Optical Switch Based on Ge2Sb2Se4Te1-Assisted Racetrack Microring

• DOI: 10.3390/photonics9020117
• Publication Date: 2022-02-21T13:23:29Z
• Authors: Yan Xu; Songyue Liu; Tingyu Liu; Yang Gao; Yuexin Yin; Xiaoqiang Sun; Daming Zhang
• Keywords: Extinction ratio; Waveguide; Crossover switch

In this work, we have proposed and designed a 1 × optical switch based on the phase-change material, Ge2Sb2Se4Te1 (GSST), for GSST-assisted silicon racetrack microring. Its power can periodically be exchanged between straight waveguide GSST/Si hybrid due to formed directional coupling structure. By changing GSST from crystalline state amorphous state, shifts ON OFF vice versa. With finite-difference time-domain method optimization, shows an extinction ratio of 18 dB at 1547.4 nm. The insert losses states are both less than dB. unit has potential build N matrix.