Multi-Slot Batch-Transfer Optical Packet Switch

Performance Model of Deflection-Routed Multi-Slot Batch-Transfer Networks

“…The timing diagram for the packets at input link I1 of the proposed optical switch with W = 3, where Td is a packet transmission time, Tg is the required guard time for preventing crosstalk between packets, and Tsw is the required reconfiguration time for switch SW. Fig. 1 The multi-slot batch-transfer (MSBT) switch architecture of a 2 × 2 optical switch [4]. delayed by D i , i = 1, …, W with the FDLs.…”

“…Every W time slots, a new batch of W input packets are presented to SW. SW therefore only needs to reconfigure itself once per W time slots to transfer the 2W packets to the output links. Using the MSBT switch architecture, we can build optical packet switches using slow switching fabrics with reconfiguration time T sw of up to W -1 time slots [4].…”

“…It has been shown in [4] that we can operate the MSBT switches in a time slot interchanger (TSI) mode to reduce the packet contentions. For constant delay requirement, a packet must be assigned to the particular outputs of SW to keep the order of the packet in the W-packet batch at the output link, e.g., a packet at I 1,1 of Fig.…”

“…Recently, we have proposed a multi-slot batch-transfer (MSBT) switch architecture to solve this problem. With the MSBT architecture, one can use slow switching fabrics with reconfiguration time T sw larger than the packet guard time T g to build the required optical packet switches [4]. The value of T sw will no longer be important for the system throughput.…”

“…One advantage of MSBT networks is that the MSBT switches can provide the required multichannel capability without extra hardware. Figure 1 shows the multi-slot batch-transfer (MSBT) switch architecture of a 2 × 2 optical switch where I 1 , I 2 and O 1 , O 2 are the input and output links, respectively [4]. At each input link, the 1 × W optical splitter and its W fiber delay lines (FDLs) form an optical packet serial-to-parallel (S-P) transmission converter.…”