Choice of MUX/DEMUX filter characteristics for NRZ, RZ, and CSRZ DWDM systems

Author

Pfennigbauer, Martin ; Winzer, Peter J.

Author_Institution

Inst. fur Nachrichtentechnik und Hochfrequenztechnik, Vienna Univ. of Technol., Horn, Austria

Volume

24

Issue

4

fYear

2006

fDate

4/1/2006 12:00:00 AM

Firstpage

1689

Lastpage

1696

Abstract

This paper investigates the influence of filter bandwidth and flank steepness of both multiplexing and demultiplexing filters in dense wavelength division multiplexed systems (spectral efficiency 0.8 b/s/Hz) in the presence of coherent wavelength division multiplexing (WDM) crosstalk. Using a recently introduced technique for the statistically reliable performance prediction of systems impaired by coherent WDM crosstalk, this paper presents numerical results for nonreturn-to-zero (NRZ), 33% duty-cycle return-to-zero (RZ), and 67% duty-cycle carrier-suppressed return-to-zero signals. This paper confirms that steep filter flanks are generally preferable, both in terms of optical signal-to-noise ratio penalty and in terms of filter bandwidth tolerance.

Keywords

demultiplexing equipment; multiplexing equipment; optical communication equipment; optical crosstalk; optical fibre communication; optical filters; wavelength division multiplexing; CSRZ DWDM systems; DEMUX filter; MUX filter; NRZ DWDM systems; RZ DWDM systems; coherent WDM crosstalk; demultiplexing filter; dense wavelength division multiplexing; duty-cycle carrier-suppresses return-to-zero signals; duty-cycle return-to-zero signals; filter bandwidth; flank steepness; multiplexing filter; nonreturn-to-zero signals; optical signal-to-noise ratio penalty; steep filter flanks; Bandwidth; Optical crosstalk; Optical distortion; Optical filters; Optical noise; Optical receivers; Optical signal processing; Signal to noise ratio; Stimulated emission; Wavelength division multiplexing; Beat noise; bit error ratio (BER); coherent crosstalk; inband crosstalk; intersymbol interference (ISI); optical signal-to-noise ratio (OSNR); wavelength division multiplexing (WDM);

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2006.870972

Filename

1618758