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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 8,
  • Issue 9,
  • pp. 819-822
  • (2010)

Heterodyne direct-detection OOFDM system with low sampling rate

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Abstract

A method of multi-channel receiving for high bit rate heterodyne direct-detection optical orthogonal frequency-division-multiplexing (OOFDM) system is proposed to reduce the sampling rate demand of analog-to-digital converter (ADC). The sampling rate of ADCs can be reduced to 1/N that of the original signal bandwidth in an N-channel receiving system. Aided by a succeeding digital signal processing (DSP) at the receiver, aliasing free signal can be recovered. A back-to-back experimental result is given for a 4-channel system, based on which, a down conversion process for heterodyne can be reduced. The signal rebuilding algorithm is given and analyzed in its complexity and noise tolerance.

© 2010 Chinese Optics Letters

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