HTS Sampler With Optical Signal Input

Maruyama, Michitaka; Uekusa, K.; Konno, T.; Sato, Nobuya; Kawabata, M.; Hato, Tsunehiro; Suzuki, Hideo; Tanabe, K.

doi:10.1109/tasc.2007.898679

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…For observation of optical signals by the HTS sampler, we employed a uni-traveling-carrier photodiode (UTC-PD) [42] and confirmed that it has sensitivity and bandwidth high enough for connecting to the HTS sampler at low temperatures [43]. A non-magnetic module in which a sampler chip can be mounted closely to the UTC-PD has been developed by Advantest Laboratory, as shown Fig.…”

Section: Sampler Systems and A/d Convertermentioning

confidence: 94%

Recent Progress in SFQ Device Technologies in Japan

Tanabe

Hidaka

2007

IEEE Trans. Appl. Supercond.

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Recent progress in single flux quantum (SFQ) device technologies in Japan is described, mainly focusing on those developed in the NEDO "Superconductors Network Device Project" which includes developments of both LTS and HTS devices. The advanced Nb process which consists of a planarized structure with nine Nb layers and 10 kA cm 2 Josephson junctions (JJs) has been developed. This enables fabrication of chips including 100,000 JJs and operating frequency up to 80 GHz. We have also developed the CAD tool by which one can generate SFQ circuit layouts including about 400,000 JJs from logic descriptions. For demonstration of a small-scale switch system, a 4 4 switch chip, a 117 Gbps multichip-module (MCM) technology, and a packaging technology with 32-ch 10 Gbps I/Os to an MCM have been developed. By using the multilayer process with three HTS epitaxial layers and interfaceengineered ramp-edge JJs, we demonstrated operation of SFQ circuits with up to 200 JJs. A variety of elementary SFQ circuits such as a T-FF and a 1:2 switch required for an A/D converter front-end circuit have been designed based on a new layout method, and their operation at 30-50 K has been confirmed. A prototype sampler system is being developed for demonstration of bandwidth over 100 GHz for optical input signals.

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Section: Sampler Systems and A/d Convertermentioning

confidence: 94%

Recent Progress in SFQ Device Technologies in Japan

Tanabe

Hidaka

2007

IEEE Trans. Appl. Supercond.

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Compact cryocooling system for HTS sampler

Suzuki¹,

Maruyama²,

Hato³

et al. 2007

Physica C: Superconductivity and its Applications

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Review of Devices, Packaging, and Materials for Cryogenic Optoelectronics

Bardalen¹,

Akram²,

Malmbekk³

et al. 2015

Journal of Microelectronics and Electronic Packaging

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In this article, developments and techniques related to optical-fiber-coupled devices operating at cryogenic temperatures are reviewed. These devices include superconducting electronics and photodetectors. Superconducting circuits have a number of suitable characteristics in terms of speed and efficiency, lower power consumption, and traceability to fundamental quantum properties. Thus, applications are found in a number of technologies, such as communication and metrology. Often, the devices are coupled by an optical fiber link to an external source. A suitable design of the optical coupling at cryogenic temperatures entails considerations of electromagnetic behavior, geometry, components, material choices, and customized packaging schemes. Minimizing thermomechanical stresses and deformation is a challenge due to the extreme temperature span, from room temperature to below 10 K. Due to the thermomechanical properties at low temperatures, with high contraction and brittleness of some materials, careful design and testing is dictated for the method of mechanical attachment and alignment techniques to avoid failure. Solutions for the efficient, robust optical coupling remain a challenge for some of these devices.

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HTS Sampler With Optical Signal Input

Cited by 4 publications

References 12 publications

Recent Progress in SFQ Device Technologies in Japan

Recent Progress in SFQ Device Technologies in Japan

Compact cryocooling system for HTS sampler

Review of Devices, Packaging, and Materials for Cryogenic Optoelectronics

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