Slot-waveguide-assisted temperature-independent mach-zehnder interferometer based optical filter

Huamao Huang*, Seng Tiong Ho, Dexiu Huang, Yongming Tu, Haiying Hu, Jiafu Wang, Wen Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


A new design of temperature-independent Mach-Zehnder interferometer (MZI) based optical filter involving a combined use of silicon (Si) wire waveguides and slot waveguides is presented. The ratio of the path-length difference for the two types of waveguides is introduced to tune the thermal performance of the filtering wavelength. This ratio and its derived parameters render a high-level of flexibility for optimizing the design of interferometers based on optical path-length difference. By adjusting the path-length difference ratio for Si-wire waveguides and slot waveguides in the asymmetric arms of the MZI, an ideal temperature-independent optical filter can be obtained, while the modified interference order is enhanced. The proposed method is verified via a two-dimensional finite difference time domain simulation.

Original languageEnglish (US)
Pages (from-to)545-551
Number of pages7
JournalJournal of Modern Optics
Issue number7
StatePublished - Apr 2010


  • Mach-Zehnder interferometer
  • Optical filter
  • Silicon wire
  • Slot waveguide
  • Temperature-independent

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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