| 摘要 |
PROBLEM TO BE SOLVED: To supply a radio signal to an antenna dead zone by providing an optical transmission line ease of connection with low noise at a low cost with respect to an antenna feeder in a radio communication system. SOLUTION: A radio signal 100 from a mobile terminal equipment 3 is received by an antenna 71a and converted into an optical signal 202a by an optical transmission section 11a. The optical signal 202a is sent to a radio base station 5 by a multi-mode optical fiber transmission line 2a and converted into a radio signal 106a by an optical receiver 13a. The radio signal 106a uses an optical branching device 30 to add radio signals from antennas 71b, 72 and the sum is given to a MODEM 40. Furthermore, the radio base station 5 branches an output radio signal 109 from the MODEM 40 by the branching device 30 and part of signal is converted into an optical signal 201a by an optical transmitter 10a. The optical signal 201a is sent through a multi-mode optical fiber transmission line 1a and converted into a radio signal 103a by the optical receiver 12a and emitted from an antenna 71a and received by a mobile terminal equipment 3. |
