Title :
Coherent and incoherent crosstalk in WDM optical networks
Author :
Shen, Yunfeng ; Lu, Kejie ; Gu, Wanyi
Author_Institution :
Opt. Commun. Centre, Beijing Univ. of Posts & Telecommun., China
fDate :
5/1/1999 12:00:00 AM
Abstract :
The impact of coherent and incoherent crosstalk on an optical signal passing through optical cross-connect nodes (OXC´s) in wavelength division multiplexing (WDM) optical networks is studied, and the analytical expressions are given. Such crosstalk will be generated when the optical propagation delay differences of optical paths in an OXC do not exceed the coherent time of the lasers. While causing fluctuation of signal power, coherent crosstalk may cause noise or not, depending on the relationship between the optical propagation delay differences and the time duration of one bit of the signal. Incoherent crosstalk may cause very high noise power, because it can be a coherent combination of crosstalk contributions. The statistical impact of all crosstalk contributions on signal is studied by simulation, and the concept of quantile is proposed to relax the crosstalk specification requirement for components. The crosstalk specification requirements are then obtained for components used in WDM optical networks with different scales
Keywords :
light coherence; optical crosstalk; optical fibre networks; optical noise; wavelength division multiplexing; WDM optical network components; WDM optical networks; coherent crosstalk; crosstalk specification requirement; incoherent crosstalk; optical cross-connect nodes; optical paths; optical propagation delay differences; optical signal; propagation delay differences; time duration; wavelength division multiplexing; Delay effects; Laser noise; Optical crosstalk; Optical fiber networks; Optical noise; Optical propagation; Propagation delay; Signal analysis; WDM networks; Wavelength division multiplexing;
Journal_Title :
Lightwave Technology, Journal of
