Polarization-insensitive and high-efficiency edge coupler for thin-film lithium niobate

Polarization-insensitive and high-efficiency edge coupler for thin-film lithium niobate

In this Letter, we propose and demonstrate a fiber-to-chip edge coupler (EC) on an x-cut thin film lithium niobate (TFLN) for polarization-insensitive (PI) coupling. The EC consists of three width-tapered full-etched waveguides with silica cladding and matches well with a single-mode fiber (SMF). Th...

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Veröffentlicht in:Optics letters 2024-05, Vol.49 (10), p.2537-2540
Hauptverfasser: Guo, Zehao, Liu, Weixi, Wen, Chengfeng, Song, Lijia, Liu, Liu, Dai, Daoxin, Shi, Yaocheng
Format: Artikel
Sprache:eng
Schlagworte:
Couplers
Coupling
Lithium niobates
Misalignment
Polarization
Thin films
Waveguides
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Zusammenfassung:In this Letter, we propose and demonstrate a fiber-to-chip edge coupler (EC) on an x-cut thin film lithium niobate (TFLN) for polarization-insensitive (PI) coupling. The EC consists of three width-tapered full-etched waveguides with silica cladding and matches well with a single-mode fiber (SMF). The measured results show that the minimum coupling losses for TE /TM modes remain to be 0.9 dB/1.1 dB per facet, and the polarization dependent loss (PDL) is
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.520812