Patent ID: 7660531

Claim:
A remote access unit (RAU) apparatus coupled to a central station (CS) of an RoF network through at least one optical fiber, comprising: a first and second antenna port coupled to at least two antennas; a first and second optical fiber port coupled to the at least one optical fiber; a first coupler for decoupling a first downstream signal of a first duplexing method and a second downstream signal of a second duplexing method, which are input through the first optical fiber port; a circulator for outputting the first downstream signal input from the first coupler to the first antenna port and outputting a first upstream signal of the first duplexing method input from the first antenna port to the second optical fiber port; and a second coupler for outputting the second downstream signal input from the first coupler to the second antenna port and outputting a second upstream signal of the second duplexing method input from the second antenna port to the second optical fiber port.