Noise Reduction Device Using Novel Automatic Wavelength-Offset Control for Highly Stable Optical-Microwave Transmission Systems (Special Issue on Microwave Devices for Mobile Communications)

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概要

• 論文の詳細を見る

• A multi-terminal serial optical link (MSOL) achieves very simple and cost effective radio cell configurations because only one pair of fibers is needed. In addition, low cost Fabry-Perot laser diodes (FP-LDs) can be employed. MSOL has a substantial problem in that the beat noise degrades the C/N in the up-link. To reduce this noise, we propose using an automatic wavelength-offset control (AWOC) circuit. The AWOC circuit offsets the LD wavelength by controlling the laser bias current to minimise the RF band beat noise which is inherent in MSOL systems, and enables high C/N optical-microwave transmission. An experimental MSOL consisting of 5 radio access stations, each equipped with AWOC, is constructed to estimate the noise free dynamic range for 800-MHz 20-carrier signal transmission. The up-link comprises a single mode fiber connecting five 1.3-μm FP-LDs operating at 0.2 mW. The down-link consists of a single mode fiber and one 1.3-μm Distributed Feedback type Laser Diode (DFB-LD) emitting at 4.0 mW. The experimental device achieves over 15 dB noise reduction compared to MSOL without AWOC in the temperature range of 0 to 40℃. By using the proposed AWOC, MSOL can achive low cost optical fiber RF micro-cell systems that are easy to install. Additionally, when we install MSOL in the radio base station, the links become more cost effective than coaxial cable links; they offer a wide dynamic range and higher transmission quality.

• 社団法人電子情報通信学会の論文
• 1996-05-25

著者

• Tarusawa Yoshiaki

  Dept. Of Research And Development Ntt Mobile Communications Network Inc.

• Nojima Toshio

  Dept. Of Research And Development Ntt Mobile Communications Network Inc.

• FUTAKATA Toshiyuki

  Dept. of Service Development, NTT Mobile Communications Network Inc.

• ITO Yasushi

  Dept. of Research and Development, NTT Mobile Communications Network Inc.

• Futakata Toshiyuki

  Dept. Of Service Development Ntt Mobile Communications Network Inc.

• Ito Yasushi

  Dept. Of Research And Development Ntt Mobile Communications Network Inc.

関連論文

• Noise Reduction Device Using Novel Automatic Wavelength-Offset Control for Highly Stable Optical-Microwave Transmission Systems (Special Issue on Microwave Devices for Mobile Communications)

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