Optical coupling for multi-layered optical printed wiring board using micro lens array

We proposed micro lens array coupling for multi-layered optical printed board. Optical coupling efficiency and optical positional tolerance of micro lens are discussed by ray trace simulation CAD. Polymer micro lens arrays can be fabricated easily by using UV curable resin. Our preliminary simulation indicated that four layers pitch of 125μm of optical printed wiring board is feasible for high coupling efficiency and high optical positional tolerance.