Hideyuki Ono

20Gbps/ch optical interconnection between SERDES devices over distances from chip-to-chip to rack-to-rack

20-Gbps signal transmission of up to 100 m between two SERDES devices has been demonstrated using newly developed driver and receiver ICs tuned to the characteristics of VCSELs, photodiodes, and electrical transmission line with which they are used.

Present Status of Pin-post Water-cooled Silicon Crystals for Monochromators of SPring-8 X-ray Undulator Beamlines

Several monochromator first silicon crystals of SPring‐8 undulator beamlines are effectively cooled with water at lower running costs. The crystals were newly designed and the fabrication process was improved in order to reduce various strains to deteriorate the performance. Results of performance tests show that the initial performance of the crystal has been enhanced sufficiently. Deterioration of the performance with time is discussed as a remaining problem.

Optical Interconnection Technology for the Next Generation Supercomputers

This article describes the new optical interconnection technology which would be indispensable to realize high throughput supercomputer. To achieve 20 Gbps signal transmission between two LSIs of the supercomputer, we have developed every necessary component of optical interconnect system such as vertical-cavity surface-emitting laser (VCSEL), PIN-photodiodes (PD), electrical transmission line, driver IC and receiver IC. Each device is designed to optimize high speed signal characteristics of throughout transmission system. With these components total transmission system between two LSIs is developed and 20-Gbps 100 m signal transmission is successfully demonstrated. This transmission system is applicable to actual supercomputer.

Color image transmission system for prepress with ADCT compression algorithm

This paper outlines the compression and transmission system developed for high- quality color image data for prepress. This system has resulted in highly-efficient compression of color image data by using DCT(Discrete Cosine Transform) - SQ(Scalar Quantization) coding scheme adopted as the basic algorithm of the international standard for color and still picture coding in ISO. This system allows selection of a compression ratio in the range of 1/2 - 1 /50. As a result of evaluations a quality image picture for printing is obtained at a data compression ratio ranging from 1/5 - 1/10. By using the newly-developed high-speed CODEC LSIs, this system has enabled real-time data transmission to 64Kbps digital lines.