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

doi:10.1364/OL.39.001605

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

Opt Lett. 2014 Mar 15;39(6):1605-8. doi: 10.1364/OL.39.001605.

Authors

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

PMID: 24690849
DOI: 10.1364/OL.39.001605

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.