一种宽带低啁啾z切Ti∶LiNbO_3调制器(英文)  

Broadband Ti:LiNbO_3 Modulator with Low FrequencyChirp

作　　者：张阜文[1] 陈福深[1] 邱昆[1] 薛飞[1] 

机构地区：[1]电子科技大学宽带光纤传输与通信系统技术国家重点实验室,成都610054

出　　处：《光电子．激光》2004年第9期1016-1020,共5页Journal of Optoelectronics·Laser

基　　金：SupportedbytheNationalNaturalScienceFoundationofChina (60 0 770 30 )

摘　　要：对正常型和反转极化型LiNbO3 波导在任意方向加电场 ,由线性电光效应引起的折射率的变化做了计算分析 ,结果发现只有在z方向加电场 ,LiNbO3 两波导臂折射率的变化才是完全相反的。实验验证得到了同样结论。提出一种利用反转技术、厚电极制作和脊型结构的新型宽带低啁啾的LiNbO3 调制器。计算结果表明 ,在实现光波和微波速度匹配情况下 ,当器件的微波损耗系数为 0 .15dB/ (cm·GHz) ,以及正常型和反转极化型LiNbO3 波导长度相等时 ,其频率啁啾参数非常小 ,4 0GHz时约为 0 .1。The refractive index changes induced by the linear electro-optic effect in normal-poled and reverse-poled LiNbO3 wave-guides were calculated, and the results show that the refractive index changes in two arms are opposite to each other when the electric field is applied in + z direction, which agree with the experimental results. In order to obtain large bandwidth and low frequency chirp, a novel Ti: LiNbO3 modulator with inversion domain, thick electrodes and ridge structure was proposed. The calculation results show that the frequency chirp parameter is about 0.1 at the frequency of 40 GHz in the case of the microwave loss coefficient of 0.15 dB/(cm &middot √GHz), the same length of normal-poled and reverse-poled LiNbO3 wave-guides, and velocity matching between the optical wave and the microwave.

关 键 词：LINBO3调制器 频率啁啾 波导 宽带 极化 电光效应 折射率 光波 电场 相等 

分 类 号：TN929[电子电信—通信与信息系统] TN256[电子电信—信息与通信工程]