The contribution of this paper is an all-optical 3D network architecture. We describe scheduled, two-phase routing for it. The three-dimensional blocked optical torus BOT of block size b consists of b² × b² × b² nodes for the first phase routing. Processors are evenly deployed at the underlying torus so that every b^th node consists of a processor. Additionally, a BOT consists of b³ blocks of b × b × b subnetworks for the second phase routing. Routing of each packet is done in two phases. Firstly, packets are routed from source processor to an intermediate target node at the target block. Secondly, packets are routed from the intermediate targets at the target block to the target processor (if necessary). Routing is based on wavelength-division multiplexing and scheduled transmissions.