Title :
A DPSK Receiver With Enhanced CD Tolerance Through Optimized Demodulation and MLSE
Author :
Alfiad, Mohammad ; van den Borne, Dirk ; Napoli, Antonio ; Koonen, A.M.J. ; De Waardt, Huug
Author_Institution :
Eindhoven Univ. of Technol., Eindhoven
fDate :
5/15/2008 12:00:00 AM
Abstract :
We experimentally demonstrate that a differential phase-shift keying (DPSK) receiver employing a Mach-Zehnder delay interferometer (MZDI) with a bit delay of less than one bit combined with maximum likelihood sequence estimation can considerably enhance the tolerance to chromatic dispersion (CD). Furthermore, we analyze the impact of sampling phase and optimize the MZDI bit delay for 10.7-Gb/s nonreturn-to-zero (NRZ)-DPSK demodulation. Our investigation shows that a 4000-ps/nm CD tolerance at 2-dB penalty is feasible for 10.7-Gb/s NRZ-DPSK.
Keywords :
Mach-Zehnder interferometers; delays; demodulation; differential phase shift keying; maximum likelihood sequence estimation; optical fibre communication; optical fibre dispersion; optical receivers; DPSK receiver; Mach-Zehnder delay interferometer; bit delay; bit rate 10.7 Gbit/s; chromatic dispersion tolerance; differential phase-shift keying; maximum likelihood sequence estimation; nonreturn-to-zero-DPSK demodulation; optimized demodulation; sampling phase; Delay estimation; Demodulation; Differential quadrature phase shift keying; Maximum likelihood estimation; Optical attenuators; Optical interferometry; Optical modulation; Optical noise; Optical receivers; Signal to noise ratio; Chromatic dispersion (CD); Mach–Zehnder delay interferometer (MZDI); differential phase-shift keying (DPSK); maximum likelihood sequence estimation (MLSE);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2008.921825
