  Low crosstalk intersections formed by two crossing coupled cavity waveguides
(CCWs), which are formed by series of \textit{mono-mode} cavities in a two
dimensional photonic crystal structure, are investigated. Although the
individual cavities are \textit{mono-mode}, the modes of the properly designed
CCWs (which are called \textit{supermodes} in this paper) may be dipole-like,
and antisymmetry along the axis of the other perpendicular CCW, which ensures
the low crosstalk of the intersections. According to the results of coupled
mode analysis, we divide the intersections into two kinds based on the number
of cavities of each CCW, and the transmission and crosstalk spectra of both
kinds are numerically obtained using finite difference time domain (FDTD)
method. The results show that crosstalk power is lower than -30dB. We also
discuss the factors that affect the performance of the intersections.
