Athermal echelle grating and tunable echelle grating demultiplexers using a Mach-Zehnder interferometer launch structure Journal Articles uri icon

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  • We present a comparative experimental study of three silicon photonic echelle grating demultiplexers that are integrated with a Mach-Zehnder interferometer (MZI) launch structure. By appropriate choice of the MZI configuration, the temperature induced shift of the demultiplexer channel wavelengths can be suppressed (athermal) or enhanced (super-thermal) or be controlled by an on-chip micro-heater. The latter two configurations allow the channel wavelengths to be actively tuned using lower power than possible by temperature tuning a conventional echelle demultiplexer. In the athermal configuration, the measured channel spectral shift is reduced to less than 10 pm/°C, compared to the 83 pm/°C shift for an unmodified echelle device. In super-thermal operation an enhanced channel temperature tuning rate of 170 pm/°C is achieved. Finally, by modulating the MZI phase with an on-chip heater, the demultiplexer channels can be actively tuned to correct for ambient temperature fluctuations up to 20 °C, using a drive current of less than 20 mA.


  • Melati, Daniele
  • Xu, Dan-Xia
  • Cheriton, Ross
  • Wang, Shurui
  • Vachon, Martin
  • Schmid, Jens H
  • Cheben, Pavel
  • Janz, Siegfried

publication date

  • April 25, 2022