Optimal design of coupling waveguide structure for adiabatic optical directional full couplers weighted by sin-square and raised-cosine functions

Chi Feng Chen, Yun Sheng Ku, Tsu Te Kung

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The optimal design of coupling waveguide structure for adiabatic optical directional full couplers (AODFC) based on weighted sin-square function (SSF) and raised-cosine function (RCF) are investigated in this paper. The coupling lengths with a crosstalk smaller than -30 dB at the operating wavelength of 1.57 μm resulted in a value of 3.0 and 2.4 mm for the SSF and RCF cases, respectively. Under the same level of crosstalk, the wavelength ranges obtained by weighted SSF and RCF could be varied about 1.33-1.70 μm and 1.27-1.70 μm with coupler lengths of 6.0 and 5.5 mm, respectively. Clearly, the AODFC weighted by RCF has the superior performances of both short coupling length and broad wavelength ranges.

Original languageEnglish
Pages (from-to)79-86
Number of pages8
JournalOptics Communications
Volume280
Issue number1
DOIs
StatePublished - 1 Dec 2007

Keywords

  • Adiabatic directional coupler
  • Adiabatic optical directional full coupler
  • Coupling waveguide structure
  • Optical directional coupler
  • Raised-cosine function
  • Sin-square function

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