Study on the optical input interface for Nb single-flux-quantum logic circuits
نویسندگان
چکیده
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 0.044 nm at around 1550 nm, which corresponds to the laser beat frequency of 5.5 GHz. The output signals from the 13and 14-stage TFFs were observed and it showed the input SFQ frequency of 5.5 GHz. Thus, the authors demonstrated the conversion of the optical signal to SFQ signal and succeeded in driving the SFQ circuit. © 2006 American Institute of Physics. DOI: 10.1063/1.2410216
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