Low-loss segmented joint structure between a slab waveguide and arrayed waveguides designed by simple optimization method

K. Shibuya, N. A. Idris, H. Asakura, H. Tsuda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Arrayed-waveguide gratings (AWG) are key devices in optical communication systems using wavelength division multiplexing (WDM), and it is essential that these AWGs are low-loss. In this paper, we propose low-loss segmented joint structures between the slab waveguide and the waveguide array in an AWG. The effectiveness of these structures is confirmed by the measurement results. In addition, improvements in the loss uniformity can be obtained by utilizing mode converting segmented structures between the waveguide array and the slab waveguide on the output side. Moreover, the passband can be flattened by employing such a structure between the input and slab waveguides. These structures were designed using the same simple calculation and optimization method. Using these optimized structures, the transmittance was improved by 17%, the largest difference in insertion loss was reduced by 1.93 dB, and the 1-dB bandwidth was extended by 20%. These structures can be fabricated with ordinary planar lightwave circuit (PLC) technologies without the need for special fabrication processes.

Original languageEnglish
Title of host publicationIntegrated Optics
Subtitle of host publicationDevices, Materials, and Technologies XIX
EditorsJean-Emmanuel Broquin, Gualtiero Nunzi Conti
ISBN (Electronic)9781628414554
Publication statusPublished - 2015
EventIntegrated Optics: Devices, Materials, and Technologies XIX - San Francisco, United States
Duration: 2015 Feb 92015 Feb 11

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherIntegrated Optics: Devices, Materials, and Technologies XIX
Country/TerritoryUnited States
CitySan Francisco


  • arrayed-waveguide grating
  • optical communication
  • optical waveguide
  • optimized calculation
  • planar lightwave circuit
  • wavelength division multiplexing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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