基于宽度调制谐振腔的光子晶体电光调制器

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...

Photonic crystal electro-optic modulator based on width modulation resonator

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.