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OFDM system implementation using compatible SSB modulation with a dual-electrode MZM.

Zhenbo Xu1, Maurice O'Sullivan, Rongqing Hui

  • 1Information and Telecommunication Technology Center, The University of Kansas, Lawrence, Kansas 66045, USA. zhenbo@ittc.ku.edu

Optics Letters
|April 23, 2010
PubMed
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This study demonstrates single-sideband (SSB) optical orthogonal frequency division multiplexing (OFDM) transmission over 125 km without a guard band. The method uses a dual-electrode Mach-Zehnder modulator for efficient SSB modulation.

Area of Science:

  • Optical communications
  • Signal processing
  • Photonics

Background:

  • Traditional optical OFDM systems often require guard bands, increasing spectral inefficiency.
  • Single-sideband (SSB) modulation can improve spectral efficiency by reducing bandwidth requirements.
  • Direct-detection receivers simplify system architecture but can be sensitive to spectral characteristics.

Purpose of the Study:

  • To experimentally demonstrate single-sideband (SSB) direct-detection optical orthogonal frequency division multiplexing (OFDM) transmission.
  • To investigate the feasibility of eliminating guard bands between the carrier and OFDM spectrum.
  • To analyze the impact of modulation indices on system performance.

Main Methods:

  • Analytical derivation of compatible SSB modulation waveforms.

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  • Implementation of SSB modulation using a single dual-electrode Mach-Zehnder modulator.
  • Experimental setup for 125 km fiber transmission of SSB-OFDM signals.

    • Main Results:

    • Successful experimental demonstration of SSB-OFDM transmission over 125 km fiber.
    • Elimination of the need for a guard band between the carrier and the OFDM spectrum.
    • Analysis of required optical signal-to-noise ratios (OSNR) for various modulation indices.

    Conclusions:

    • SSB-OFDM is a viable technique for spectrally efficient optical communication.
    • The proposed modulation scheme enables guard-band-free transmission, enhancing spectral utilization.
    • Understanding OSNR requirements is crucial for optimizing SSB-OFDM system performance.