Burst type ultralong distance optical fiber protectors based on SOA optical switch

The invention provides a burst-type super-long distance optical fiber protector based on an SOA optical switch, which comprises an optical line terminal interface, an optical splitter, the SOA optical switch and a main fiber interface which are connected in sequence, wherein the optical splitter is connected with a light detector and a control logic circuit in sequence; and the control logic circuit is further connected with the SOA optical switch. The optical fiber protector is compatible with all PON systems, enlarges the transmission distance and the branching ratio of the PON systems, and realizes the automatic optical fiber protection switching of a PON network.