基于宽度调制谐振腔的光子晶体电光调制器  

Photonic crystal electro-optic modulator based on width modulation resonator

作　　者：项彤[1] 陈鹤鸣 胡宇宸 XIANG Tong;CHEN Heming;HU Yuchen(College of Electronic and Optical Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;Bell Honors School,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学电子与光学工程学院,南京210023 [2]南京邮电大学贝尔英才学院,南京210023

出　　处：《光通信技术》2021年第2期46-50,共5页Optical Communication Technology

基　　金：国家自然科学基金(61571237)资助;江苏省自然科学基金(BK20151509)资助。

摘　　要：针对目前电光调制器插入损耗高的问题,提出了一种基于宽度调制(WM)型谐振腔的光子晶体电光调制器。该器件由输入端纳米线波导、硅基光子晶体波导和WM型谐振腔组成,前二者的连接处采用锥形结构,用于减少2种波导之间的级联损耗。根据时域耦合模理论与等离子体色散效应,采用WM型谐振腔和PN掺杂结构实现对横电(TE)模的调制,并应用二维时域有限差分法对其性能进行仿真分析。仿真结果表明:该器件在调制电压为1.24 V时可以实现中心波长为1553.91 nm的TE模窄带通断调制功能;在工作波长为1550~1560 nm时的插入损耗为0.16 dB,消光比为19.73 dB,调制深度为0.9894,Q值达1.5×104,尺寸约为20μm×9μm。Aiming at the problem of high insertion loss of current electro-optic modulator,a photonic crystal electro-optic modulator based on a width modulation(WM)cavity is proposed in this paper.The device is composed of a nanowire waveguide at the input port,silicon-based photonic crystal waveguide and a WM-type resonator.The connection between the first two structures uses a tapered structure to reduce the cascade loss between two different waveguides.According to the time-domain coupled mode theory and plasma dispersion effect,WM-type resonant cavity and PN doping structure are used to realize the modulation of transverse electric(TE)mode.The performance is simulated and analyzed by two-dimensional finite difference time domain method.The simulation results show that the device can realize the TE mode narrow-band on-off modulation function with a center wavelength of 1553.91 nm when the modulation voltage is 1.24 V.The insertion loss is 0.16 dB at 1550~1560 nm,and the extinction ratio is 19.73 dB.The modulation depth is 0.9894,the Q value reaches 1.5×104,and footprint is about 20μm×9μm.

关 键 词：宽度调制 光子晶体 耦合模理论 电光调制 锥形结构 

分 类 号：TN256[电子电信—物理电子学]