Reconfigurable Three-Mode Converter Based on Cascaded Electro-Optic Long-Period Gratings

Wei Jin; Kin Seng Chiang

doi:10.1109/JSTQE.2020.2969568

Author(s)

Wei Jin
Kin Seng Chiang

Related Research Unit(s)

Department of Electrical Engineering

Detail(s)

Original language	English
Article number	4500906
Journal / Publication	IEEE Journal on Selected Topics in Quantum Electronics
Volume	26
Issue number	5
Online published	29 Jan 2020
Publication status	Published - Sept 2020

Link(s)

DOI	DOI https://doi.org/10.1109/JSTQE.2020.2969568 Final Published version
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Attachment(s)	Documents 44973047.pdf Post-print, 743 KB, PDF Publisher's Copyright Statement COPYRIGHT TERMS OF DEPOSITED POSTPRINT FILE: © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Jin, W., & Chiang, K. S. (2020). Reconfigurable Three-Mode Converter Based on Cascaded Electro-Optic Long-Period Gratings. IEEE Journal on Selected Topics in Quantum Electronics, 26(5), [4500906]. https://doi.org/10.1109/JSTQE.2020.2969568.
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85079773976&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(d8ff161f-38ee-45d5-82d3-379cee4a6224).html

Abstract

We propose an optical waveguide switch to realize complete reconfigurable mode conversion for three spatial modes. This device consists of three cascaded long-period grating mode converters of different types integrated along a three-mode lithium-niobate (LiNbO₃) waveguide, where the gratings can be electro-optically controlled to activate mode conversion independently. We fabricate the device with z-cut LiNbO₃, which employs graphene electrodes to drive the gratings and an electrode heater to achieve wavelength matching for the three gratings. The half-π voltages of the three gratings in a typical fabricated device, which is 26 mm long and operates at 1545 nm, are 48, 37, and 43 V, respectively. The proposed mode switch could find applications in reconfigurable mode-division-multiplexing communication systems based on few-mode fibers and other areas where programmable mode conversion is required.