OSNR monitoring in the presence of first-order PMD using polarization diversity and DSP

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15 Citations (Scopus)


We analytically study optical signal-to-noise ratio (OSNR) monitoring using polarization diversity and digital signal processing (DSP) in the presence of first-order polarization-mode dispersion (PMD). We derived conditions on the input signal polarization, principle states of polarization (PSP) and differential group delay (DGD) of the fiber, polarization beam splitter (PBS) axes and receiver electrical low-pass filter bandwidth such that the monitored OSNR is least affected by PMD and we propose the use of a polarization scrambler (PS) before the PBS to achieve such conditions in practice. In addition, two special polarization states for which the proposed technique can operate independent of first-order PMD are identified. The theoretical predictions are verified through simulations. The analytical insights developed represent a more general and unified framework of which various OSNR monitoring techniques based on polarization diversity proposed in the literature can be understood as special cases.
Original languageEnglish
Article number5484570
Pages (from-to)2105-2114
Number of pages10
JournalJournal of Lightwave Technology
Issue number15
Publication statusPublished - 29 Jul 2010


  • Digital signal processors
  • monitoring
  • optical fiber polarization
  • optical noise

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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