Multi-OLT and multi-wavelength PON-based open access network for improving the throughput and quality of services

Abstract

Passive optical network (PON) provides enough bandwidth for combining multiple service providers׳ in addition to the fiber to the home (FTTH) network. Multiple optical line terminals (multi-OLT) PON-based hybrid network is an efficient access network that provides an effective solution for reducing the computational complexity of data packet processing of multiple service providers having different packet lengths and data rates. However, in the multi-OLT PON-based hybrid networks, data transmission in the single upstream channel requires a complicated dynamic bandwidth allocation (DBA) algorithm for improving the bandwidth sharing efficiency among the multiple service providers. In this paper, we propose a new network architecture for a PON-based open access network (OAN) where every optical network unit (ONU) of the PON will be shared by all the service providers and in the central office multiple OLTs will be connected to handle the data packets of multiple service providers. In the upstream direction, we propose to use multiple wavelengths for modulating the data packets of multiple service providers and to avoid the requirement of a complicated DBA algorithm. The simulation results show that the multi-OLT and multi-wavelength PON-based OAN (MM-OAN) provides higher bandwidth utilization, higher upstream efficiency and higher throughput with a lower overhead to data ratio and jitter than the single-OLT and single wavelength PON-based OAN (SS-OAN). The overall throughput of the proposed scheme has been increased more than by a factor equal to the number of wavelengths employed than that of the SS-OAN.