Mode Multiplexer With Cascaded Vertical Asymmetric Waveguide Directional Couplers

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

48 Citations (Scopus)


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-mode 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 E13modes. 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.
Original languageEnglish
Pages (from-to)2903-2911
Number of pages9
JournalJournal of Lightwave Technology
Issue number14
Publication statusPublished - 15 Jul 2018
Externally publishedYes


  • Integrated optics devices
  • multiplexing
  • optical polymer
  • optical waveguide components
  • optical waveguide couplers

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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