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Research on Radio-on-Fiber Access Systems Eliminating Electric Power Supply at Base Station

基站免供电光纤无线接入系统研究

基本信息

批准号：
16360187
负责人：
MIKI Tetsuya
金额：
$ 9.6万
依托单位：
The University of Electro-Communications
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

The purpose of this research is to realize high effectiveness and performance Radio-on-Fiber (ROF) access system eliminating electric power supply at antenna base station and to study for practical use of it.At first, we tried to improve the conversion efficiencies of optical modulator and photo-diode, which are indispensable elements to ROF system. In this work, applying to three-stub impedance matching, the conversion efficiencies of optical modulator and photo-diode were improved to 2.5 dB and 4.0 dB, respectively. On the other hand, to improve the efficiency of optical-to-electrical conversion, it was theoretically clarified that the maximum efficiency of about 50 % was improved by using the wavelength conversion technique of the fluorescent material, which was made from rare-earth metal.Next, in order to improve the conversion efficiency of optical modulator, we proposed a novel scheme using heterodyne technique based on ROF access system eliminating electric power supply at antenna base station. In the case of down-link transmission, using dual cascaded optical modulator at center station, the electrical signal at 2.45 GHz is down-converted into 0.45 GHz, and then, the transmission performance of 7.5 dB was improved at base station side, compared to conventional scheme. In the case of up-link transmission, to realize ROF system eliminating electric power supply at base station, we proposed up-link transmission scheme, which down-converts into 0.45 GHz by mixing 2.45 GHz received RF signal and local signal, which is generated by the optical signal delivered from the central station. In this scheme, the transmission performance of about 8.0 dB was improved in comparison with conventional scheme.

本研究的目的是实现高效、高性能的光纤无线电（ROF）接入系统，消除天线基站的电力供应，并对其实际应用进行研究。首先，我们尝试提高光调制器和光电二极管的转换效率，它们是ROF系统不可或缺的元件。在这项工作中，应用于三短截线阻抗匹配，光调制器和光电二极管的转换效率分别提高到2.5 dB和4.0 dB。另一方面，为了提高光电转换效率，从理论上阐明，采用稀土金属荧光材料的波长转换技术，最大效率可提高约50%。接下来，为了提高光调制器的转换效率，我们提出了一种基于ROF接入系统的外差技术，消除了天线底座的电力供应。车站。下行传输时，中心站采用双级联光调制器，将2.45GHz电信号下变频至0.45GHz，基站侧传输性能较传统方案提高7.5dB。在上行链路传输的情况下，为了实现消除基站供电的ROF系统，我们提出了上行链路传输方案，通过将2.45GHz接收到的射频信号与由中心站发送的光信号产生的本地信号混合，下变频到0.45GHz。该方案的传输性能较传统方案提高了约8.0 dB。