報告書番号

R14006

タイトル（和文）

光ファイバを活用したマイクロ波無線設備の耐雷性能向上（その3）―実無線機による通信品質評価と信頼度確保の検討―

タイトル（英文）

Lightning protection of microwave radio equipment using optical fiber (3) -Evaluation of communication characteristics using actual radio equipment and highly reliable configuration-

概要 （図表や脚注は「報告書全文」に掲載しております）

当所ではマイクロ波無線設備の耐雷性能向上のために導波管の代わりに電気絶縁に優れた光ファイバを利用した構成を提案している。提案方式は光電波融合と光ファイバ給電を適用しており，これまでに模擬信号を用いた室内実験により性能の把握を進めてきた。
本報告では，提案方式の実用化に向けて実施した，屋外に設置可能な装置の試作および，実無線機を用いた通信品質特性の把握，高い信頼度を維持できる構成の検討について報告する。

概要 （英文）

Microwave radio equipment is occasionally damaged by lightning because an antenna on a communication tower is connected to microwave radio equipment by waveguide directory. We have proposed a system configuration using radio over fiber (RoF) links instead of waveguides.
In this report, newly developed antenna side O/E (optical/electrical), E/O (electrical/optical) converter box is introduced and results of bit error rate (BER) measurements using real radio equipment are also described. In the experiments it was successfully confirmed that power penalty was below 1 dB in transmitting side RoF link. Furthermore communication characteristic was improved by a few dB in receiving side RoF link, because the RoF link acted as preamplifier and high CNR (carrier-to-noise ratio) signal without loss of waveguide can be used in optical modulation at antenna side E/O convertor. It was clear that the proposed system had enough communication characteristics. In addition system configuration was also studied from the point of reliability. It was confirmed that the proposed system with will not add significant degradation of unavailability ratio compared with existing system as some units are properly duplicated.

報告者

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