Multi-backup OTDR optical amplification device with shared light source and control method

The invention provides a multi-backup OTDR optical amplification device with a shared light source. The device comprises a pump laser combination unit composed of a main control unit, a data collecting and processing unit, a laser control driving unit and N pump lasers, an optical switch control matrix, N*1 optical switches, an optical circulator, an output optical switch and a pump combiner MUX; N 1*2 optical switches are arranged in the optical switch control matrix; N is not smaller than 2; the laser control driving unit comprises a mode selection switch matrix and a laser control driving matrix; N driving units are arranged in the laser control driving matrix; the main control unit is connected with and controls the mode selection switch matrix; the driving units in the laser control driving matrix are separately connected with the corresponding pump lasers in the pump laser combination unit; and the multi-backup OTDR optical amplification device provided by the invention shares the pump lasers to achieve