Multiple-route light signal exchange and switchover system

The utility model discloses a multi-link optical signal cross-connect and switching system. An optical cross-connect module structure which comprises three or four fiber links is provided by using of fiber bragg gratings, an optical circulator and optical switches, and optical signals between different fiber links can be cross connected dynamically and selectively on optical networks. The structure can simultaneously cross-connect optical signals from one to N channels without steps of signal multiplexing and demultiplexing. The dynamic optical signal cross-connect module has the advantages of low overhearing, low insertion loss, good spectrum flatness and low cost. The utility model can improve the survival of a wavelength division multiplexing network, flexibly expand the scale of the system, facilitate network upgrade and increase additional application values of networks and substitute the N by N space division switch.