  This paper considers the transmission characteristics of incidenting from an
infinte coupled-resonator waveguide (CRW) or a semi-infinite CRW, respectively.
The Nth cavity of a semi-infinite CRW intersecting with an infinite CRW and a
cascade three level system(CTLS) form a T-bulge structure. Due to symmetry
breaking boundary, the maximum of transfer rate would reach unity when light
incidenting from the semi-infinite CRW, while reach 0.5 for infinite CRW case.
The position of the intersection have effect on the location of the extreme
point of the transmission coefficients changing with couple strength. 4D
figures are used to illustrate the transmission characteristics, which is more
visable.
