High performance TM-pass polarizer using multimode Bragg grating waveguide

• DOI: 10.1364/oe.520833
• Publication Date: 2024-03-13T15:00:18Z
• Authors: ZhengYing Xu; Bin Tu; Hao Liu
• Keywords: Polarizer; Fiber Bragg Grating; Waveguide; PHOSFOS

A novel ultra-broadband TM-pass polarizer with high polarization extinction ratio (PER) and low reflection has been proposed demonstrated by utilizing multimode Bragg grating waveguide (MBGW) two tapered waveguides. By optimizing the period of MBGW, injected TE 0 mode is coupled into backward 2 effectively leaked cladding. Meanwhile, TM propagates through without any negative impact. The operation bandwidth can be significantly expanded cascading multiple MBGW structures, each which operates at a different central wavelength. simulation results indicate that designed achieve an insertion loss (IL) below 0.24 dB PER above 39 simultaneously across 300 nm (1400 nm∼1700nm), while reflected signal −9.1 dB. experiment demonstrate fabricated realize IL 0.56 33 in 160 ranging from 1470 to 1630 nm. Due limitations equipment used, measurements for other wavelength ranges are not conducted. With these merits, device would find significant applications optical communication systems.