Dual-channel backup optical receiver for fiber-optic transmission system

The utility model relates to a dual-channel backup optical receiver for a fiber-optic transmission system. Due to a built-in channel switching unit, a single optical receiver can realize the dual-channel backup receiving function; as a result of the combination of an optical AGC control mode and an electric AGC control mode, the utility model can ensure that the output level is constant when signals with different degrees of light modulation from different optical power transmitters during channel switching or signal jumping, thereby realizing high-quality reception of the dual-channel optical power backup; due to the combination of an active DC control mode and a passive DC control mode, the utility model solves the problem of interference between signals of a first channel and a second channel and achieves the purpose of energy conservation; the arrangement of a mode selection switch and a channel selection switch facilitates manual control; the arrangement of a display unit facilitates the observation of the equipment operating state and the channel state; and a computer processing unit consists of two microprocessors, thereby making the design logic clear.