Integrated multichannel OADM's using polymer bragg grating MZI's

Louay Eldada, Shing Yin, Constantina Poga, Cathy Glass, Robert Blomquist, Robert A. Norwood

Research output: Contribution to journalArticlepeer-review

74 Scopus citations


We report the first fabrication of Bragg-grating-based multichannel optical add/drop multiplexers (OADM's) in planar polymers. The filters were designed by cascading multiple stages of single-channel multi-/demultiplexers. Each stage consists of a Mach-Zehnder interferometer (MZI) with a Bragg grating across its arms. The 3-dB couplers in each MZI are multimode interference (MMI) couplers. We fabricated the first tapered MMI couplers, which provide compactness. The gratings were printed photochemically, achieving index differences as high as 10 -3 and reflectivities as large as 33 dB. The 3-dB bandwidth is about 0.2 nm. Apodization was used to reduce sidelobes in the reflection spectrum. Four-channel OADM's were produced and exhibited the proper 400-GHz channel separation and ITU grid wavelength alignment, as well as excellent channel isolation and uniform channel response.

Original languageEnglish (US)
Pages (from-to)1416-1418
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number10
StatePublished - Oct 1998


  • DWDM
  • Gratings
  • MMI
  • OADM
  • Polymers

ASJC Scopus subject areas

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


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