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7 March 2016 Adaptive gain, equalization, and wavelength stabilization techniques for silicon photonic microring resonator-based optical receivers
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Abstract
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 43μW/GHz efficiency.
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Samuel Palermo, Patrick Chiang, Kunzhi Yu, Rui Bai, Cheng Li, Chin-Hui Chen, Marco Fiorentino, Ray Beausoleil, Hao Li, Ayman Shafik, Binhao Wang, and Alex Titriku "Adaptive gain, equalization, and wavelength stabilization techniques for silicon photonic microring resonator-based optical receivers", Proc. SPIE 9775, Next-Generation Optical Networks for Data Centers and Short-Reach Links III, 97750K (7 March 2016); https://doi.org/10.1117/12.2214888
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