光纤光栅外腔半导体激光器频率调谐技术研究

在分析了光纤光栅外腔半导体激光器(FBG-ECL)基本特性的基础上,调研了适用于该类型激光器的频率调谐方法,包括温度调谐法和应力调谐法,选取轴向应力调谐法改变光纤光栅的布拉格中心波长,进而实现频率调谐。利用压电陶瓷(PZT)来对光纤光栅施加轴向应力,通过调整PZT驱动电压值的大小来控制光纤光栅布拉格中心波长的变化量。实验结果表明,对于波长1550 nm的光纤光栅激光器,当PZT的驱动电压增加到126 V时,可实现 0.8 nm,即100 GHz的调谐范围以及每周期2 ms的调谐速度。     

全光纤转动拉曼激光雷达的光纤光栅分光技术研究?

设计了一款由可见光波段的光纤布喇格光栅和光纤耦合器构建的全光纤转动拉曼激光雷达分光系统。利用相位掩模板侧向成功刻写530 nm波段光纤布喇格光栅,并初步测试其透射谱和反射谱性能。为提高光纤光栅中心波长与大气氮气分子转动拉曼谱线的匹配特性,利用悬臂梁设计高调谐灵敏度的调谐系统。实验结果表明,成功研制的可见光波段光纤布喇格光栅其反射率约为95%,带宽约为0.3 nm,应力调谐系统可实现± 0.6 nm范围18 pm/r 的波长调谐。     

114-nm wavelength tuning range of a vertical grating assistedcodirectional coupler laser with a super structure grating distributedBragg reflector

A vertical grating assisted codirectional coupler laser with a super structure grating distributed Bragg reflector is demonstrated. A record stepwise tuning range of 114 nm was measured with good side-mode suppression. The tuning behavior of the device is investigated showing a potential of a tuning range exceeding 100 nm with complete wavelength coverage     

光纤布喇格光栅电流传感器研究

本文实现了一种基于磁致伸缩棒在均匀磁场中的伸缩效应的光纤布喇格光栅电流传感器 .把光纤布喇格光栅牢固地沿纵向粘贴在一个置于多层漆包线绕成的螺线管中间的磁棒上 ,磁棒在螺线管中间部分的匀强磁场中随漆包线中电流的增加而沿纵向伸长 ,从而带动光栅在应变的作用下改变波长 .实验测得电流跟波长变化基本上成线性关系 ,波长的改变范围约 0 .9nm,其灵敏度约为 0 .0 0 1nm/ m A     

基于轴向压缩技术的宽调谐光纤光栅滤波器的研制

研制了一种宽调谐光纤光栅滤波器。该滤波器通过光纤插芯导引光栅,利用轴向压缩技术,实现了25nm的调谐。调谐过程中,FBG布拉格波长改变量与微位移台调节量呈良好的线性关系,FBG反射率波动小于0.59dB,3dB带宽波动小于0.1nm,装置稳定性较好,布拉格波长在30分钟内的漂移量小于0.07 nm。     

光纤光栅的电磁调谐

提出了一种光纤光栅电磁调谐的新方法.实验表明,此种调谐方法在0～85.5 mA电流范围内,光纤光栅波长移动达1.16 nm.该调谐系统具有结构简单、灵敏度高等优点.     

应力作用下光纤光栅Bragg波长调谐特性的研究

本文对１５５０ｎｍ光纤光栅在纵向拉伸应力和侧向拉伸应力作用下Ｂｒａｇｇ波长的偏移特性进行了实验研究。当纵向拉伸应力加至３．６０Ｎ（３６７．６０ｇ）时,得到了５．０２ｎｍ的调谐范围。这可能是在相同应力作用下,目前所报道的最好结果。此外,还对光纤光栅弯曲所导致的其Ｂｒａｇｇ波长的迁移特性进行了实验研究,并比较了对光纤光栅段添加涂覆层前后的调谐情况,得到了最大为３．０２ｎｍ的皮长调谐范围。     

Bragg grating fast tunable filter for wavelength divisionmultiplexing

A Bragg grating fast tunable filter prototype working over a linear tuning range of 45 nm with a maximum tuning speed of 21 nm/ms has been realized. The tunable filter system is based on two piezoelectric stack actuators moving a mechanical device thus compressing an apodized fiber Bragg grating. The filter allows both traction and compression and can work in transmission and in reflection. It is designed to work with a channel spacing of 100 GHz according to the ITU specifications for wavelength division multiplexing systems     

Access to 20 evenly distributed wavelengths over 100 nm using onlya single current tuning in a four-electrode monolithic semiconductorlaser

We report improved tuning regularity in a vertical grating assisted codirectional coupler laser with a super-structure grating distributed Bragg reflector (GCSR). Access to 20 wavelengths with SMSR better than 20 dB within a tuning range of 100 nn was obtained with a single current control in a GCSR laser. The total tuning behavior shows a potential of complete wavelength coverage over 100 nm by use of three tuning currents     

单片集成倾斜SOA的宽可调谐取样光栅分布布拉格反射激光器

高功率和宽调谐范围的单片集成倾斜SOA的宽可调谐取样光栅分布布拉格反射激光器被成功制备。倾斜的SOA结构和端面增透膜有效的降低了端面的反射率。器件调谐范围大于38nm,波长覆盖较好,调谐范围内波长输出功率均大于9mW。     

Monolithic integration of widely tunable sampled grating DBR laser with tilted semiconductor optical amplifier

High output powers and wide range tuning have been achieved in a sampled grating distributed Bragg reflector laser with an integrated semiconductor optical amplifier. Tilted amplifier and anti-reflection facet coating are used to suppress reflection. We have demonstrated sampled grating DBR laser with a tuning range over 38 nm, good wavelength coverage and peak output powers of more than 9 mW for all wavelengths.     

Broad-range wavelength tuning in DBR lasers with super structuregrating (SSG)

Broad-range wavelength tuning is demonstrated in tunable distributed Bragg reflector (DBR) lasers with the super structure grating (SSG) proposed. The SSG is fabricated by electron beam exposure lithography. The grating performance is measured by transmittance characteristics of the SSG reflector. A maximum tuning range of 63 nm is obtained under the CW condition while keeping a single longitudinal mode. In a 50-nm tuning range, the threshold current variation is as low as 5.0-9.5 mA     

SGDBR激光器中取样光栅的理论和实验研究

讨论了取样光栅分布布拉格反射激光器(SGDBR)中取样光栅对激光器调谐范围、输出功率和光谱质量的影响,介绍了其设计流程,并据此对SGDBR进行了实验研究.其取样光栅的反射谱和设计相符,且在30nm准连续调谐范围内边模抑制比都大于30dB.     

40-nm-wide tunable fiber ring laser with single-mode operationusing a highly stretchable FBG

We demonstrate a 750-Hz linewidth single-mode erbium-doped fiber (EDF) ring laser with wide tunability using a widely tunable fiber Bragg grating (FBG). The stable single-mode operation is realized by using the FBG as a narrow wavelength-selective element and 4 m of unpumped EDF as a saturable absorber in the cavity. The 40-nm continuous tuning range of 1522-1562 nm is achieved using a highly stretchable FBG that exhibits a filter tuning range of over 52 nm. The grating is prepared with chemically stripped deuterium-loaded fiber to eliminate degrading factors for the grating strength, thereby achieving the wide tunability. The tuning range represents a 3.5-fold increase in wavelength tuning over previous use of FBGs     

一种新颖的宽带可调光纤光栅滤波器

分析了光纤光栅（FBG）调谐的基本原理,进而采用新颖的调谐结构,设计并实现了一种宽带可调谐的FBG滤波器。该滤波器仅用1支FBG制做而成,其波长调谐范围最高可达40nm。实验结果表明,该FBG滤波器的调谐波长与调谐步进位移量之间具有良好的二次曲线关系。     

Multiple-phase shift super structure grating DBR lasers for broadwavelength tuning

Broad range wavelength tuning in distributed Bragg reflector (DBR) lasers using a super structure grating with multiple phase shifts is discussed. Experimental results indicate that the laser achieves a maximum tuning range of 105 nm with stable single-mode continuous wave (CW) operation     

Integration of a multimode interference coupler with a corrugated sidewall Bragg grating in planar polymer waveguides

We demonstrate the integration of a 3-dB multimode interference coupler with a corrugated sidewall Bragg grating in planar polymer waveguides by direct electron beam writing. Both transmission and reflection spectra of the Bragg grating are measured through this integrated device directly. We use the thermooptic effect to tune the integrated waveguide grating, achieving a tuning range of 6.2 nm and a bandwidth variation of 0.3 nm within a temperature change of 62/spl deg/C.     

Characteristics of super structure grating (SSG) DBR lasers underbroad range wavelength tuning

Spectral characteristics of the super structure grating (SSG) distributed Bragg reflector (DBR) lasers under broad range wavelength tuning are discussed. SSG DBR lasers show good spectral characteristics with broad range wavelength tunability. Under the directly intensity modulated condition, stable single longitudinal mode oscillations are also obtained over the broad wavelength tuning range     

Single-mode operation characteristics of a self-injection seededFabry-Perot laser diode with distributed feedback from a fiber grating

We study the operational characteristics of a self-injection seeded laser diode in an external cavity consisting of a fiber Bragg grating. The distributed feedback (DFB) of light in the grating provides an additional tolerance of frequency detuning in mode selection. The spectral characteristics at different operating frequencies and feedback rates have been investigated. Wavelength tuning has also been realized by applying compressive and tensile strain to the grating and a tuning range of 11.6 nm has been obtained     

双体光栅外腔二极管激光器光谱特性研究

为了研究双体布喇格光栅外腔二极管激光器的衍射特性,采用一块体布喇格光栅与一块横向啁啾体布喇格光栅组成双体布喇格光栅,理论分析了组合前后体布喇格光栅的衍射特性,实验研究了双体布喇格光栅外腔二极管激光器的输出光谱特性。结果表明,在双体布喇格光栅外腔反馈的作用下,可以实现双波长同时输出,通过横向移动横向啁啾体布喇格光栅,可以在保持其中一个中心波长不变的情况下,使另外的一个波长在800nm~815nm的范围内线性调谐。此研究为基于双体布喇格光栅实现双波长输出的大功率二极管激光器提供了实验指导。