RADIO OVER FIBER LINK SYSTEM FOR EMPLOYING MULTIPLE TYPES OF SERVICES

摘要

An optical-wireless link system for receiving various services is provided to enable an RAU(Remote Access Unit) to separate a TDD(Time Division Duplexing) down signal from an FDD(Frequency Division Duplexing) up signal, thereby eliminating influence of the TDD down signal and sending a broadcasting signal as well as the TDD down signal and an FDD down signal. A CAP(Central Access Platform)(31) performs TDD, FDD, and broadcasting services, individually converts a TDD down signal and FDD/broadcasting down signals into optical signals to send the optical signals to an RAU(33), and individually converts a TDD up signal and an FDD up signal transmitted as optical signals from the RAU(33) into electrical signals, then uses optical circulators(317,327) to separate up and down signals. The RAU(33) individually converts the TDD down signal and the FDD/broadcasting signals into electrical signals, individually converts the TDD up signal and the FDD up signal to be transmitted to the CAP(31) into optical signals, and uses optical circulators(337,347) to separate up and down signals.