Author Affiliations
Abstract
1 College of Engineering and Applied Sciences & National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
2 Department of Electrical and Computer Engineering, Rutgers University, Piscataway, New Jersey 08854, USA
3 Institute for Advanced Materials, Devices, and Nanotechnology, Rutgers University, Piscataway, New Jersey 08854, USA
4 School of Mathematics and Physics & Chemical Engineering, Changzhou Institute of Technology, Changzhou 213002, China
Parallel-coupled dual-racetrack silicon microresonators can potentially be used for quadrature amplitude modulation. We analyze the evolution of the coverage of coherent output states of devices with varying device parameters. As the coupling constant increases, the coverage of coherent states initially improves then degrades, which is unexpected based on a prior preference for overcoupling. Increasing the quality factor generally improves the coverage. The influence of the refractive index modulation is found to saturate after reaching a certain level. Analytic formulas are developed to provide insight into the coverage evolution. These results are fairly robust against a small asymmetry of device parameters.
230.5750 Resonators 250.7360 Waveguide modulators 250.4745 Optical processing devices Chinese Optics Letters
2016, 14(10): 102304
基于菲涅尔波带片透镜的设计原理,设计了三款多层介质结构的菲涅尔波带片天线.该天线采用高增益的波纹喇叭天线提供馈电,工作频段为太赫兹通信第一大气窗口320~380GHz,回波损耗低于-15dB,增益大于25dBi.研究了菲涅尔波带片天线的周期数和子区数对天线性能的影响,结果表明随着周期和子区数的增加,增益也会不断的提高,而当波带片直径和喇叭口径面积相比拟时,电磁波损耗较大,并且谐振频率在太赫兹大气窗口内右移.
太赫兹 菲涅尔波带片 波纹喇叭天线 多层介质 THz Fresnel zone plate corrugated horn multielectric
针对光码分多址系统对地址码的要求, 通过改进的Tent映射产生混沌扩频序列, 将序列作为系统中的用户地址码; 搭建光码分多址系统, 分析混沌码与素数码相比下的系统性能。结果表明, 产生的混沌序列有良好的相关性和初值敏感性, 可以有效抑制系统的多址干扰并增强系统安全性; 在2.5Gb/s的传输速率下, 使用混沌序列码的光码分多址系统较素数码系统最小误码率提高1~3个数量级; 同时较传统光正交码的系统误码率性能也可提高1~2个数量级。
混沌序列 光码分多址 误码率 相关性 光正交码 chaotic sequence optical code division multiple access bit error rate correlation optical orthogonal code
重庆邮电大学微光机电系统研究所, 重庆 400065
为了有效抑制多用户干扰,采用改良双重码构建了基于新型平衡检测技术的光码分多址系统。使用归零与非归零脉冲发生器,在不同传输长度和传输比特率下对比系统性能,并对平衡检测和光谱直接检测技术进行了比较。通过系统测试得出:在2.5Gbit/s的传输比特率下,采用改良双重码编码的新型平衡检测技术的性能优于光谱直接检测技术,并且能够有效地消除多址干扰。
光码分多址 改良双重码 平衡检测技术 光谱直接检测技术 OCDMA MDW code complementary subtraction technology SDD technology
