Title :
A New Remodulation Scheme for WDM-PONs With Enhanced Tolerance to Chromatic Dispersion and Remodulation Misalignment
Author :
Xu, Jing ; Chen, Lian-Kuan
Author_Institution :
Dept. of Inf. Eng., Chinese Univ. of Hong Kong, Hong Kong, China
fDate :
4/1/2010 12:00:00 AM
Abstract :
We investigate the use of differential phase-shift keying (DPSK) with a reduced modulation depth (RMD) as the downstream modulation format to enhance the tolerance to both chromatic dispersion and remodulation timing misalignment. Despite the RMD, in each optical network unit the demodulated DPSK signal from the destructive port of the delay-interferometer still maintains a high extinction ratio (ER), whereas the signal from the constructive port has a very low ER and can be readily remodulated by the upstream signal. Error-free operation at 10 Gb/s was achieved in a 20-km-reach experiment without dispersion compensation and remodulation synchronization.
Keywords :
differential phase shift keying; optical communication; passive networks; wavelength division multiplexing; WDM-PON; chromatic dispersion; differential phase-shift keying; downstream modulation; enhanced tolerance; error-free operation; high extinction ratio; passive optical network; reduced modulation depth; remodulation misalignment; Differential phase-shift keying (DPSK); modulation depth; wavelength-division-multiplexed passive optical network (WDM-PON);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2040988
