Mode Multiplexer with Cascaded Vertical Asymmetric Waveguide Directional Couplers

Quandong Huang; Yunfei Wu; Wei Jin; Kin Seng Chiang

doi:10.1109/JLT.2018.2829143

Author(s)

Related Research Unit(s)

Department of Electrical Engineering

Detail(s)

Original language	English
Pages (from-to)	2903-2911
Journal / Publication	Journal of Lightwave Technology
Volume	36
Issue number	14
Online published	23 Apr 2018
Publication status	Published - 15 Jul 2018

Link(s)

DOI	DOI https://doi.org/10.1109/JLT.2018.2829143 Final Published version
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Attachment(s)	Documents 23725022.pdf Post-print, 997 KB, PDF Publisher's Copyright Statement © 2018 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. Huang, Q., Wu, Y., Jin, W., & Chiang, K. S. (2018). Mode Multiplexer with Cascaded Vertical Asymmetric Waveguide Directional Couplers. Journal of Lightwave Technology, 36(14), 2903-2911. https://doi.org/10.1109/JLT.2018.2829143.
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85045745894&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(170c7174-5eb6-4a8f-bac5-066ada6c868e).html

Abstract

We report a mode (de)multiplexer based on the structure of cascaded vertical waveguide directional couplers, where the spatial modes of a few-mode core are coupled to various single-mode cores placed above the few-core core. Using five cascaded directional couplers, we design and fabricate a six-mode (de)multiplexer with polymer material that can spatially combine or separate the E₁₁, E₂₁, E₁₂, E₂₂, E₃₁, and E₁₃ modes. A typical fabricated device, which has a length of 29 mm, provides coupling ratios varying from 62% to 90% and modal crosstalks from −28.2 to −11.6 dB in the wavelength range from 1530 to 1565 nm with weak polarization dependence. The proposed structure is simple and scalable and could be developed into a range of mode-controlling devices for mode-division-multiplexing applications based on few-mode fibers.

Research Area(s)

Couplings, Integrated optics devices, multiplexing, Optical fiber couplers, Optical fiber devices, Optical fiber polarization, optical polymer, optical waveguide components, optical waveguide couplers, Polymers