Small bend structures using trenches filled with low-refractive index material for miniaturizing silica planar lightwave circuits

Jiro Ito, Hiroyuki Tsuda

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We have proposed the fabrication of small bend structures using trenches along both sides of the core, filled with low-refractive index material, in order to miniaturise silica planar lightwave circuits. The minimum bending radius of a silica waveguide was reduced from 2 mm to 200 μm by filling the trenches with low-refractive index material. The local lateral relative refractive index difference (Δ) was increased to 8.64%. We fabricated cascade S-shaped waveguides to estimate a bend loss of the proposed structure. Moreover, we applied those structures to arrayed-waveguide gratings (AWG)s. Both 8-channel, 100-GHz channel-spacing and 8-channel, 12.5-GHz channel-spacing AWGs were successfully fabricated. Compared with conventional AWGs, sizes of these devices were reduced by factors of about 2 and 4, respectively.

Original languageEnglish
Pages (from-to)786-790
Number of pages5
JournalJournal of Lightwave Technology
Volume27
Issue number6
DOIs
Publication statusPublished - 2009 Mar 15

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refractivity
silicon dioxide
waveguides
spacing
cascades
gratings
fabrication
radii
estimates

Keywords

  • Integrated optics
  • Optical planar waveguide
  • Waveguide bends

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

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AB - We have proposed the fabrication of small bend structures using trenches along both sides of the core, filled with low-refractive index material, in order to miniaturise silica planar lightwave circuits. The minimum bending radius of a silica waveguide was reduced from 2 mm to 200 μm by filling the trenches with low-refractive index material. The local lateral relative refractive index difference (Δ) was increased to 8.64%. We fabricated cascade S-shaped waveguides to estimate a bend loss of the proposed structure. Moreover, we applied those structures to arrayed-waveguide gratings (AWG)s. Both 8-channel, 100-GHz channel-spacing and 8-channel, 12.5-GHz channel-spacing AWGs were successfully fabricated. Compared with conventional AWGs, sizes of these devices were reduced by factors of about 2 and 4, respectively.

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