In-line residual chromatic dispersion measurement for NRZ-DPSK and RZ-DPSK signals using a novel RF spectrum phase detection technique

摘要

In this paper, a novel method of in-line chromatic dispersion (CD) measurement is proposed, we theoretically and experimentally demonstrated the CD measurement of 40-Gbit/s NRZ-DPSK and RZ-DPSK signals by a novel RF spectrum phase detection technique, this is performed using in-band tone monitoring RF, electrically down-converted to direct current (DC) or a low intermediate- frequency (IF) of less than 1 MHz through electronic mixing with local oscillator (LO) of 5 GHz. The measurement provides CD measuring range (±425 psm), and independent of the bit-rate and data format. In addition, the use of electronic mixer and low-speed detectors makes it cost effective for in-line CD measurement.