Low-Resolution Digital Pre-Compensation Enabled by Digital Resolution Enhancer

Yaron Yoffe, Ginni Khanna, Eyal Wohlgemuth, Erik De Man, Bernhard Spinnler, Norbert Hanik, Antonio Napoli, Dan Sadot

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Digital pre-compensation (DPC) is an indispensable block of state-of-the-art optical transceivers, and a key enabler for high-order modulation formats (HOMFs) transmission. A crucial component, which enables the transmission of the precompensated HOMFs, is the digital-to-analog-converter (DAC). However, as data and symbol rates grow, the implementation of such devices becomes highly challenging in terms of performance, power consumption, and costs. In this paper, a digital-resolution-enhancer (DRE) algorithm is discussed, conjoined with high-end DPC methods. Simulation results demonstrate that the DRE reduces the effect of DAC quantization noise power by more than 8 dB for the considered cases of 400G with 64QAM. The proposed scheme is experimentally verified by transmitting a 4-bit DP-64QAM 400 Gbit/s signal in a WDM scenario over 95 km of single mode fiber.

Original languageEnglish
Article number8565950
Pages (from-to)1543-1551
Number of pages9
JournalJournal of Lightwave Technology
Volume37
Issue number6
DOIs
StatePublished - 15 Mar 2019

Keywords

  • Digital pre-compensation
  • coherent detection
  • digital signal procressing
  • digital-to-analog conversion
  • high-order modulation formats
  • quantization
  • resolution enhancement

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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