Author(s): Zhang, L (Zhang, L.); Fu, X (Fu, X.); Yang, L (Yang, L.)

Source: IEEE PHOTONICS JOURNAL Volume: 12 Issue: 5 Article Number: 6601906 DOI: 10.1109/JPHOT.2020.3025017 Published: OCT 2020

Abstract: We propose a compact, broadband, and low-loss polarization beam splitter (PBS) based on an asymmetrical directional coupler on the lithium-niobate-on-insulator platform, consisting of an amorphous silicon (a-Si) assisted waveguide, and a normal waveguide. With proper design of the a-Si nanowire, and lithium niobate waveguides, the phase-matching condition is satisfied for TE polarization, while significant mismatching exists for TM polarization. A 16-mu m-long PBS (including the s-bend region) with a 200 nm gap is achieved. Numerical simulations show that the PBS exhibits a 140-nm bandwidth for extinction ratios lager than 10 dB. Moreover, the device has an ultra-low insertion loss (IL similar to 0.05 dB), and maintaining ILs < 0.5 dB over a 170 nm wavelength range.

Accession Number: WOS:000577882100004

ISSN: 1943-0655

eISSN: 1943-0647

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