Passive polarization splitter using zero-gap directional coupler in LiNbO3

Sattibabu, Romala; Dey, Pradip; Bhaktha, S.N.B.; Ganguly, Pranabendu

doi:10.1016/j.rio.2022.100262

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2022

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“…ADCs have been shown to be a promising PBS structure on SOI 17 because of a large birefringence of the waveguide on SOI. But there are fewer PBSs 18 , 19 on the lithium niobate on insulator (LNOI) compared with SOI because of a smaller waveguide birefringence, which leads to a worse performance for the same structure. Perhaps the reason is that the SOI platform has a stronger structure birefringence compared with the LNOI platform, and the material birefringence of lithium niobate (LN) can be managed to compensate for the structure birefringence 20 .…”

Section: Introductionmentioning

confidence: 99%

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

Shi

et al. 2022

Opt. Eng.

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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 (<0.35 dB).

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Section: Introductionmentioning

confidence: 99%

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

Shi

et al. 2022

Opt. Eng.

View full text Add to dashboard Cite

show abstract

Passive polarization splitter using zero-gap directional coupler in LiNbO3

Cited by 1 publication

References 39 publications

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

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

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