Quantitative analysis of a flat-top planar waveguide demultiplexer

Chun-Ting Lin*, Yang Tung Huang, Jung Y. Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


A three-focal-point method is used for the design of a flat-top planar waveguide concave grating. With the Gaussian approximation a modified formula is proposed and is compared with the numerical model of the scalar diffraction theory by using a design example. The sources of loss caused by the flat-top design and the grating are taken into consideration. The optimal separation between the two outmost focal points is obtained and the spectral response of the demultiplexer with a ripple below 0.04 dB is achieved.

Original languageEnglish
Pages (from-to)552-558
Number of pages7
JournalJournal of Lightwave Technology
Issue number5
StatePublished - 1 Mar 2009


  • Concave grating
  • Flat-top
  • Planar waveguide
  • Three-focal-point method
  • Wavelength-division multiplexing

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