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- W2091245305 abstract "We developed a 4×4 SFQ network switch prototype system and demonstrated its operation at 10Gbps. The system's core is composed of two SFQ chips: a 4×4 switch and a 6-channel voltage driver. The 4×4 switch chip contained both a switch fabric (i. e. a data path) and a switch scheduler (i. e. a controller). Both chips were attached to a multichip-module (MCM) carrier, which was then installed in a cryocooled system with 32 10-Gbps ports. Each chip contained about 2100 Josephson junctions on a 5-mm×5-mm die. An NEC standard 2.5-kA/cm2 fabrication process was used for the switch chip. We increased the critical current density to 10kA/cm2 for the driver chip to improve speed while maintaining wide bias margins. MCM implementation enabled us to use a hybrid critical current density technology. Voltage pulses were transferred between two chips through passive transmission lines on the MCM carrier. The cryocooled system was cooled down to about 4K using a two-stage 1-W cryocooler. We correctly operated the whole system at 10Gbps. The switch scheduler, which is driven by an on-chip clock generator, operated at 40GHz. The speed gap between SFQ and room temperature devices was filled by on-chip SFQ FIFO buffers or shift registers. We measured the bit error rate at 10Gbps and found that it was on the order of 10-13 for the 4×4 SFQ switch fabric. In addition, using semiconductor interface circuitry, we built a four-port SFQ Ethernet switch. All the components except for a compressor were installed in a standard 19-inch rack, filling a space 21 U (933.5mm or 36.75 inches) in height. After four personal computers (PCs) were connected to the switch, we have successfully transferred video data between them." @default.
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- W2091245305 date "2008-03-01" @default.
- W2091245305 modified "2023-09-27" @default.
- W2091245305 title "Design and Demonstration of a 4 x4 SFQ Network Switch Prototype System and 10-Gbps Bit-Error-Rate Measurement" @default.
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- W2091245305 doi "https://doi.org/10.1093/ietele/e91-c.3.333" @default.
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