Adaptive Gain, Equalization, and Wavelength Stabilization Techniques for Silicon Photonic Microring Resonator-Based Optical Receivers Conference Paper uri icon


  • 2016 SPIE. Interconnect architectures based on high-Q silicon photonic microring resonator devices offer a promising solution to address the dramatic increase in datacenter I/O bandwidth demands due to their ability to realize wavelength-division multiplexing (WDM) in a compact and energy efficient manner. However, challenges exist in realizing efficient receivers for these systems due to varying per-channel link budgets, sensitivity requirements, and ring resonance wavelength shifts. This paper reports on adaptive optical receiver design techniques which address these issues and have been demonstrated in two hybrid-integrated prototypes based on microring drop filters and waveguide photodetectors implemented in a 130nm SOI process and high-speed optical front-ends designed in 65nm CMOS. A 10Gb/s powerscalable architecture employs supply voltage scaling of a three inverter-stage transimpedance amplifier (TIA) that is adapted with an eye-monitor control loop to yield the necessary sensitivity for a given channel. As reduction of TIA input-referred noise is more critical at higher data rates, a 25Gb/s design utilizes a large input-stage feedback resistor TIA cascaded with a continuous-time linear equalizer (CTLE) that compensates for the increased input pole. When tested with a waveguide Ge PD with 0.45A/W responsivity, this topology achieves 25Gb/s operation with -8.2dBm sensitivity at a BER=10-12. In order to address microring drop filters sensitivity to fabrication tolerances and thermal variations, efficient wavelength-stabilization control loops are necessary. A peak-power-based monitoring loop which locks the drop filter to the input wavelength, while achieving compatibility with the high-speed TIA offset-correction feedback loop is implemented with a 0.7nm tuning range at 43W/GHz efficiency.

name of conference

  • Next-Generation Optical Networks for Data Centers and Short-Reach Links III

published proceedings


author list (cited authors)

  • Palermo, S., Chiang, P., Yu, K., Bai, R., Li, C., Chen, C., ... Titriku, A.

citation count

  • 0

complete list of authors

  • Palermo, Samuel||Chiang, Patrick||Yu, Kunzhi||Bai, Rui||Li, Cheng||Chen, Chin-Hui||Fiorentino, Marco||Beausoleil, Ray||Li, Hao||Shafik, Ayman||Titriku, Alex

editor list (cited editors)

  • Srivastava, A. K.

publication date

  • January 2016