Study on Silicon-Based Polarization Converter Using Asymmetric Slot Waveguide

A compact optical polarization converter (PC) based on slot waveguide has been proposed in this study. Utilizing the high refractive index contrast between a Si waveguide and SiO2 cladding on the silicon-on-insulator platform, the light beam can be strongly confined in a slot waveguide structure. Th...

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Veröffentlicht in:IEICE Transactions on Electronics 2020/11/01, Vol.E103.C(11), pp.605-608
Hauptverfasser: ZHANG, Zejun, TSUJI, Yasuhide, EGUCHI, Masashi, CHEN, Chun-ping
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container_issue 11
container_start_page 605
container_title IEICE Transactions on Electronics
container_volume E103.C
creator ZHANG, Zejun
TSUJI, Yasuhide
EGUCHI, Masashi
CHEN, Chun-ping
description A compact optical polarization converter (PC) based on slot waveguide has been proposed in this study. Utilizing the high refractive index contrast between a Si waveguide and SiO2 cladding on the silicon-on-insulator platform, the light beam can be strongly confined in a slot waveguide structure. The proposed PC consists of a square waveguide and an L-shape cover waveguide. Since the overall structure is symmetrically distributed along the axis rotated 45-degree from the horizontal direction, the optical axis of this PC lies in the direction with equi-angle from two orthogonally polarized modes of the input and output ends, which leads to a high polarization conversion efficiency (PCE). 3D FDTD simulation results illustrate that a TE-to-TM mode conversion is achieved with a device length of 8.2 µm, and the PCE exceeds 99.8%. The structural tolerance and wavelength dependence of the PC have also been discussed in detail.
doi_str_mv 10.1587/transele.2019ESS0002
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subjects Converters
finite difference time domain method
Horizontal orientation
Light beams
Optical polarization
polarization converter
Refractivity
Silicon dioxide
slot waveguide
Waveguides
title Study on Silicon-Based Polarization Converter Using Asymmetric Slot Waveguide
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