A multilayer printed circuit board including insulating layers, conductor circuits formed between the insulating layers, and optical circuits formed between the insulating layers and including a first optical circuit. The first optical circuit is positioned on a first outermost insulating layer of the insulating layers, and the insulating layers, conductor circuits and optical circuits are layered to form a multilayer structure having a first surface and a second surface on an opposite side of the first surface such that the multilayer structure is structured to mount optical elements on the first surface and second surface of the multilayer structure, respectively.