Spin-dependent transport in a triple quantum dots superlattice system with a bridge coupling to two leads is studied. There exists an odd even parity oscillation of spin polarization at the central dot level cc = 0 due to the spin-dependent Fano and Dicke effects induced by the quantum interference and the Rashba spin^rbit interaction. In the case of even numbers of triple quantum dots, the device can be used as a spin switch by tuning the energy difference h between the energies of the central and the lateral dots. These results may be helpful to design and fabricate practical spintronic devices.
