Title :
Impact of modulation frequency on cross-phase modulation effect in intensity modulation-direct detection WDM systems
Author :
Cartaxo, Adolfo V T
Author_Institution :
Inst. de Telecomun., Inst. Superior Tecnico, Lisbon, Portugal
Abstract :
The impact of modulation frequency on the crossphase modulation (XPM) effect in intensity modulation (IM)-direct detection wavelength-division multiplexing systems is investigated theoretically and numerically. A simple expression for IM is derived, verified by simulation and its validity is presented. The dependence of XPM-induced IM on the fiber length, fiber dispersion, channel separation and pump modulation frequency is assessed. It is shown that at very low frequency the walkoff effect has almost no influence on the XPM-induced IM efficiency which increases with the square of the frequency; at higher frequency the IM efficiency can be reduced significantly by the walkoff and scales linearly with modulation frequency.
Keywords :
optical fibre communication; optical fibre theory; optical modulation; optical pumping; wavelength division multiplexing; WDM optical fibre communication; channel separation; cross-phase modulation effect; fiber dispersion; fiber length; intensity modulation-direct detection WDM systems; modulation frequency; pump modulation frequency; very low frequency; walkoff effect; wavelength-division multiplexing systems; Chirp modulation; Fiber nonlinear optics; Fluctuations; Frequency modulation; Intensity modulation; Optical fiber communication; Optical fiber polarization; Optical pumping; Phase modulation; Wavelength division multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
