Title :
PMD-insensitive OSNR monitoring based on polarization-nulling with off-center narrow-band filtering
Author :
Cheung, Man-Hong ; Chen, Lian-Kuan ; Chan, Chun-Kit
Author_Institution :
Dept. of Inf. Eng., Chinese Univ. of Hong Kong, China
Abstract :
We propose and experimentally demonstrate the use of polarization-nulling with off-center narrow-band filtering to realize a new polarization-mode dispersion (PMD)-insensitive in-band optical signal-to-noise ratio monitoring scheme. When applied to a 39.81-Gb/s 2.5-ps full-width at half-maximum return-to-zero on-off keyed optical time-division-multiplexing system with 10and 20-ps differential group delay, the monitoring errors were reduced from >20 dB to <0.9 and <1.6 dB, respectively, hence demonstrating the feasibility of this scheme even under severe PMD degradation. This technique is simple and can be easily upgraded for use in higher data-rate optical systems.
Keywords :
amplitude shift keying; errors; monitoring; optical fibre communication; optical fibre dispersion; optical fibre polarisation; optical filters; optical modulation; optical noise; time division multiplexing; 10 ps; 2.5 ps; 20 ps; 39.81 Gbit/s; OSNR monitoring; PMD; differential group delay; monitoring errors; off-center narrow-band filtering; optical signal-to-noise ratio; polarization mode dispersion; polarization-nulling; return-to-zero on-off keying; time-division multiplexing; Degradation; Delay; Filtering; Monitoring; Narrowband; Optical filters; Optical noise; Optical polarization; Polarization mode dispersion; Signal to noise ratio;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.834916