A multiple-core optical waveguide comprises: a substrate; lower and upper waveguide core layers; a waveguide core between the upper and lower waveguide core layers; upper and lower cladding; and middle cladding between the upper and lower waveguide core layers substantially surrounding the waveguide core. The tool has a portion with an air channel bore housing. The adapters being arranged in arrays that slide independently of other adapter arrays to provide access to the open rearward and open forward cable connections. In the present invention, an input signal is registered and shifted through specific couplings between foregoing units with two clock signals having different pulse durations.