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对存在偏振模色散(PMD)和群时延(GD)抖动的非理想线性啁啾光纤光栅的色散补偿特性进行了研究。实验测量了啁啾光纤光栅的群时延谱和偏振模色散光谱,理论分析和实验测量表明,啁啾光纤光栅差分群时延(DGD)抖动与其时延抖动密切相关。通过数值模拟方法,计算了线性啁啾光纤光栅偏振模色散眼图代价与入射到啁啾光纤光栅色散补偿器的光信号的偏振方向的关系,计算结果表明在使用啁啾光纤光栅色散补偿器时应对光信号的偏振方向进行调整,以获得最佳补偿效果。另外结合实验数据,模拟计算并讨论了非理想线性啁啾光纤光栅群时延抖动和偏振模色散引起的信号的展宽和脉冲形状的劣化。 相似文献
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本文提出一种基于线性啁啾光纤光栅补偿偏振模色散的新方案,对光纤光栅由于挤压而产生的群时延差进行了理论计算,并实验测量了一被挤压的线性啁啾光纤光栅的两偏振方向的群时延曲线,测量的结果证明这种方案切实可行。 相似文献
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研究了近年来光纤光栅作为偏振模色散补偿器件的成果,对基于线性和非线性啁啾光纤光栅的PMD补偿方案和补偿效果作了较全面的总结、分析和比较. 相似文献
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对啁啾光纤光栅的偏振模色散模型进行了研究,并实验观察了均匀光纤光栅由于弯曲而引起反射波长的移动,由此对弯曲的啁啾光纤光栅产生的偏振模色散进行了估算,结果表明,啁啾光纤光栅由于弯曲而产生的偏振模色散群时延差可以忽略不计。 相似文献
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啁啾光纤光栅是用于偏振模色散补偿的重要光无源器件。本文对基于两个啁啾光纤光栅的偏振模色散补偿系统进行了分析。重点分析了啁啾光纤光栅的一阶啁啾系数c1和两个光栅之间的有效折射率差△n变化对系统补偿特性的影响,并进行了数值仿真。 相似文献
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首先介绍了不同种双折射率差Δn的光纤制成的啁啾光纤光栅中偏振模色散现象 ,然后说明了光栅中偏振模色散的大小与 Δ n的相关性 ,并阐述了对用于色散补偿作用的啁啾光纤光栅中偏振模色散的消除 (补偿 )方法 ,最后指出利用啁啾光纤光栅中大的偏振模色散对高速光通信系统传输线路中偏振模色散的补偿方法。 相似文献
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根据量子力学理论导出光纤色散理论模型,并从光的波动理论出发,给出线性啁啾光纤光栅色散基本方程;然后利用线性啁啾光纤光栅对色散的补偿原理、特性及其局限性作了定性分析. 相似文献
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Ju Han Lee You Min Chang Young-Geun Han Sang-Hyuck Kim Haeyang Chung Sang Bae Lee 《Photonics Technology Letters, IEEE》2005,17(1):34-36
We experimentally demonstrate a simple and novel scheme for tunable real-repetition-rate multiplication, based on the combined use of fractional Talbot effect in a linearly tunable chirped fiber Bragg grating (FBG) and cross-phase modulation (XPM) effect in a nonlinear optical loop mirror (NOLM). By tuning the group-velocity dispersion of the chirped FBG fabricated with the S-bending method using a uniform FBG, we obtain high quality pulses at pseudorepetition rates of 20/spl sim/50 GHz from an original 8.5-ps 10-GHz soliton pulse train. We subsequently convert this pseudorate multiplication into a real-rate multiplication using XPM effect in an NOLM. A wavelength tuning is also achieved over a /spl sim/15-nm range. 相似文献
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We introduce a general approach for designing ultrabroadband arbitrary-order all-optical (all-fiber) time differentiators based on the use of fiber Bragg gratings (FBGs). Specifically, we numerically demonstrate that an Nth-order time differentiator can be implemented using a single specially apodized highly dispersive linearly chirped FBG operated in transmission. A concatenated reflection phase-shifted FBG is also required for implementing any odd-order differentiator. Our numerical simulations show that accurate and efficient time differentiation of optical signals with bandwidths up to a few hundreds of gigahertz can be realized using readily feasible FBG structures. 相似文献
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Novel FBG triangular filter for interrogating a FBG sensor in dynamic strain measurement 总被引:2,自引:0,他引:2
SHAO Li-yang SONG Jian-fei ZHANGA-ping HE Sai-ling 《光电子快报》2006,2(5):336-338
In recent years ,fiber Bragg gratings (FBGs) have at-tracted great considerationsinsensor applications .Inad-dition to the advantages of optical fiber sensors ,e.g.small size and i mmune to electromagnetic interference,FBGs possess flexible multiplexing c… 相似文献
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Electrical wavelength-tunable picosecond laser pulses were demonstrated in an actively mode-locked fiber ring laser with a linearly chirped fiber Bragg grating (FBG). Continuous wavelength tuning with a range of 7.2 or 5.8 mm was achieved by changing the modulation frequency respectively around 2.48 or 6.3 GHz. A pulsewidth of about 20 ps was obtained in the entire tuning range, which was limited mainly by the reflection bandwidth of the FBG 相似文献
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Electrically tunable dispersion compensator with fixed center wavelength using fiber Bragg grating 总被引:1,自引:0,他引:1
Ngo N.Q. Li S.Y. Zheng R.T. Tjin S.C. Shum P. 《Lightwave Technology, Journal of》2003,21(6):1568-1575
We present the design and development of a novel tunable dispersion compensator with fixed center wavelength that is based on the electrical adjustment of the chirp of a fiber Bragg grating (FBG). Both temperature gradient and strain gradient are employed to adjust the chirp of the FBG jointly. The electrical current flowing through the taper on-fiber thin-film heater will introduce a temperature gradient on the FBG. The shrinkage of a negative thermal expansion coefficient (NTEC) ceramic due to the temperature rise will compress the tapered FBG mounted inside it, and this will introduce a strain gradient on the FBG. The center wavelength of the FBG will be kept fixed because the effect of temperature rise on the FBG and the effect of compression of the FBG will offset each other. Applying an electrical power of less than 0.68 W, we demonstrate a linearly chirped FBG whose dispersion can be continuously adjusted from -178 ps/nm to -302 ps/nm with a central wavelength shift of as small as 0.16 nm. 相似文献
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提出了利用啁啾光纤布拉格光栅(FBG)和马赫增德尔调制器产生三角形光脉冲的优化方案.方案采用FBG模拟单模光纤的色散特性,结合光载波抑制调制产生了三角形光脉冲, 并通过仿真分析,选择FBG的长度、调制深度、适当的折射率切趾函数对三角形光脉冲的线性特征进行了优化.仿真结果表明,在同一啁啾系数下,产生的三角形光脉冲的失真程度随啁啾光纤光栅的调制深度增大而增大,光栅长度、折射率切趾函数对三角形光脉冲的影响也比较明显.与现有系统相比,由于将FBG引入系统,省去长距离的光纤,优化方案系统结构更为简单,三角形光脉冲线性特征更好. 相似文献
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