approximate the distribution of random variables. Then, it attempts to place the tolerance box in such a way that the portions of the box with higher yield lies in the feasible region. The yield is directly estimated using the joint cumulative distribution function (CDF) over the tolerance box requiring no numerical integration and saving considerable computational complexity for multidimensional problems. For this reason, any arbitrary distribution can be considered for random parameters and the problem is not restricted to normality assumptions. Numerical examples, verified by Monte-Carlo simulations, demonstrate that optimal designs significantly increase the yield. The advantage of the proposed design optimization method is that the yield can be maximized in early design stages without tightening tolerances or increasing the fabrication cost and complexity. The application of the presented method is not limited to tunable capacitors and can be extended to other MEMS devices.     

可调谐电子振动的固体激光器

离子晶体中掺入过镀金属离子的电子振动激光器，是一类新型的可调谐高功率红外固体激光器，其激光波段可望复盖0．5μm-5μm的光谱区。本文综述了这类激光器的发展近况，分析讨论了这类激光器及激光晶体材料的光电特性，并对今后发展的可能趋向作一评述。     

可调谐激光器波长控制

文章介绍了可调谐激光器的波长调节及稳定控制的设计方法,并通过试验验证了其可行性.该设计由温度控制、偏置电流控制及锁波电路3部分组成,温度控制粗调波长,偏置电流控制微调波长,而锁波电路主要是针对外界温度发生变化时提供反馈.它适用于温度控制型分布反馈式 (DFB)可调谐激光器的外围电路设计.     

可调谐激光器的宽带高反射镜

选择了适当的制备工艺,并改善膜系以减弱膜内的电场强度,获得低损耗可见光区的宽带高反射镜。     

国内外通信用可调谐激光器研究进展

通信用可调谐激光器是密集波分复用系统及未来的全光网络的关键器件,将给网络带来前所未有的灵活性和动态性能。全面、详细地阐述了各种可调谐激光器的结构、特点以及调谐机制,概括了国内外通信用可调谐激光器的研究进展和发展趋势。     

Optical channel switching algorithm for continuously tunable lasers

A novel idea and realisation of a control algorithm to switch the wavelength of continuously tunable lasers is presented. The concept allows the switching of a defined number of dense wavelength division multiplexed (DWDM) channels up or down by employing a broadband wavelength locker. The switching algorithm is implemented and demonstrated for a micro-electro-mechanically tunable vertical-cavity surface emitting laser (MEM-VCSEL).