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Fujikura Technical Review

No.53 January, 2024

ISSN 2436-9268
ISSN 0388-225X
Published by :
Fujikura Ltd.
1-5-1, Kiba, Koto-ku, Tokyo 135-8512, Japan


Materials Technology Development Using Materials Informatics

Materials informatics (MI) is a development approach that actively utilizes computer science, such as computational and data science, in addition to conventional experimental and theoretical science. We have positioned MI as one of the fundamental materials technologies and applied it to a wide range of products, which has led to various outcomes. This paper introduces the most frequently used MI methods and presents a case in which we succeeded in significantly shortening the development period of cable sheaths by utilizing data science.


Loss performance of a field-deployed cable link with 288 four-core multicore fibers

A high-density optical fiber cable link with 288 four-core multicore fibers (MCFs) and 288 pairs of fan-in-fan-out devices was deployed in the field, and its losses were evaluated. No excess losses were observed from the MCF-related components during the field installation.


6912-fiber Optical Cable using 160 µm fiber for Data center

Recently the demand of fibers has been greatly increasing with the growth of cloud services, 5G commercialization, automated car driving systems and so on. To achieve these developments, we need to deploy fiber communication networks in an economical and efficient way. We have developed 6912-fiber cable using fibers having 160 µm coating diameter and 80 µm cladding diameter. New cable has succeeded in reducing the cable diameter and weight significantly. Also by reducing the cable outer diameter, the fill ratio in a 1.5-inch underground conduit is 50%. The cable has satisfactory mechanical and environmental performance in accordance with GR-20-CORE Issue4.


A Compact SPDT Switch Amplifier for 5G Millimeter-wave Applications

This paper describes a newly developed single pole double throw (SPDT) switch amplifier. It is designed to implement in a frequency conversion integrated circuits for 3GPP n257, n258 and n261 bands and its operating frequency range is from 29.15 to 34.40 GHz. The SPDT switch amplifier provides local oscillator (LO) signals to either a transmitter mixer or a receiver mixer and realizes more than 52 dB ON/OFF ratio and 12 dB small signal gain over the frequency range. Its gain can be changed to adjust the output power to the required LO power. The SPDT switch amplifier is fabricated using 0.13-μm SiGe BiCMOS technology and the area of core is 0.24 mm2.