Chromatic-dispersion monitoring using an optical delay-and-add filter

Experimental Demonstration of Resolution-Enhanced Residual Chromatic-Dispersion Monitoring Using Half-bit Delay-interferometer Filtering for RZ-OOK Systems

“…However, the dispersion resolution is relatively poor, especially in the low dispersion range. It is not suitable for the adaptive post-compensation system, where the dispersion is monitored after tunable dispersion compensator, and the measured residual dispersion varies in low dispersion range [5].…”