On-line testing device for space radiation resistance of batch gain fibers

The invention discloses an online testing device for space radiation resistance of batch gain fibers. The online testing device comprises a pump light source, a forward optical switch, gain fibers, a backward optical switch, a pump light filter, a beam splitter, a power meter, a spectrograph and an upper computer. Pump light is divided into N paths through the forward optical switch, and the N paths of pump light are injected into the N paths of gain optical fibers respectively and are connected to the pump light filter through the backward optical switch. After the pump light of the fiber laser is filtered by the pump light filter, the fiber laser is divided into two paths by the beam splitter, and the two paths are respectively connected to a power meter and a spectrograph; the upper computer is used for controlling selection and switching of optical switch channels, on-off of the optical fiber laser, and test data transmission of the power meter and the spectrograph. According to the invention, batch on-li