Pertains to optical circuit boards possessing all of the following general features: - transmit patterns with straight, cross, bending optical paths and input and output optical ports in plane; - optical paths consisting of optical fibres and/or optical waveguides; - controlled lengths of the optical paths, if required; - may be combined with a printed electric circuit board, the functionality of which is outside the scope of this standard; - functions to interconnect between optical components and the ability to mount components.