共查询到20条相似文献,搜索用时 109 毫秒
1.
提出利用镍钛合金压杆弯曲应变引入到光纤布拉格光栅(fiber Bragg grating,FBG)实现无中心波长漂移可调谐线性啁啾化方法并进行了实验验证。设计一种镍钛合金压杆结构,理论计算并有限元分析验证了应变分布情况。将光纤光栅粘贴在镍钛合金压杆上,弯曲压杆将线性拉伸与压缩应变引入到栅区,利用光谱仪记录反射谱。实验结果表明,当压杆移动距离达到12.5 mm时,反射谱带宽增大到1.57 nm,中心波长漂移量仅为0.11 nm。利用光纤光栅啁啾化理论,结合传输矩阵法和龙格库塔法实现啁啾光纤光栅光谱重构。实验结果与仿真结果吻合。该方法制作的啁啾光栅可以实现带宽可调谐且基本无中心波长漂移,在光纤传输和传感领域均具有一定的应用前景。 相似文献
2.
3.
基于悬臂梁啁啾调谐的光纤光栅滤波器 总被引:1,自引:1,他引:0
提出并发展了一种基于悬臂梁结构的啁啾光纤Bragg光栅(CFBG)啁啾调谐方案,获得了一系列性能优异的可调谐CFBG滤波器,包括调谐范围达到36 nm(1.8~37.8 nm)的带宽可变反射滤波器、色散在178~2 100ps/nm范围内可调的色散补偿器、基于取样CFBG或重叠写入CFBG的信道间隔可调谐滤波器等。这些FBG滤波器不但能维持较高的反射率,还能保持中心波长基本不变。 相似文献
4.
5.
6.
7.
设计了一种新颖的60km色散补偿8信道50GHz信道间隔的啁啾光纤Bragg光栅(CFBG)梳状滤波器。采用基于LP算法的IS光纤光栅设计技术,设计出CFBG的折射率调制函数和啁啾分布。根据设计得出的耦合系数分布,采用传输矩阵法分析所设计CFBG的反射谱、时延曲线和群时延抖动。结果表明,所设计的CFBG不仅满足了设计指标要求,性能优良,而且在已知的制作技术条件下可以实现。 相似文献
8.
啁啾光纤光栅EDFA增益平坦滤波器的设计与制作 总被引:3,自引:1,他引:2
采用啁啾相位掩膜板和程控扫描曝光技术,在经过载氢增敏处理的普通单模光纤上制作出可以用于掺铒光纤放大器(EDFA)增益谱平坦化的啁啾光纤布喇格光栅(CFBG)型增益平坦滤波器(GFF),运用数值解析的方法得到曝光量曲线,并将之分解成曝光频率、曝光功率密度、光斑尺寸和光纤移动速度的曝光函数,按照曝光函数进行程控扫描曝光从而精确控制光栅的反射率.对制作的CFBG进行退火老化处理和温度补偿及保护封装,封装后GFF的温漂系数在-20~ 70 ℃内变化小于1 pm/℃,经平坦后的EDFA增益谱在30 nm带宽范围内,不平坦度<±0.3 dB.根据不同的EDFA的ASE谱,可程控给出不同的曝光函数,以制作具有不同反射谱的CFBG型GFF. 相似文献
9.
10.
11.
Shenping Li Chiang K.S. Gambling W.A. Liu Y. Zhang L. Bennion I. 《Photonics Technology Letters, IEEE》2000,12(11):1441-1443
We report an effective technique for generating wavelength-tunable chirp-compensated single-mode pulses with a high sidemode suppression ratio (SMSR) based on self-seeding a Fabry-Perot laser diode. This technique relies on the use of a tunable linearly-chirped fiber Bragg grating to provide wavelength-selective feedback, output filtering, and chirp compensation. With this technique, we have generated chirp-compensated picosecond pulses with a SMSR higher than 40 dB over a tuning range of 11.5 nm. 相似文献
12.
J. Mora B. Ortega M.V. Andres J. Capmany J.L. Cruz D. Pastor S. Sales 《Photonics Technology Letters, IEEE》2003,15(7):951-953
We present a new variable dispersion device based on tuning the chirp of a tapered fiber Bragg grating by means of a magnetic transducer. By using a nonuniform magnetic field, we demonstrate a 188-472-ps/nm dispersion tuning range, suitable for tunable radio-frequency filters and dispersion compensation, among others. 相似文献
13.
An efficient scheme to change the chirp rate of a fiber Bragg grating (FBG) has been developed based on a specially-designed cantilever beam with the beam-bending method. It allows, to date, the largest tuning range of 36 nm in reflection bandwidth of a chirped-FBG (CFBG) while keeping the center wavelength nearly fixed during the tuning process. Using this method, bandwidth-tunable fiber grating filters with tunable chromatic dispersion or differential group delay have been demonstrated. Channel spacing-tunable multi-wavelength filters based on both sampled- and superimposed-CFBGs have also been realized. Moreover, tuning of the bandwidth and channel spacing is continuous with this scheme that makes the achieved devices more flexible. 相似文献
14.
Tuan Guo Bo Liu Hao Zhang Qida Zhao Xiaoyi Dong 《Photonics Technology Letters, IEEE》2007,19(14):1096-1098
A novel technique for continuous chirp control of a fiber Bragg grating (FBG) based on a double-hole cantilever beam (DHCB) is proposed and experimentally demonstrated. The specifically designed DHCB provides a pressure-position-dependent strain-gradient along an originally uniform FBG and allows a tunable linear and Gaussian chirp modulation over the grating spectrum. Bandwidth and wavelength-independent tuning, under center-applied-pressure effect, is achieved by linear chirp modulation with a symmetrical broadening profile and a temperature-controlled wavelength shift. And intensity-referenced temperature-immune pressure measurement, under side-applied-pressure effect, is accomplished by Gaussian chirp modulation with a single-side-broadening profile and a linear-increasing reflection optical power. 相似文献
15.
Dynamic responses of widely tunable sampled grating DBR lasers 总被引:1,自引:0,他引:1
San-Liang Lee D.A. Tauber V. Jayaraman M.E. Heimbuch L.A. Coldren J.E. Bowers 《Photonics Technology Letters, IEEE》1996,8(12):1597-1599
The modulation bandwidth, dynamic mode suppression ratio, and wavelength chirp of directly modulated sampled grating DBR lasers have been measured. Although the tuning range can be up to an order of magnitude larger than in simple DBR lasers, the chirp is about the same or better over a wide range of operation parameters. The modulation bandwidth was in excess of 4 GHz and the dynamic MSR remained larger than 40 dB as long as the current did not swing below threshold. The linewidth enhancement factor was extracted from the measured chirp parameters and ranged from three to eight for different lasing wavelengths of the tunable lasers. The dispersion of the linewidth enhancement factor is consistent with published theoretical predictions. 相似文献
16.
研究光寻址电位传感器(LAPS)的器件噪声特性 。通过对LAPS半导体场效应器件的结构分析,建 立LAPS的理论模型,并进一步分析LAPS器件噪声信号的来源、种类及特性。以 pH缓冲液中H离子 浓度为检测对象,搭建基于NI采集卡和Labview环境的LAPS测试系统,对影响LAPS信号噪声 特性的光源 波长、光源调制频率、光源强度和Si衬底厚度等因素进行了仿真和实验研究。结果表明,增 大光源波长和光源强度 是提高输出信号幅值和信噪比(SNR)的最有效方法。 相似文献
17.
Zhanxione Wei Yongsen Yu Hua Xing Zhongchuang Zhuo Yuanda Wu Liang Zhang Wei Zheng Yushu Zhang 《Photonics Technology Letters, IEEE》2001,13(8):821-823
We theoretically analyze and experimentally demonstrate a simple method for adjusting the chirp of chirped fiber gratings by temperature, while the central wavelength is temperature insensitive. Chirped fiber grating with tapered cross-section area is mounted under tension in a negative thermal-expansion coefficients material. The central wavelength is determined by the tension, and almost does not vary with temperature after packaging. The chirp can be adjusted by temperature. The grating in the package exhibits a linear variation in chirp of -0.00051 nm/cm/°C, and the temperature coefficient of central wavelength is -0.0018 nm/°C 相似文献
18.
The tuning characteristics of ridge waveguide DBR lasers have been measured under CW and pulsed grating currents. Under CW grating current injection, a maximum tuning range of 2.5 nm was measured. This tuning range was extended to almost 7 nm under pulsed conditions. The increase in the tuning range is explained by the absence of thermal tuning mechanisms for pulsed grating currents and the dominance of thermal tuning in the ridge waveguide structure at large CW grating currents is explicitly shown.<> 相似文献
19.
G. Ghislotti S. Balsamo P. Bravetti 《Photonics Technology Letters, IEEE》2003,15(11):1534-1536
We present a 10-Gb/s LiNbO/sub 3/ Mach-Zehnder modulator that allows tuning of the chirp in a wide range (-0.7/spl divide/0.7) by applying just a dc voltage, while the radio-frequency section is single drive. The device shows uniform performances across the chirp tuning range. By tuning chirp value, transmission tests showed power penalty less than 2 dB for spans up to 2100 ps/nm. 相似文献