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In-band OSNR measurement for CO-OFDM systems using high-resolution spectral analysis is experimentally demonstrated. It is shown that signal and noise levels can be monitored by direct optical spectrum analysis, avoiding the need for data demodulation.
We propose an optical signal-to-noise ratio (OSNR) estimation method for direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) systems by calculating the electrical SNR of one pilot subcarrier based on correlation. Simulation and experiment are conducted to verify this OSNR estimation method in a 15-Gb/s DDO-OFDM system. The maximum OSNR estimation error is 0.8 dB within an...
We propose a novel approach for transparent and in-service OSNR system margin monitoring for coherent optical modulation formats. This technique is demonstrated experimentally for a 120.6 Gb/s DP-QPSK channel in both dispersion and non-dispersion managed links.
In-band OSNR measurement for IM/DD O-OFDM systems using high-resolution spectral analysis is experimentally demonstrated. It is shown that noise level can be monitored by direct optical spectrum analysis using no polarization analysis or coherence properties and avoiding the need for data demodulation.
A novel OSNR monitoring technique based on use of optical pulse correlation is demonstrated experimentally. By measuring statistics extracted from the autocorrelation peak, the OSNR is estimated with an error of less than 0.5 dB.
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