Measuring Optical Signal-to-Noise-Ratio (OSNR) in live Dense
Wavelength Division Multiplexing (DWDM) systems using polarization

multiplexed transmission (Pol-Mux) is an unsolved challenge. The

VIAVI Pol-Mux OSCA-710 is the first instrument to use a novel

spectral correlation technique (SCorM, VIAVI patent) to enable the

measurement of in-band OSNR, and per channel chromatic dispersion

of 40 Gb/s, 100 Gb/s, 200 Gb/s and 400 Gb/s coherent transmission

signals utilizing Pol-Mux in a live system, without shutting down the

network or individual channels.


  • Industry’s first OSCA that measures
    in-band OSNR on Pol-Mux signals
  • First instrument that measures
    per channel CD
  • Characterize traffic without
    shutting down the network or

    individual channels
  • Supports PM-BPSK, PM-QPSK, and
    PM-xQAM modulation formats
  • Tolerant of ROADM filtering and
    of high CD and PMD
  • Ultra-high resolution, coherent
    OSCA for testing Nyquist- and

  • WDM-Expert software for auto-
    identification of symbol-rate in

    mixed traffic pipes
  • Core and metro DWDM networks
    with or without ROADMs
  • Undersea communication links
  • Qualification of any fiber optic link
    utilizing coherent detection