Journal
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Volume 21, Issue 3, Pages 839-842Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2010.2095813
Keywords
Optical detectors; optical waveguide components; SFQ circuits; superconducting integrated circuits
Funding
- Grants-in-Aid for Scientific Research [22226009] Funding Source: KAKEN
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Single flux quantum (SFQ) circuits and optical circuits are expected to be used in next-generation integrated circuits. This study investigates basic technologies for integrating optical circuits with SFQ circuits to exploit the advantages of both technologies. We calculated, designed and evaluated metal-clad waveguides, which can be fabricated by the ISTEC standard process (STD2). Light propagates along an 830-mu m long waveguide with a propagation loss of 16 dB/mm. We also designed and evaluated an optical-electrical (O-E) converter that uses a Josephson junction, which can be fabricated by the same process used to fabricate the SFQ circuits. When an optical signal with a peak power of 1.15 mW at 1.548 mu m is input, the Josephson O-E converter generates SFQ pulses.
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