Integrated resonance-enhanced variable optical delay lines

Mahmoud S. Rasras, Christi K. Madsen, Mark A. Cappuzzo, Evans Chen, Lou T. Gomez, Edward J. Laskowski, Andrew Griffin, Annjoe Wong-Foy, Arman Gasparyan, Albin Kasper, Jane Le Grange, Sanjay S. Patel

Research output: Contribution to journalArticlepeer-review


A wide-tuning-range optical delay line is demonstrated in high (2%) index contrast waveguides. This device integrates four-stage ring resonator all-pass filters (APFs) with cascaded fixed spiral-type delay waveguides; each fixed delay path varies in length by a factor of two from the previous stage. A 2 × 2 switch separates each fixed delay and the tunable parts of the delay line. The APF allows for continuous delay tuning. This device enables coherent switching and continuous tuning ranges up to 2.56 ns.

Original languageEnglish (US)
Pages (from-to)834-836
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number4
StatePublished - Apr 2005


  • All-pass filters (APFs)
  • Group delay
  • Optical delay lines
  • Optical waveguides

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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