Eight-Channel Silicon-Photonic Wavelength Division Multiplexer with 17 GHz Spacing

Dvir Munk, Moshe Katzman, Yuri Kaganovskii, Naor Inbar, Arijit Misra, Mirit Hen, Maayan Priel, Moshe Feldberg, Maria Tkachev, Arik Bergman, Menachem Vofsi, Michael Rosenbluh, Thomas Schneider, Avi Zadok

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Dense wavelength division multiplexers are key components of data communication networks. This paper presents a silicon-photonic eight-channel multiplexer device with a channel spacing of only 0.133 nm (17 GHz). Devices were fabricated in a commercial silicon foundry, in 8» silicon-on-insulator wafers. The device layout consists of seven unbalanced Mach-Zehnder interferometers in a cascaded tree topology, and each interferometer unit also includes a nested ring resonator element. The transfer function of each unit is that of a maximally flat, auto-regressive, moving-average filter. The devices are characterized by uniform passbands, sharp spectral transitions between pass and stop bands, and strong out-of-band rejection. The worst-case optical power crosstalk is -22 dB. The proper function of the device requires careful control of optical phase delays over 14 distinct optical paths. Post-fabrication trimming of phase delays was performed through local illumination of a photo-sensitive upper cladding layer of chalcogenide glass. The de-multiplexing of three adjacent QAM-16, 40 Gbit/s wavelength-division channels was successfully demonstrated. The devices are applicable in data communication and in integrated-photonic processing of radio-over-fiber waveforms.

Original languageEnglish
Article number8664601
JournalIEEE Journal of Selected Topics in Quantum Electronics
Volume25
Issue number5
DOIs
StatePublished - 1 Sep 2019

Bibliographical note

Publisher Copyright:
© 1995-2012 IEEE.

Keywords

  • Silicon photonics
  • chalcogenide glasses
  • data communication
  • optical communication
  • optical filters
  • photonic integrated circuits
  • wavelength division multiplexing

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