Acousto-optic tunable filter (AOTF)

Abstract

RHiNET-3/SW is an optical network switch that enables high-performance parallel computing in a flooror building-area environment. It can provide 10-Gbps x 8-port network switching with 1-km transmission length using 12channel parallel optical links. The switch consists of eight pairs of IO-Gbps optical link modules, one-chip CMOS ASIC switch LSI and four CMOS ASIC deskew-LSIs. Each optical link module transmits 8B10B encoded 10-bit characters and a 1-bit transmission clock at a data rate of 1.25 Gbps. The deskew-LSI can adjust the skew of 256 ns in I-km multimode fiber ribbons. By the frame synchronization used in the deskew-LSI, RHiNET-3/SW provides a longtransmission-length synchronized parallel optical data transmission. RHiNET-3/S W provides topology-free, deadlockfree and reliable network communication for the high-performance parallel computing. In order to build topology-free and deadlock-flee network, the switch supports 32 virtual channels with 640-Byte buffer memory. By using large amount of embedded memory on the switch LSI, RHiNET-3/S W allows low-latency, high-bandwidth performance. To provide highly reliable network, the switch uses hop-by-hop retransmission mechanism. This mechanism does not require any software procedure such as TCP to maintain reliability. We produced a cabinet of RHiNET-3/SW as 1-unit height and a prototype system of RHiNET-3 in 19-inch rack. RHiNET-3/SW enables high-bandwidth (80 Gbps), and long-transmission-length( 1 km) network communication by means of distributed parallel computing. This work is done with Real World Computing Partnership (RWCP) Tsukuba research center and RWCP optical interconnection Hitachi laboratory.