Energy-Efficient VCSEL Array Using Power and Offset Allocation of Spatial Multiplexing in Graded-Index Multimode Fiber

Nir Sheffi, Dan Sadot

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

In recent years, we exhibit an exponential data traffic and electrical power consumption growth in high-performance computing (HPC) interconnects. Thus, Green Photonics, which tries to minimize the Joule/bit ratio, becomes a major subject of both public and scientific interest. A significant amount of the installations within these HPCs are graded-index multimode fibers using parallel rack-to-rack optical interconnects. These fibers enable the use of mode division multiplexing to increase the fiber's capacity. In this paper, we theoretically derive a power and offset allocation method for an intensity modulated optical multiple-input-multiple-output system with incoherent single-mode vertical cavity surface emitting laser array, which minimizes the electrical power consumption for a required bit rate and allowed bit error rate. This method outperforms simple equal bit and power allocation scheme, achieving a 45-55% electrical power save with a typicalrequired bit error rate of 10-6.

Original languageEnglish
Article number7827998
Pages (from-to)2098-2108
Number of pages11
JournalJournal of Lightwave Technology
Volume35
Issue number11
DOIs
StatePublished - 1 Jun 2017

Keywords

  • Data-centers
  • graded-index multimode fiber (GI-MMF)
  • high performance computing (HPC)
  • mode division multiplexing (MDM)
  • multiple-input-multiple-output (MIMO)
  • vertical-cavity-surface-emitting lasers (VCSELs)

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