Polarization beam splitter on lithium niobate on insulator using a silicon nitride assisted waveguide

A polarization beam splitter (PBS) is proposed based on an asymmetric directional coupler consisting of a silicon nitride assisted waveguide and two ridge waveguides on a lithium niobate on insulator. Due to the silicon nitride buffer layer, the phase-matching condition is satisfied for TE polarizat...

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Bibliographic Details
Published in:Optical engineering 2022-12, Vol.61 (12), p.125102-125102
Main Authors: Ge, Daohan, Lv, Mengcheng, Shi, Jiakang, Zhou, Yujie, Cui, Guoxin, Zhang, Liqiang
Format: Article
Language:English
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Summary:A polarization beam splitter (PBS) is proposed based on an asymmetric directional coupler consisting of a silicon nitride assisted waveguide and two ridge waveguides on a lithium niobate on insulator. Due to the silicon nitride buffer layer, the phase-matching condition is satisfied for TE polarization, whereas TM polarization has a significant phase mismatch by choosing reasonable widths of three waveguides. A 112.2-μm-long PBS is designed, and the gap width is chosen to be 300 nm to make it easy to fabricate. Numerical simulations show that the designed PBS has a broad bandwidth (>80  nm) for an extinction ratio of >15  dB and an ultralow insertion loss (
ISSN:0091-3286
1560-2303
DOI:10.1117/1.OE.61.12.125102