ROF Technologies Applied for Cellular and Wireless Systems

Author

Nakajima, Nobuo

Author_Institution

The University of Electro-Communications, Chofugaoka 1-5-1, Chofu-shi, Tokyo, 182-8585 Japan

fYear

2005

fDate

12-14 Oct. 2005

Firstpage

11

Lastpage

14

Abstract

Two kinds of ROF systems are presented. First kind is applied for current cellular systems in Japan. Indoor service area is covered by ROF access units which are connected to an base ROF unit by optical fiber cables. The features are the compactness of the equipment and triple bands operation. Second kind adopts new ROF technologies. It can be used in the various situation, even usual ROF systems are not applicable, since it operates without electric power supply. Key technologies are impedance matching between RF circuits and E/O devices, ultra low power consumption RF amplifier, and optical power transmission. Experiments were carried out at 2.45 GHz band. E/O device conversion loss was reduced around 7 dB by 3-stub type impedance tuner. Electric power of 26.5 mW was obtained at the base station. By using an RF amplifier, no degradation was observed for reverse link transmission.

Keywords

ROF; cellular system; micro cell; optical power transmission; Circuits; Energy consumption; Impedance matching; Optical devices; Optical fiber cables; Power supplies; Power transmission; Radio frequency; Radiofrequency amplifiers; Stimulated emission; ROF; cellular system; micro cell; optical power transmission;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Photonics, 2005. MWP 2005. International Topical Meeting on

Print_ISBN

89-950043-3-9

Type

conf

DOI

10.1109/MWP.2005.203529

Filename

1590257