Optical fiber link radio expansion system for weak reception area

In the design of an optical fiber link radio expansion system, which enables subscribers to use cellular phones in weak reception areas, we have to consider two important points. One is the dynamic range defined by the carrier-to-noise ratio and intermodulation distortion. The other is the cost of a laser diode. To cope with these problems, we use a frequency conversion technique, because we can select one of the many analog laser diodes developed mainly for CATV use. Besides, the total system in the future will becomes flexible since it will allow us to transmit several different band services simultaneously with low frequency LDs by rearranging their frequency bands.