OBS WDM ring networks with tunable transmitters and fixed receivers

In this paper, optical burst switched (OBS) wavelength division multiplexing (WDM) ring architecture is proposed for supporting metropolitan mea networks (MAN). The OBS ring architecture consists of N OBS nodes connected by optical fibers, which support N data burst wavelengths and a separate control wavelength. There are a pair of tunable transmitter and fixed receiver (TT-FR) for data burst wavelengths and a pair of fixed transceiver for a control wavelength in each node. Each node has its own receiving wavelength. Additionally, a multi-token protocol for OBS ring network, named modified round-robin manner / token (M-RR/Token), is proposed to improve end-to-end delay and queue size. The performance is evaluated by simulation.