• DocumentCode
    778122
  • Title

    Robustness to laser frequency offset in direct-detection DPSK and DQPSK systems

  • Author

    Kim, Hoon ; Winzer, Peter J.

  • Author_Institution
    Lucent Technol., Bell Labs., Holmdel, NJ, USA
  • Volume
    21
  • Issue
    9
  • fYear
    2003
  • Firstpage
    1887
  • Lastpage
    1891
  • Abstract
    We assess, both by measurement and simulation, the receiver performance degradation caused by frequency offsets between the optical source and the delay interferometer for nonreturn-to-zero (NRZ) and return-to-zero (RZ) differential-phase-shift-keying (DPSK) and differential-quadrature-phase-shift-keying (DQPSK) systems. We find that NRZ- and RZ-DQPSK systems are about six times more sensitive to frequency offsets than NRZ- and RZ-DPSK systems operating at the same bit rate. We explain the reason for this behavior by means of eye aperture considerations.
  • Keywords
    differential phase shift keying; distributed feedback lasers; light interferometers; optical fibre communication; DQPSK systems; bit rate; delay interferometers; direct-detection DPSK; eye aperture considerations; frequency offsets; laser frequency offset; performance degradation; return-to-zero differential-phase-shift-keying; Bit rate; Degradation; Delay; Differential quadrature phase shift keying; Frequency measurement; Optical interferometry; Optical receivers; Optical sensors; Optical signal processing; Robustness;
  • fLanguage
    English
  • Journal_Title
    Lightwave Technology, Journal of
  • Publisher
    ieee
  • ISSN
    0733-8724
  • Type

    jour

  • DOI
    10.1109/JLT.2003.816816
  • Filename
    1230167