Broadband polarization splitter-rotator on lithium niobate-on-insulator platform

Polarization splitter-rotators (PSRs) are crucial components for controlling the polarization states of light in polarization-division multiplexing systems. However, current PSRs on the lithium niobate-on-insulator (LNOI) platform suffer from fabrication difficulty in high-precision shallow-etching...

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Bibliographic Details
Published in:IEEE photonics technology letters 2023-01, Vol.35 (1), p.1-1
Main Authors: Deng, Chunyu, Zhu, Wanghua, Sun, Yu, Lu, Mengjia, Huang, Lei, Wang, Dongyu, Hu, Guohua, Yun, Binfeng, Cui, Yiping
Format: Article
Language:English
Subjects:
Bandwidth
Bandwidths
Broadband
Electric fields
Etching
Insertion loss
Integrated optics
Lithium niobates
LNOI
Multiplexing
Optical device fabrication
Optical polarization
Optical waveguides
Polarization
polarization splitter-rotator
Strips
waveguide
Waveguides
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Summary:Polarization splitter-rotators (PSRs) are crucial components for controlling the polarization states of light in polarization-division multiplexing systems. However, current PSRs on the lithium niobate-on-insulator (LNOI) platform suffer from fabrication difficulty in high-precision shallow-etching and minimal feature size. In this paper, a large-bandwidth PSR is proposed based on LNOI strip-waveguide which only requires a single full etching step. The device is composed of an adiabatic taper, a Y-splitter, and a multi-mode interferometer. The minimal feature size is larger than 500 nm, which greatly reduces the difficulty of etching. Experimental results show that the insertion loss of such PSR is less than 1.5 dB with a polarization extinction ratio (PER) of more than 20 dB in a wide wavelength range of 1514-1640 nm for the TE 0 mode. Additionally, a PER of 10 dB over 47 nm bandwidth (1502-1549 nm) for the TM 0 mode is also demonstrated with our device. This LNOI-based PSR is promising in on-chip polarization-division multiplexing optical transmissions.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2022.3215268