Chitgarha Mohammad Reza, Khaleghi Salman, Daab Wajih, Almaiman Ahmed, Ziyadi Morteza, Mohajerin-Ariaei Amirhossein, Rogawski Devora, Tur Moshe, Touch Joseph D, Vusirikala Vijay, Zhao Wendy, Willner Alan E
Opt Lett. 2014 Mar 15;39(6):1605-8. doi: 10.1364/OL.39.001605.
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.
我们展示了一种基于延迟线干涉仪（DLI）的光信噪比（OSNR）监测方案，用于在50 GHz国际电信联盟（ITU）网格上对100 Gbit/s偏振复用正交相移键控（PM-QPSK）四通道波分复用（WDM）进行监测，对于实际OSNR高达26 dB的信号，误差<0.5 dB。我们还通过测量200 Gbit/s PM-16-QAM（25 GBaud）信号和200 Gbit/s PM-QPSK（50 GBaud）信号的OSNR，展示了该OSNR监测器的数据格式透明性和波特率可调性。我们还探索和研究了不同的监测参数，包括滤波器频谱形状、滤波器带宽、DLI延迟和DLI相位失谐，以确定光网络中OSNR监测器达到所需精度水平的设计准则。
