| 摘要 |
An optical micro cell transmission system comprising a radio base station, at least one optical interface section connected to the radio base station, and an optical forward base station connected to the optical interface section via optical fibers for transmitting and receiving signals through an antenna, and being flexible for the variation of an amplifier due to a change in temperature or a change in the length of an optical segment, and also being available for detecting faults in the optical forward base station is provided. Pilot signal generators 30, 51 are provided for generating pilot signals. For a transmitted signal 11, a coupler 21 in the optical interface section convolutes a pilot signal PD, and a demodulator 48 in an optical forward base station detects the level of the pilot signal PD and controls a downward signal amplifier 42 according to the result of detection. For a received signal received by an antenna 6, a coupler 45 in the optical forward base station convolutes a pilot signal PU, a demodulator 27 in the optical interface section detects the level of the pilot signal PU and controls an upward signal amplifier 25 according to the result of detection. Furthermore, control signals and fault information signals are transmitted in a modulated signal for the pilot signals PD, PU.
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