An all optical header separation structure and scheme based-on SOA and improved delay interferometer were presented in the paper. The parameters of improved SOAdelay interferometer are discussed and analyzed to optimize the performance of optical header separation with the proposed scheme. Numerical analysis and simulation show that more than 15 dB contrast ratio of the header separation is achieved when the rates of header and payload are 2.5 Gbit/s and 40 Gbit/s respectively. In addition, the system is simple structure, highly scalable and photonic integration.
The excess voids are produced in the export channel with first-fit-void-filling (FF-VF) algorithm for the variable length optical packet switch (OPS). The character of void occurred in the OPS channel scheduling is analyzed. The void filling scheduling algorithm based-on ACK short length packet first is presented to decrease the average waiting time in the queue for short packet. For reducing the size of void, the hybrid buffers solution with electronic memory and fiber delay line (FDL) is used in the OPS node. The ACK packet with short length is buffered in the electronic memory, while the non-ACK packet is buffer in the FDL. When the void size on the FDL is fit for the ACK packet, the ACK packet is scheduled to FDL immediately. The results of simulation show that the proposed scheduling makes use of ACK packets first void filling scheduling mechanism to reduce FDL excess load, increases output utilization and reduce packet loss ratio for asynchronous optical network. This approach is shown to minimize the FDL numbers with the feature of high stabilization and photonic integration and to improve real time TCP traffic.
Contention resolution is one of the key issues for optical packet switching (OPS). An all optical fiber delay line (FDL) shared buffering architecture based on traffic load selective FDL buffer mode was brought forward to resolve the optical packet time contention. This traffic load selective FDL buffering architecture worked as expanded output shared buffer when the traffic load of incoming OPS input port is light. When the incoming traffic load is heavy, the proposed buffering architecture worked as feedback shared buffer to allow contended packet reenter the fiber delay line to reduce packet discarded. The analysis and simulation results show that the proposed FDL buffer architecture can decrease OPS node optical packet loss probability effectively and reduce required FDL number largely.
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