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Yoshihiko UEMATSU Shinji MATSUOKA Kohji HOHKAWA Yoshiaki YAMABAYASHI
This paper proposes a universal structure for STM-N(N=1, 2, 3, ) multiplex line terminals that only utilizes N chips CMOS LSIs for Section OverHead (SOH) processing. The uniquely configured LSIs are applicable to any STM-N line terminal equipment. Reasonable frame alignment performance attributes, such as the maximum average reframe time, false in-frame time, out-of-frame detection time, and misframe time, are calculated for the configuration. A prototype SOH processing LSI built on 0.8m BiCMOS technology successfully realizes the functions needed for multiplex section termination. The STM-64 frame is also demonstrated using the proposed circuit configuration and prototype LSIs.
Kohji HOHKAWA Shokichiro YOSHIKAWA
This letter predicts that multichannel SAW filters can be constructed by using two dimensionally periodic reflective dot array (RDA). A three channel device, where one channel is with direct SAW propagation path and the others are with offset SAW propagation pathes, was constructed for experimental verification.
Kohji HOHKAWA Shinji MATSUOKA Kazuo HAGIMOTO Kiyoshi NAKAGAWA
Optical fiber transmission systems have advanced rapidly with the advent of highly advanced electronic and optical devices. This paper introduces several IC technologies required for ultra-high-speed optical transmission and overviews current IC technologies used for the existing and developing optical fiber trunk transmission systems. Future trends in device technologies are also discussed.