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Conference on Lasers and Electro-Optics

Integrated Optical Input Interface for Single-Flux-Quantum Circuit Buffer Memory

Satoshi Shinada, Hirotaka Terai, Zhen Wang, Naoya Wada

Published Jan 1, 2010• 0 citations
Publisher

Abstract

We have developed an optical input module for single-flux-quantum (SFQ) circuit to achieve high-speed buffer memory in the optical packet switch. We succeeded in demonstrating SFQ pulse generation by optical pulse input with 100-ps width.
DOI
10.1364/cleo.2010.jthe71

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With regard to sustaining future capacity of network traffic, the current hardware technology has a big bottleneck in terms of power consumption and insufficient operation speed. To overcome this bottleneck, we have developed a single flux quantum (SFQ) packet-switching circuit. We report recent progress in developing the SFQ packet-switching application. First, we demonstrate a 40 GHz, 160 Gb/s, 4 /spl times/ 4 packet switching circuit, which is currently the fastest clock frequency reported packet switch. Then, we describe a currently possible switching module using SFQ technology. Finally, we consider how SFQ technology can be used to scale the packet-switching capacity up to 100 Tbps.
The high-speed operation of a one-channel output interface for a single-flux quantum (SFQ) system has been demonstrated. The interface consisted of a Josephson latching driver, a room-temperature semiconductor amplifier, and a decision circuit module. The Josephson latching driver was fabricated by using a 2.5-kA/cm/sup 2/ standard Nb junction process and used to amplify an SFQ pulse into a 5.5-mV level signal at 10 Gb/s. The interface converted the SFQ pulse signal into a nonreturn-to-zero signal having an amplitude of 1 V at 10 Gb/s.
The authors have studied the optical input interface for Nb single-flux-quantum (SFQ) circuits and demonstrated its operation using photomixing technique. Two tunable lasers of C band were used for photomixing. We adopted a multistage toggle flip-flop (TFF) circuit as the main part of the test circuit. As the first trial, we used lasers with wavelength difference of 0.044nm at around 1550nm, which corresponds to the laser beat frequency of 5.5GHz. The output signals from the 13- and 14-stage TFFs were observed and it showed the input SFQ frequency of 5.5GHz. Thus, the authors demonstrated the conversion of the optical signal to SFQ signal and succeeded in driving the SFQ circuit.