DocumentCode :
785580
Title :
Coherent crosstalk in ultradense WDM systems
Author :
Winzer, Peter J. ; Pfennigbauer, Martin ; Essiambre, René-Jean
Author_Institution :
Lucent Technol. Bell Labs, Holmdel, NJ, USA
Volume :
23
Issue :
4
fYear :
2005
fDate :
4/1/2005 12:00:00 AM
Firstpage :
1734
Lastpage :
1744
Abstract :
We present extensive numerical studies on the determination of coherent wavelength-division multiplexing (WDM) crosstalk penalties for ultradense wavelength-division multiplexed (DWDM) systems, focusing on carrier-suppressed return-to-zero (CSRZ) as well as on 67% duty cycle differential phase-shift keying (67% RZ-DPSK) at a spectral efficiency of 0.8 b/s/Hz. Our analyses reveal large statistical variations in the predicted required optical signal-to-noise ratio (OSNR) when changing the WDM channels´ interference conditions, in particular their relative optical phases and their relative time shifts. The strong impact of the exact WDM interference conditions can lead to simulation inaccuracies of many decibels when using standard OSNR simulations techniques. In measurements of DWDM system performance, the long averaging time of bit error ratio (BER) test sets can hide these burst-error generating penalty variations, and may, therefore, lead to wrong interpretations, especially for systems employing forward error correction (FEC). To overcome the DWDM simulation problem, we introduce and thoroughly assess a new simulation technique that allows us to efficiently and accurately capture the average required OSNR penalty for DWDM systems with negligible statistical error.
Keywords :
differential phase shift keying; error statistics; forward error correction; light coherence; optical crosstalk; optical fibre networks; telecommunication channels; wavelength division multiplexing; BER; DWDM; RZ-DPSK; WDM channels interference; bit error ratio; carrier-suppressed return-to-zero; coherent crosstalk; coherent wavelength-division multiplexing; differential phase-shift keying; forward error correction; optical signal-to-noise ratio; spectral efficiency; ultradense WDM systems; Differential phase shift keying; Forward error correction; Interference; Optical crosstalk; Optical noise; Signal analysis; Signal to noise ratio; System performance; Time measurement; Wavelength division multiplexing; Bit error ratio (BER); coherent crosstalk; forward error correction (FEC); in-band crosstalk; wavelength-division multiplexing (WDM);
fLanguage :
English
Journal_Title :
Lightwave Technology, Journal of
Publisher :
ieee
ISSN :
0733-8724
Type :
jour
DOI :
10.1109/JLT.2005.843837
Filename :
1424150
Link To Document :
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