Open AccessAnalysis of non-degenerate four-wave-mixing crosstalk in DWDM system
Author(s) -
Jiaxing Du
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.1046
Subject(s) - four wave mixing , wavelength division multiplexing , physics , optics , channel spacing , degenerate energy levels , multiplexing , duty cycle , wavelength , computer science , telecommunications , nonlinear optics , quantum mechanics , laser , power (physics)
Four-wave mixing (FWM) tone degrades system performance in dense wavelength-division-multiplexed (DWDM) optical transmission. A method of evaluating the efficiency of non-degenerate FWM tone for return-to-zero modulation scheme is developed without ignoring group-velocity walk-off of random bit sequence between channels. A theoretical model evaluating the standard deviation of FWM tone is then given. Some calculation examples show that, when the duty cycle and channel separation become small, the initial relative time delay of random bit sequences in different channels and fiber dispersion are more important to the FWM noise. Choosing optimal values of them is important to make the system to have low dispersion and small FWM crosstalk.