【摘 要】
：
Experimental research of simultaneous tunable chromatic dispersion (CD) and adaptive polarization mode dispersion (PMD) compensations in optical fiber communication system was reported. Two different nonlinearly chirped fiber Bragg gratings fabricated thr
【机 构】
：
SchoolofScience,BeijingUniversityofPostsandTelecommunications,Beijing100876
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
Experimental research of simultaneous tunable chromatic dispersion (CD) and adaptive polarization mode dispersion (PMD) compensations in optical fiber communication system was reported. Two different nonlinearly chirped fiber Bragg gratings fabricated through the equivalent chirp technology were adopted in the experiment. One of the gratings was used as CD compensator, with a tunable dispersion range from 300 to 600 ps/nm. The other made of photosensitive polarization maintaining fiber was used as a tunable delay line of PMD compensator, which provided a varying amount of differential group delay (DGD) from 40 to 110 ps. Our experiment was operated at 10-Gb/s non-return-to-zero (NRZ) system and the results showed that the eye pattern recovery is excellent after both PMD and CD are compensated. Especially, the power penalty at a bit error rate (BER) of 10^(-9) is about 1 dB.
其他文献
We report the generation of asymmetric Mathieu beams: invariant intensity optical profiles that can be described by three parameters. The first one describes the amount of ellipticity, the second one takes into account the degree of asymmetry of the profi
Typical fundus photography produces a two-dimensional image. This makes it difficult to observe the microvascular and neural abnormalities, because the depth of the image is missing. To provide depth appreciation, we develop a single-channel stereoscopic
下星期（9月18~20日)在纽约召开的1973年电光学会议上，预期有两篇报告将引起人们很大的兴趣，一篇是关于激光脉冲在大气中传输的损耗极低的方法，另一篇是关于微瓦液晶调制器的概念。这两篇文章是根据奥兰多佛罗里达技术大学正在进行的研究写成的。
采用基于逐次散射法的矢量辐射传输模型，通过求解矢量辐射传输方程，分析了影响海面上空气溶胶光学参数反演的主要因素。根据海洋大气气溶胶模型，通过构建多参数的反射率和偏振反射率查找表，给出了用于海上气溶胶光学参数反演的查找表迭代查找法。利用自主研制的多角度航空偏振相机在渤海湾上空航拍的偏振辐射数据，反演获得了该海域550 nm波段的气溶胶光学厚度和ngstrm波长指数，其均值分别为0.441和1.15。通过与布置在京津塘周边的多个地基CE318太阳辐射计同步观测数据进行的对比校验发现，两者间具有很好的一致性
Elastic cartilage in the rabbit external ear is an important animal model with attractive potential value for researching the physiological and pathological states of cartilages especially during wound healing. In this work, nonlinear optical microscopy b
薄膜滤光片在斜入射使用时，s偏振光和p偏振光的特性会产生分离：两偏振光的中心波长不一致，且s偏振光的通带宽度要小于p偏振光。而采用多种材料且满足特定条件的膜系结构，可使角度入射滤光片两偏振方向的特性趋于一致。通过理论分析，建立了两偏振光反射率的表达式，由表达式可看出非偏振的条件。通过计算，求出相应材料折射率值，从而设计出消偏振的膜系。对一个三腔129层实例膜系进行了计算求解、仿真分析及误差分析。最后的结果验证表明此方法是可行的。
By measuring the emission spectra and the fluorescence lifetime of the 4I13=2 state of Er3 ions in Gd2SiO5 crystal at different temperatures, the effects of temperature on the spectra and the lifetime of the 4I13=2 state are investigated. When the temper
基于相对论电子在光场和静态磁场作用下的能量方程和洛仑兹方程,分析了自由电子激光器运转的位相条件。结果表明,入射光波相对于相对论电子束的初位相ψ在第1和第4象限,相对论电子的能量将主要表现为能量减低,初位相ψ在第2和第3象限主要表现为使相对论电子进一步被加速。
本文分析并研究了用相位复共轭进行单根多模光纤传像时的光线偏振特性及其对像传输的影响.提出了检偏滤波方法,用这种方法可以十分有效地减少噪声,提高图像质量.本文给出了理论分析及实验结果,获得40linls/mm分辨率的传输图像.
本文叙述了用空腔(同轴)灯来泵浦圆柱棒钕玻璃的空腔灯泵浦激光器的实验装置与测试结果,并把它们与常用的椭圆聚光罩直管灯泵浦激光器的实验结果进行了比较.