Áron Szabó, Szilárd Zsigmond
Determining the optimal signal power based on physical effects in CWDM optical networks
To increase the signal power in optical networks is crucial to extend the maximum transmission distance. However, the nonlinear behavior of the optical fiber limits the signal power e.g. the span of the all-optical network. This paper presents an analytical model and calculation results for the signal quality degradation in an 8-channel and in an 18-channel, 2.5 Gbps coarse wavelength-division-multiplexing (CWDM) system. Based on the proposed model and performed analysis we give the optimal value of the signal power at the transmitter point. The modeling of chromatic dispersion and Raman-scattering, the two main constraints of CWDM optical networks is also presented in detail.