A new two-dimensional (2D) optical orthogonal code (OOC) constructed using OOC for time spreading and one-coincidence sequence (OCS) for wavelength hopping named OOC/OCS is presented. Compared with other 2D OOC, the number of wavelengths for OOC/OCS is not limited to a prime number or its power. OOC/OCS can be constructed flexibly, and also can use available wavelengths adequately. Auto-correlation and cross-correlation performances of OOC/OCS are analyzed, and the mean value of cross-correlation is also deduced. In the end, the performance of OOC/OCS with different parameters is analyzed and discussed, according to different parameters of multi-wavelength optical code division multiple access (MW OCDMA) system. Given OCS and code weight w, bit error ratio (BER) of OCDMA system is decreased when code length L is increased. Given OOC and code length N, BER of OCDMA system is decreased when the number of wavelengths is increased.