Mitigating the Energy Impacts of VBTI Aging in Photonic Networks-on-Chip Architectures with Multilevel Signaling

Ishan G. Thakkar, Sudeep Pasricha

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Photonic networks-on-chip (PNoCs) can enable higher bandwidth and lower latency data transfers at the speed of light. Such PNoCs consist of photonic waveguides with dense-wavelength-division-multiplexing (DWDM) for signal traversal and microring resonators (MRS) for signal modulation and reception. To enable MRS to modulate and receive DWDM photonic signals, change in the free-carrier concentration in or operating temperature of MRS through their voltage biasing is essential. But long-term operation of MRS with constant or time-varying temperature and voltage biasing causes aging. Such voltage bias and temperature induced (VBTI) aging in MRS leads to resonance wavelength drifts and Q-factor degradation at the device-level, which in turn exacerbates three key spectral effects at the photonic link level, namely the intermodulation crosstalk, heterodyne crosstalk, and signal sidelobes truncation. These adverse spectral effects ultimately increase signal power attenuation and energy-per-bit in PNoCs. Our frequency-domain analysis of photonic links shows that the use of the four pulse amplitude modulation (4-PAM) signaling instead of the traditional on-off keying (OOK) signaling can proactively reduce signal attenuation caused by the VBTI aging induced spectral effects. Our system-level evaluation results indicate that, compared to OOK based PNoCs with no aging, 4-PAM based PNoCs can achieve 5.5% better energy-efficiency even after undergoing VBTI aging for 3 Years.

Original languageEnglish
Title of host publication2018 9th International Green and Sustainable Computing Conference, IGSC 2018
ISBN (Electronic)9781538674666
DOIs
StatePublished - Oct 2018
Event9th International Green and Sustainable Computing Conference, IGSC 2018 - Pittsburgh, United States
Duration: Oct 22 2018Oct 24 2018

Publication series

Name2018 9th International Green and Sustainable Computing Conference, IGSC 2018

Conference

Conference9th International Green and Sustainable Computing Conference, IGSC 2018
Country/TerritoryUnited States
CityPittsburgh
Period10/22/1810/24/18

Bibliographical note

Funding Information:
This research is supported by grants from the College of Engineering, University of Kentucky and NSF (CCF-1813370).

Publisher Copyright:
© 2018 IEEE.

Keywords

  • aging
  • crosstalk
  • frequency domain
  • photonic networks-on-chip
  • resonance passband

ASJC Scopus subject areas

  • Hardware and Architecture
  • Renewable Energy, Sustainability and the Environment
  • Computer Networks and Communications

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