Abstract: A new multidimensional OCDMA address code is presented. It is based on one dimension ST-OOC by adding polarimeter/depolarimeter respectively to the encoder/decoder to get multidimensional optical CDMA address code. From theoretical analysis, the number of address code can be increased to n times through n polarization directions in one-dimension system. The numerical analysis shows that, in two-dimensional OCDMA system combining ST-OOC and two polarization directions, the proposed coding method can increase the number of simultaneous users, reduce the multi-user interference effectively, and make an efficient reduction of the number of coders and decoders needed.