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

Volume

20

Issue

10

fYear

2008

fDate

5/15/2008 12:00:00 AM

Firstpage

818

Lastpage

820

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);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2008.921825

Filename

4492811