Demonstration of in-service wavelength division multiplexing optical-signal-to-noise ratio performance monitoring and operating guidelines for coherent data channels with different modulation formats and various baud rates

Mohammad Reza Chitgarha*, Salman Khaleghi, Wajih Daab, Ahmed Almaiman, Morteza Ziyadi, Amirhossein Mohajerin-Ariaei, Devora Rogawski, Moshe Tur, Joseph D. Touch, Vijay Vusirikala, Wendy Zhao, Alan E. Willner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrated a delay-line interferometer (DLI)-based, optical-signal-to-noise ratio (OSNR) monitoring scheme of 100 Gbit/s polarization multiplexed quadrature-phase-shift-keying (PM-QPSK) four-channel WDM at 50-GHz International Telecommunication Union (ITU) grid with <0.5 dB error for signals with up to 26 dB of actual OSNR. We also demonstrated data format transparency and baud rate tunability of the OSNR monitor by measuring the OSNR for a 200 Gbit/s PM-16-QAM (25-Gbaud) signal and a 200 Gbit/s PM-QPSK (50-Gbaud) signal. We also explored and studied different monitor parameters, including the shape of the filter spectrum, the bandwidth of the filter, DLI delay, and DLI phase-detuning to determine the design guidelines for a desired level of accuracy for the OSNR monitor in an optical network.

Original languageEnglish
Pages (from-to)1605-1608
Number of pages4
JournalOptics Letters
Volume39
Issue number6
DOIs
StatePublished - 15 Mar 2014

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