Performance Optimization of High Speed DACs Using DSP

Yaron Yoffe, Eyal Wohlgemuth, Dan Sadot

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

DSP techniques that enhance the effective resolution of digital-To-Analog converters (DACs) are presented. First, DACs that are limited by physical number of bits (PNOB) are addressed. An improved digital-resolution-enhancer (DRE) algorithm, which incorporates an optimized non-uniform quantization scheme is analytically analyzed and experimentally demonstrated. Improvement of up to 8 dB is shown, that enables 16QAM and 64QAM transmission using only 2 and 3 bits DACs, respectively. Furthermore, the DRE concept is elaborated to include additional practical DAC impairments such as timing jitter. Based on a generalized DAC model, we suggest an improved algorithm that increases the tolerance to jitter noise, termed as jitter-Aware DRE (JA-DRE). The method is validated in numerical simulations, indicating substantial OSNR gain of $\sim \!5$ dB over non DSP enhanced DACs, and up to 2 dB over the previously proposed DRE algorithm. copy; 1983-2012 IEEE.

Original languageEnglish
Article number9075389
Pages (from-to)3096-3105
Number of pages10
JournalJournal of Lightwave Technology
Volume38
Issue number12
DOIs
StatePublished - 15 Jun 2020

Keywords

  • Optical fiber communication
  • digital precompensation
  • digital signal processing
  • digital-Analog conversion
  • quantization
  • timing jitter

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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