共查询到19条相似文献,搜索用时 468 毫秒
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《中国光学与应用光学文摘》2005,(3)
TN253 2005031975 利用线性啁啾光纤光栅补偿PMD的实验研究=Experi- mental research on PMD compensation using linearly chirped fiber Bragg grating[刊,中]/张霞(北京邮电大学理 学院.北京(100876)),黄永清…∥半导体光电.-2004, 25(4).-293-295 对利用线性啁啾光纤光栅补偿偏振模色散(PMD)进 行了实验研究。利用压电陶瓷的压电效应挤压线性啁啾 光纤光栅使之产生双折射,用于补偿光通信系统中的偏振 模色散。通过改变施加在压电陶瓷上的电压值,可实现对 相似文献
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基于线性啁啾光纤布拉格光栅的色散补偿原理,探讨了不同的准高斯型耦合系数函数曲线对色散补偿特性的影响,建立使该光栅色散补偿曲线既具有高色散系数和宽带特点,同时对边峰还有相对的抑制能力的设计思想。文中讨论了相关参数对色散补偿曲线的影响。 相似文献
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利用啁啾光纤光栅的温度可调谐效应,提出了一种新型的色散补偿方法.该方法使啁啾光纤光栅处于一个连续的线性温度梯度场中,通过调节啁啾光纤光栅两端的温度差,改变其色散量,实现在以啁啾光纤光栅为展宽器和以体光栅为压缩器的超快激光系统中对输出脉宽的连续精密调节,并通过实验验证这一方法的可行性.实验结果表明:沿着啁啾光纤光栅应用连续的温度梯度场,当温差从0℃到50℃变化时,可以连续地调节啁啾光纤光栅的色散参数.展宽器和压缩器之间的色散失配可以通过调节线性温度场的温度梯度得到补偿,避免了繁琐的脉宽优化步骤.本文是以啁啾体光栅为压缩器的光纤啁啾脉冲放大系统中通过调节施加在展宽器上的连续线性温度场的梯度,实现对啁啾脉冲系统中的色散失配进行精密调制的技术方案. 相似文献
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光纤光栅非线性时延对啁啾的电视信号的影响 总被引:1,自引:1,他引:0
分析了有线电视系统中,用作色散补偿的光纤光栅因色散抖动对信号载波互调比产生的影响,结果显示色散抖动对有线电视信号互调比的影响随拦动幅度、抖动周期、信道数目的加而增加,信道频率的分布也对其的影响。对光栅的色散特性进行数值估算,发现常耦合系数线性啁啾光栅不能用的有线电视系统中进行色散补偿。 相似文献
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Chirped Bragg光纤光栅的优化设计与优化指数 总被引:1,自引:0,他引:1
根据线性ChirpedBragg光纤光栅的一般原理 ,探讨了不同啁啾系数 ,准高斯耦合函数对Bragg反射光栅的反射率及色散补偿特性的响应。结果表明 :增大啁啾系数以及选取适当的准高斯耦合函数 ,在保证反射率较大的情况下 ,能有效地改善色散补偿特性。通过引入微波领域的“优化指数”这一概念 ,量化了色散补偿器的补偿能力。 相似文献
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利用遗传算法优化线性啁啾光栅性能 总被引:3,自引:2,他引:1
针对制作町用于40 Gb/s全光色散补偿的宽带线性啁啾光栅时出现带内群时延纹波波动较大等问题.提出了一种通过设计和改变切趾函数的参量来优化线性啁啾光栅的新方法.该方法实现简单.只需根据需要设计具有不同滚降特性的切趾函数,同时利用遗传箅法来优化切趾参量.结合传输矩阵法经过200代获得了低带内时延纹波的线性啁啾光栅.数值结果验证了采取非对称分段切趾法在保持反射谱宽和平坦性的同时可以抑制带内群时延纹波的优越性.利用该方法制作了反射谱工作带宽为1.06 nm、时延纹波不超过45.60 ps、可用于大容量密集波分复用系统(DWDM)色散补偿的线性啁啾光纤光栅. 相似文献
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利用啁啾光纤光栅进行色散补偿的研究 总被引:1,自引:0,他引:1
分析了由于光纤的色散引起的脉冲展宽,并介绍了啁啾布拉格光纤光栅进行色散补偿的基本原理。2-5Gb/s、100km 色散补偿的实验结果表明,利用啁啾光纤光栅进行色散补偿是一种切实可行的色散补偿方案。 相似文献
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To model chirped fiber Bragg gratings (FBGs) for dispersion compensation in optical fibers a novel method of single expression
(MSE) is used. The reformulation of Helmholtz’s equation in the MSE to the full set of first-order differential equations
leads to dealing with the electric field amplitude, its derivative, power flow density and phase distributions in any aperiodic
media. The phase derivative obtained numerically permits to compute the dispersion slope in the time delay of investigated
chirped gratings. Reflective and time delay spectra of linearly chirped gratings of different lengths and chirp coefficients
are computed. A self-similarity law for the gratings of the same strength but different lengths and chirp coefficients is
revealed. The apodization of gratings is applied to reduce sidelobes in gratings’ reflection spectra and eliminate oscillations
in the time delay characteristics. 相似文献
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To model chirped fiber Bragg gratings (FBGs) for dispersion compensation in optical fibers a novel method of single expression (MSE) is used. The reformulation of Helmholtz's equation in the MSE to the full set of first-order differential equations leads to dealing with the electric field amplitude, its derivative, power flow density and phase distributions in any aperiodic media. The phase derivative obtained numerically permits to compute the dispersion slope in the time delay of investigated chirped gratings. Reflective and time delay spectra of linearly chirped gratings of different lengths and chirp coefficients are computed. A self-similarity law for the gratings of the same strength but different lengths and chirp coefficients is revealed. The apodization of gratings is applied to reduce sidelobes in gratings' reflection spectra and eliminate oscillations in the time delay characteristics. 相似文献
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N.M. Litchinitser M. Sumetsky P.S. Westbrook 《Journal of Optical and Fiber Communications Reports》2007,4(1):41-85
Tunable dispersion has been implemented in various technology platforms, including fiber gratings, planar waveguides, thin
film etalons, and bulk optic technologies. This paper will focus on fiber grating based tunable dispersion compensation, because
fiber gratings are at present one of the best developed TDC technologies available. The paper is divided into three parts.
In the first part we describe grating based TDC technologies and discuss their advantages and disadvantages. We focus on thermally
tuned linearly chirped fiber gratings, as these have to date been the most successful grating technology for 40 Gbit/s. We
also compare grating TDCs to two other prominent tunable dispersion technologies: thin film etalons and planar waveguide ring
resonators. In the second section we describe the techniques used to fabricate high performance dispersion compensation gratings
as well as the theory of the primary defect of fiber grating dispersion compensation: group delay ripple (GDR). In the third
section we describe the telecom system related issues for tunable gratings, including characterization of grating performance,
tunability requirements and results from actual system trials using tunable FBGs. 相似文献
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Zhongwei Tan Yanhua Wang Wenhua Ren Yan Liu Bin Li Tigang Ning Shuisheng Jian 《Optik》2009,120(1):9-13
The limitation of the system with dispersion compensation by chirped fiber Bragg gratings is investigated in this paper. The transmission distance of the system based on chirped fiber Bragg gratings surpasses 3000 km. The bit error rate (BER) of the system is below 10−9 for as long as 2000 km. The BER is about 10−7 at 3000 km and, when forward error correction (FEC) is added, zero BER can be achieved. It is the longest transmission system with dispersion compensation by chirped fiber Bragg gratings. 相似文献
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Asymmetrically apodized linearly chirped fiber Bragg gratings (FBGs) are shown to have highly linearized time-delay response. In simulations of a five-stage, 5-cm grating-based dispersion compensation system, asymmetrically apodized FBGs are shown to give over 60% reduction in the energy scattered from the main pulse body, 16 ps?60 ps pulses propagated over 800 km, as compared to a symmetrically apodized grating of similar length, strength, and bandwidth. 相似文献