Proposed was a novel time domain wavelength interleaved passive optical access network architecture and its basic working principles were described. A system implementation method was also proposed to improve the physical layer security and reduce the ONU power consumption. Based on this architecture, a proof-of-concept simulation was carried out for a two-channel, 1.25Gb/s optical system. The results verify that the proposed architecture can realize error-free transmission over 20km to satisfy the demand of optical access network, with the physical layer security and power saving guaranteed.