【摘 要】
：
We report the adaptive compensation experiment of polarization mode dispersion (PMD) for 10-Gb/s non return-to-zero (NRZ) and return-to-zero (RZ) optical communication systems using a two-stage PMD compensator and the monitoring technique based on degree
【机 构】
：
DepartmentofPhysics,SchoolofScience,BeijingUniversityofPostsandTelecommunications,Beijing100876
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
We report the adaptive compensation experiment of polarization mode dispersion (PMD) for 10-Gb/s non return-to-zero (NRZ) and return-to-zero (RZ) optical communication systems using a two-stage PMD compensator and the monitoring technique based on degree of polarization (DOP) feedback-signals. The DOP monitor has its advantages of bit-rate independent and modulation format independent. The twostage compensator has the capacity of compensation for the first- and second-order PMD. The compensated differential group delay (DGD) is up to 80 ps, and compensated principal state of polarization rotation rate is 20 ps. The time used for compensation is less than 1 second.
其他文献
介绍了机载环境下紫外像增强管的几种典型早期失效问题, 对失效机理进行了分析, 提出了消除失效隐患的对策措施。实践证明, 采取对应措施后, 某型紫外像增强管的早期失效率显著下降。
作为空间可见光相机的主要承载结构，机身桁架结构对于保证机身的力学性能至关重要。为了保证空间相机机身的结构刚度和稳定性， 针对机身桁架结构设计进行了研究。研究了桁架的基本结构，分析了支杆力学性能的影响因素，探讨了支杆长度和角度对该机身桁架力学性能的影响。分 析了支杆数量、支撑位置和分布形式对机身力学性能的影响，并分析了“Δ”型和“X”型桁架结构的特点。通过选择合理的支杆数量和分布形式，保 证了机身桁架的力学性能。然后在设计分析的基础上进行了力学试验，验证了机身的力学性能。试验结果表明，该桁架结构的设计能够获
As an extension of the Mie lidar technique to measure the extinction coefficient of the surface particles, a horizontally pointing Mie lidar is used for determining the optical properties of Asian dust, which is an approach without knowing the actual lida
表面等离激元弯曲光束（SPB）作为一种局域在金属表面传输的特殊光束，在光子操控和光学捕获等方面有着特殊的应用潜力。应用相位匹配法，设计了几种金属纳米狭缝阵列（V形、N形、M形及M V形）结构，调控产生了SPB；讨论了入射光波偏振角度和结构参数对SPB电场强度的调控影响。以M形结构为例，讨论了结构臂之间的夹角、结构参数及结构间的耦合对SPB的影响。结果表明：不同结构产生的SPB电场强度随入射光波偏振角度的变化满足正弦函数分布；SPB电场强度分布受到结构臂之间的夹角、结构参数及结构间的耦合影响。用偶极子远场辐
A novel microring resonator sensor coated with a single negative metamaterial (SNM) layer is proposed. The dispersion relation of hollow cylindrical dielectric waveguide covered with a SNM layer is derived, and resonant frequencies of the corresponding wh
The review of recent theoretical and experimental research on the complex surface chemistry processes that evolve from low-Z material conditioning on plasma-facing materials under extreme fusion plasma conditions is presented. A combination of multi-scale
针对传统光谱测油仪存在的环境适应能力弱、 分析速度慢、 测量重复性差等问题, 研制了一种便携式中红外水中油浓度速测仪。 其核心光路采用典型的非对称折叠式M型Czerny-Turner光学结构, 有效缩小仪器体积; 使用周期性转动的斩光器调制红外光源, 并对斩光器转速进行数字PID控制, 调制精度达到±0.5%; 采用固定光栅作为分光元件, 无需光栅扫描装置且不存在转动误差; 利用新型MEMS红外线传感器阵列探测调制后的光谱信号, 显著提高光谱采集速度。 光学仿真及实验结果表明仪器光谱范围为2 800～3
Broad-area diode lasers usually supply high output power but low lateral beam quality. In this Letter, an on-chip combined angled cavity is proposed to realize narrow lateral far field patterns and high brightness. The influence of included angles, emitti
本文采用了一种特别的多模电-声子耦合模型,利用室温光谱数据估算可调谐激光晶体的黄昆-里斯(Huang-Rhys)S因子,并与单模耦合模型的结果作了比较.最后,还讨论了S因子与晶场强度及基质晶体价键特性之间的关系.
Based on the transverse second-harmonic generation(TSHG) effect, we demonstrate a method for in-situ modal inspection of nonlinear micro/nanowaveguides. Pumping lights are equally split and coupled in