Optical amplification device comprising: • at least one input optical fiber arranged within a first element (20; 20A, 20B) and intended to receive an input optical signal, • at least one output optical fiber arranged within a second element (24; 24A, 24B) and intended to provide an output optical signal, • at least one set (10; 10A, 10B) of at least two amplifier modules (12, 12A), the or each set (10; 10A, 10B) of amplifier modules (12, 12A) being arranged within a third element (28; 28A, 28B), each amplifier module (12, 12A) comprising at least one semiconductor optical amplifier (14, 14A), the or each third element (28; 28A, 28B) being arranged between the or one of the first element(s) (20; 20A, 20B) and the or one of the second element(s) (24; 24A, 24B) so that, in a first configuration of the device, at least one amplifier module of the set (10; 10A, 10B) arranged within said third element is on the optical path of one input optical fiber and one output optical fiber, • means for monitoring the state of each semiconductor optical amplifier (14, 14A), said means being configured to detect a default or failure of said semiconductor optical amplifier, • means for mechanically moving the device from the first configuration to at least one second configuration, said moving means being connected to the monitoring means so that the moving means are adapted to move the device from the first configuration to the second configuration upon receipt of a default or failure detection signal of one of the semiconductor optical amplifiers (14, 14A), the device being configured so that, in the or each second configuration, for the or one of the third element(s) (28; 28A, 28B) associated to one set of amplifier modules (12, 12A), no more optical signal is injected within the amplifier module comprising the default or failed semiconductor optical amplifier (14, 14A); wherein the or each third element (28; 28A, 28B) is fixed permanently and the or each second element (24; 24A, 24B) is a rotating element mounted around a rotation axis, the moving means being configured to drive the or each second element (24; 24A, 24B) around its rotation axis. • at least one input optical fiber arranged within a first element (20; 20A, 20B) and intended to receive an input optical signal, • at least one output optical fiber arranged within a second element (24; 24A, 24B) and intended to provide an output optical signal, • at least one set (10; 10A, 10B) of at least two amplifier modules (12, 12A), the or each set (10; 10A, 10B) of amplifier modules (12, 12A) being arranged within a third element (28; 28A, 28B), each amplifier module (12, 12A) comprising at least one semiconductor optical amplifier (14, 14A), the or each third element (28; 28A, 28B) being arranged between the or one of the first element(s) (20; 20A, 20B) and the or one of the second element(s) (24; 24A, 24B) so that, in a first configuration of the device, at least one amplifier module of the set (10; 10A, 10B) arranged within said third element is on the optical path of one input optical fiber and one output optical fiber, • means for monitoring the state of each semiconductor optical amplifier (14, 14A), said means being configured to detect a default or failure of said semiconductor optical amplifier, • means for mechanically moving the device from the first configuration to at least one second configuration, said moving means being connected to the monitoring means so that the moving means are adapted to move the device from the first configuration to the second configuration upon receipt of a default or failure detection signal of one of the semiconductor optical amplifiers (14, 14A),