Energy-efficient hybrid coded modulations enabling terabit optical ethernet

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Future Internet technologies will be affected not only by limited bandwidth of information infrastructure, but also by its energy consumption. In order to solve both problems simultaneously, in this invited paper, we describe several energy-efficient (EE) hybrid coded-modulation (CM) schemes enabling Terabit optical Ethernet: EE 4D CM, EE generalized- OFDM, and EE spatial-domain-based CM. A common property of these is employment of EE modulations, various degrees of freedom and rate-adaptive coding. These EE schemes are called hybrid as all available degrees of freedom are used for transmission over optical fibers including amplitude, phase, polarization and OAM. Since the channel capacity is a linear function in number of dimensions, by increasing the number of basis functions, we can dramatically improve overall capacity. The EE problem is solved by properly designing multi-dimensional signal constellations such that transinformation is maximized, while taking the energy constraint into account.

Original languageEnglish (US)
Title of host publicationOptical Metro Networks and Short-Haul Systems IV
StatePublished - 2012
EventOptical Metro Networks and Short-Haul Systems IV - San Francisco, CA, United States
Duration: Jan 24 2012Jan 26 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherOptical Metro Networks and Short-Haul Systems IV
Country/TerritoryUnited States
CitySan Francisco, CA


  • Coded modulation
  • Forward error correction
  • Hybrid modulations
  • Low-density parity-check (LDPC) codes
  • Optical communications
  • Optimum signal constellations
  • Orbital angular momentum (OAM)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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