Patent ID: 7796891

Claim:
A radio-over-fiber (ROF) system for supporting a plurality of services, the system comprising: a central access platform (CAP) and a remote access unit (RAU); the central access platform for: providing time division duplexing (TDD) service, frequency division duplexing (FDD) service, and broadcasting services, converting a TDD downward signal and FDD/broadcasting downward signals into optical signals; transmitting the converted optical signals to the remote access unit, receiving optical signals from the RAU; converting a TDD upward signal and an FDD upward signal in the receiving optical signals, into electric signals; and separating the upward and downward signals from each other using an optical circulator; and the remote access unit for: converting the TDD downward signal and FDD/broadcasting downward signals transmitted from the CAP into electric signals, converting the TDD upward signal and FDD upward signal to be transmitted to the CAP into optical. signals and separating upward and downward signals from each other using an optical circulator means, wherein the RAU includes a plurality of signal filtering/separating/combining units, which wirelessly emit the converted TDD downward signal and FDD/broadcasting downward electric signals through an antenna, and which separate wirelessly-received TDD upward signal and FDD upward signal from each other: wherein the FDD/broadcasting downward signals have separately established frequency bands, and wherein the optical circulator means includes a first circulator that is separately coupled to inward and downward signals of the TDD service and a second circulator coupled to both the FDD service and the broadcasting service.