Patent ID: 8041222

Claim:
A radio over fiber link apparatus for transmitting/receiving radio frequency up/downlink signals in a Time Division Duplex(TDD) mobile communication system, the radio over fiber link apparatus comprising: a center site comprising: a gain block for: receiving the radio frequency signals from the access point of the mobile communication system, amplifying signal components after reducing a noise component of the radio frequency signals, and outputting the amplified signals; and a first electro-optic converter comprising: an optical signal generator for generating optical signals; an interferometer type modulator for modulating optical signals generated from the optical signal generator; and a Bias-T for receiving the amplified signals from the gain block-through one port thereof, and receiving TDD signals through another port thereof and providing the received TDD signals as bias signals to the modulator, and outputting the modulated optical signals as optical signals; and a remote site for: receiving the optical signals converted by the first electro-optic converter; converting the optical signals back into radio frequency signals; and transmitting the radio frequency signals, wherein the remote site includes a first photoelectric converter for converting each of the optical signals transmitted from the center site into a corresponding radio frequency signal.