Quality of service (QoS) provisioning is considered to be one of the characteristic features in Optical Burst Switching Networks. Furthur, Survivabiltiy of optical networks is more challenging since single point failure may lead to huge data loss that could occur due to the large capacity of optical fibers.Hence, there arises a need for formulating an effective and efficient QoS provisioning mechanism in Optical Burst Switching Networks. In this paper, we formulate a Path Stability based Enhancement Mechanism for QoS Provisioning (PSEMQoS) which handles both synchronous and asynchronous path based QoS provisioning. The proposed PSEMQoS mechanism is highly adaptive to variations in traffic patterns by incorporating dynamic exchange of wavelengths and time slots for resolving bursty switch over problem. The proposed PSEMQoS also incorporates a Link stability based Opportunistic routing algorithm for estimating a reliable path between the source and destination in a hop by hop manner for handling bursty traffic. The performance of PSEMQoS is exhaustively studied through ns-2 simulations with the aid of evaluation parameters such as Jitter, Packet delivery ratio, Burst loss ratio and average goodput. From the simulation results obtained, it is transparent that PSEMQoS successfully reduces the burst loss probability when compared to the other path based QoS provisioning mechanisms available in the literature.
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