A fiber distribution system for microcellular radio

A new fiber distribution system for mobile phone networks is proposed. In the system, at the base station, a single high power low relative intensity noise Nd:YAG laser is employed and shared by many microcells. At the radio port, an optical coupler is used to split the optical power into two ways: one for the downstream signal detection and the other remodulated by an amplitude modulator for the upstream signal. With proper frequency allocation, some intermodulation distortion can be prevented from falling into the band of the upstream signal. Theoretical analysis shows that this system, in conjunction with thermal noise suppression and modulator linearization techniques, may increase the channel capacity and enhance frequency reuse significantly.<>