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).
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Yao et al. (2024) studied this question.
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