Abstract
We investigated an all-optical phase shifter and switch based on a graphene decorated side-polished twin-core fiber (TCF) Michelson interferometer (MI). The MI was fabricated by tapering the splicing point between the TCF and single-mode fiber. The flat surface of exposed polished core in the TCF was coated with monolayer graphene. A 980 nm pump laser is used to produce a photothermal effect. The graphene’s ohmic heating changes the effective refractive index of the exposed core, resulting in the phase shift of the MI. The MI with a polished length of 5 mm has a significant modulation phase shift with a nearly linear slope of ${0.0102}\;\pi / {\rm mW}$ near the wavelength of 1550 nm and can obtain an extinction ratio of 7 dB for optical switching with a rise (fall) time of 55.8 ms (15.5 ms). The high-density integration and all-optical control enable the proposed device to have great potential in the miniaturization of optical devices and all-optical signal processing.
© 2019 Optical Society of America
Full Article | PDF ArticleMore Like This
Xuetao Gan, Chenyang Zhao, Yadong Wang, Dong Mao, Liang Fang, Lei Han, and Jianlin Zhao
Optica 2(5) 468-471 (2015)
Xinghua Yang, Qunlong Long, Zhihai Liu, Yu Zhang, Jun Yang, Depeng Kong, Libo Yuan, and Kyunghwan Oh
Opt. Lett. 44(5) 1092-1095 (2019)
Yutao Bo, Chunying Guan, Rang Chu, Tailei Cheng, Li Xu, Lu Liu, Jing Yang, Jinhui Shi, Pengfei Wang, Jun Yang, and Libo Yuan
Opt. Express 29(5) 6854-6862 (2021)