The invention relates to the technical field of
train communication, in particular to an
optical fiber digital
repeater which comprises a near-end
machine and a far-end
machine, the near-end
machine and the far-end machine are connected through an
optical fiber, and the far-end machine comprises a far-end machine digital board, a
multiplexer, a 3dB bridge, a main power
amplifier, a
standby power amplifier, a
radio frequency switch and a same and different frequency control module. The far-end machine digital board is electrically connected with the 3dB bridge, the main power
amplifier and the
standby power amplifier are both electrically connected with the 3dB bridge, and the main power amplifier and the
standby power amplifier are both electrically connected with the 3dB bridge. The same and different frequency control module is added in the far-end machine, so that the digital
repeater has 450M same and different frequency work and is compatible with 400M and 450M simultaneous work; the 400M
train digital
wireless dispatching communication
system and the 450M analog
wireless train dispatching
system can work at the same time, the application requirement of the DRTD
system is met, and train communication can be guaranteed in the
transition stage of the train communication system from the current 450M analog
wireless train dispatching system to the 400M digital wireless dispatching system.