ON-OFF traffic models for a hybrid TDM-WDM PON with dynamic wavelength allocation

Future access networks will have to meet the ever increasing demand for capacity. Optical access systems are now considered as a viable alternative solution to the xDSL technologies for delivering future integrated broadband services. Nowadays, passive optical networks are the most promising and cost-effective class of fiber access systems. In this paper we develop teletraffic loss models for calculating connection failure probabilities (due to unavailability of a wavelength) and call blocking probabilities (due to the restricted bandwidth capacity of a wavelength) in hybrid TDM-WDM passive optical networks with dynamic wavelength allocation. The optical access network accommodates bursty services of ON-OFF (transmission or no transmission) type. The proposed models are derived from one-dimensional Markov chains which describe the wavelengths occupancy in the optical access network. The accuracy of the proposed models is validated by simulation and was found to be quite satisfactory.