Work

High-performance and ultra-wide bandwidth silicon TM polarizer with suppressed reflection utilizing a tailored contra-mode conversion Bragg grating

Year: 2024

Type: article

Abstract: We present a compact TM polarizer with high polarization extinction ratio (PER), low loss and suppressed reflection over an ultra-wide bandwidth on a 220-nm silicon-on-insulator (SOI) platform. The device utilizes a contra-mode conversion Bragg grating with strong polarization-dependence embedded in a multimode waveguide. Through a sophisticated grating design incorporating tailored chirping and apodization profiles to match modal properties, we have achieved, by simulation, an ultra-wide bandwidth of 346 nm with PER>40dB and IL<1dB, a 5-fold increase over our previous design, as well as an ultra-high PER>55dB and low insertion loss (IL<0.35dB) at 1550nm. Particularly notable is the polarizer's ability to suppress reflection to <-15dB across an extended bandwidth exceeding 450nm. Experimental measurements confirm excellent performance of the fabricated TE polarizer, with IL<1.2dB (0.5dB) and PER>30dB over a bandwidth of 336nm (268nm).

Source: Optics Letters

DOI: 10.1364/ol.537699

Authors: Shengbao Wu, Qianli Yu, Lei Zhang, Zhenzhao Guo, Jinbiao Xiao, X. Steve Yao

Institutions: Hebei University, Southeast University

Language: English

Topic: Photonic and Optical Devices

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Funders: National Natural Science Foundation of China, Natural Science Foundation of Hebei Province

Awards: G2880464893, G3580554285, G5721800798