Two optical signals exchanging module structure in division wave multi-task system

The utility model relates to a two optical signals exchanging module structure in a division wave multi-task system, which uses a two sisters type multi-task optical signals exchanging module structure proposed by a port optical gyrator and a port optical switcher of an optical fibre grating 3, and can exchange signals among different routes in a dynamic state selection way. The structure can simultaneously exchange the optical signals of one to N channels without the processes of making optical signal multi-task and unmaking the optical signal multi-task. The dynamic state type optical signals exchanging module has the advantages of low overhearing, low insertion loss, good optical spectrum evenness degree, low cost, etc., and can enhance the viability and the scale of an elastic property expansion system in the division wave multi-task system. The utility model is good for the upgrade of a network and is good for increasing the attached application value of the network.