基于光子晶体慢光实现光缓存  

Realization of photonic crystal slow-light-based optical buffers

作　　者：齐菡 施伟华[1] 

机构地区：[1]南京邮电大学光电工程学院,南京210046

出　　处：《光通信研究》2014年第4期43-45,共3页Study on Optical Communications

基　　金：国家自然科学基金资助项目(61275067);江苏省高校自然科学研究项目(12KJB510018)

摘　　要：慢光技术是实现全光网络中光缓存器件的关键技术,为了实现具有较低群速度、较大带宽的慢光,设计了一种基于二维正方晶格介质柱旋转-45°形成线缺陷的新型波导结构,实现了慢光传输并将其应用于光缓存技术中。通过改变介质柱的半径和波导宽度可进一步优化慢光性能,利用基于超晶胞的平面波展开法进行计算仿真,得到缺陷模的色散曲线,并详细分析了光在波导中的传输群速度和群速度色散的性质,实现了最大群速度仅为0.007 89c（c为光在真空中的传播速度）,并且群速度色散在-106~106 ps2/km范围内。将所设计的长度为1mm的光子晶体结构应用到光缓存中,可以实现的最大缓存时间为2.778ps,最大缓存容量达145.98bit。Slow-light technology is a key technology for realizing optical buffers in all-optical networks.In order to realize slow light with low group velocity and large bandwidth,this paper designs a novel waveguide structure,which is based on two-dimensional square lattices with the dielectric cylinder rotated by-45°so as to produce line defects,achieves slow light transmission and applies it to the optical buffer technology.In addition,it optimizes the slow light performances of the structure further by changing the radius of the dielectric cylinder and the width of the waveguide,conducts calculation and simulation by using the supercell-based plane wave expansion method,obtaining the dispersion curve of the defected mode.Furthermore,it analyzes in detail the properties of transmission group velocity and group velocity dispersion of light in waveguide and achieves the maximum group speed of only 0.007 89 c（cis the speed of light in vacuum）,and the group velocity dispersion in the range-106~106 ps2/km.When a designed 1mm-long photonic crystal structure is applied to the optical buffer,it can achieve the maximum cache time of 2.778 ps and the maximum cache capacity of 145.98 bit.

关 键 词：光子晶体 慢光 光缓存器 

分 类 号：TN252[电子电信—物理电子学]