A low crosstalk structure is proposed and analyzed for the integrative optical add and drop multiplexer/optical cross-connect node (OADM/OXC) that implements the function of the OADM and the OXC simultaneously in wavelength division multiplexing (WDM) optical transport networks. For joined adding and dropping, a set of 1×2 and 2×1 switches are placed before the cross-connect switches instead of using larger dimensional cross-connect array. Simulation result shows that the power penalty can be decreased significantly in the proposed structure.