Differential phase-shift-keying demodulation by coherent perfect absorption in silicon photonics
The Optical Society
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.
Detectors, Optical filters, Optical systems, Phase shift, Ring resonators, Silicon photonics
Asif Ahmed, Hao Yang, Jacob M. Rothenberg, Brian Souhan, Zhao Wang, Nathan C. Abrams, Xiang Meng, Kirk A. Ingold, Christopher C. Evans, Joel M. Hensley, Keren Bergman, Richard R. Grote, Andrew P. Knights, Jerry I. Dadap, and Richard M. Osgood, "Differential phase-shift-keying demodulation by coherent perfect absorption in silicon photonics," Opt. Lett. 43, 4061-4064 (2018)