180-degree-bend structures using light reflection at double elliptic mirror in slab waveguide

Mariko Ishida, Yuichiro Ikuma, Takanori Suzuki, Hiroyuki Tsuda

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We have proposed a small 180°-bend structure employing a double elliptic mirror where the light changes its propagating direction by reflecting at the two mirrors. There are three other types of bend structure: (1) a Ag mirror bend structure, (2) a total internal reflection (TIR) mirror bend structure, and (3) a TIR mirror bend structure employing tapered waveguides. In the Ag mirror bend structure, Ag functions as the mirror, while in a TIR mirror bend structure, an air gap functions as the mirror. The size of the proposed structure is considerably smaller than that of a conventional bend waveguide; additionally, a large tolerance to mirror position misalignment and a low wavelength-dependent loss (WDL) can be attained. The insertion losses at 1550 nm are 4.28 dB for an Ag mirror bend structure, 8.69 dB for a TIR mirror bend structure, and 4.78 dB for a TIR mirror bend structure with tapered waveguides. Further loss reduction is expected by taking into consideration the phase shift due to reflection.

Original languageEnglish
Pages (from-to)168-174
Number of pages7
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number1
Publication statusPublished - 2007 Jan 10


  • Bends
  • Directional change
  • Elliptic mirror
  • Optical waveguide
  • Silica

ASJC Scopus subject areas

  • General Engineering
  • General Physics and Astronomy


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