Short-length and broadband mismatched optical couplers with tapered Hamming function for C- and L-band

Yun Sheng Ku, Chi Feng Chen, Chang Neng Shauo, Hsiou Jeng Shy

Research output: Contribution to journalArticlepeer-review

Abstract

Mismatched optical couplers with variable widths of waveguide tapered by Hamming function are numerically investigated in the demand of short-length, broadband, and low crosstalk. We used global search algorithm and beam propagation method to seek optimal structure parameters of coupling waveguide. The coupler length is 3.6 mm within the C+L-band (1.53-1.61 μm) for variable widths of waveguide at crosstalk level of -35 dB. Comparison with constant width of waveguide, the constant width of waveguide has a coupler length of 4.4 mm and can only achieve -20 dB of crosstalk within the C-band (1.53-1.565 μm). Obviously, the waveguide with variable widths has the advantage over constant width for the demand of short-length, bandwidth, and low-crosstalk.

Original languageEnglish
Pages (from-to)831-838
Number of pages8
JournalOptik
Volume121
Issue number9
DOIs
StatePublished - May 2010

Keywords

  • Adiabatic directional coupler
  • Coupling waveguide structure
  • Hamming function
  • Mismatched optical coupler
  • Optical coupler

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