Mode Multiplexer with Cascaded Vertical Asymmetric Waveguide Directional Couplers

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)2903-2911
Journal / PublicationJournal of Lightwave Technology
Issue number14
Online published23 Apr 2018
Publication statusPublished - 15 Jul 2018



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

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