Differential phase-shift-keying demodulation by coherent perfect absorption in silicon photonics Journal Articles uri icon

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  • We demonstrate a novel differential phase-shift-keying (DPSK) demodulator based on coherent perfect absorption (CPA). Our DPSK demodulator chip device, which incorporates a silicon ring resonator, two bus waveguide inputs, and monolithically integrated detectors, operates passively at a bit rate of 10 Gbps at telecommunication wavelengths, and fits within a mm-scale footprint. Critical coupling is used to achieve efficient CPA by tuning the gap between the ring and bus waveguides. The device has a vertical eye opening of 12.47 mV and a quality factor exceeding 3×104. The fundamental principle behind this photonic circuit can be extended to other formats of integrated demodulators.


  • Ahmed, Asif
  • Yang, Hao
  • Rothenberg, Jacob M
  • Souhan, Brian
  • Wang, Zhao
  • Abrams, Nathan C
  • Meng, Xiang
  • Ingold, Kirk A
  • Evans, Christopher C
  • Hensley, Joel M
  • Bergman, Keren
  • Grote, Richard R
  • Knights, Andrew
  • Dadap, Jerry I
  • Osgood, Richard M

publication date

  • August 15, 2018