Abstract: The optical cross connecter (OXC) plays an important role in dense wavelength division multiplexing (DWDM) network. A new OXC structure based on bidirectional optical circulators (OC) is proposed in this paper. Its basic structure, which called as 2×2 optical cross connecter, is composed of a fiber Bragg grating (FBG) and a bidirectional OC. Based on the basic structure, the required N×N OXC can be designed. In comparison with traditional schemes, the new scheme has several strong points, e.g. more simple and compact structure, smaller volume, lower cost and fewer number of OCs (67% less than the traditional structures). The simulation result shows that its insertion loss is much less than that of the conventional structure.