consisting of a high speed led 146 and an oscillator 147 distribute the pulses 143 on a modified cover glass layer down through optical vias 144 by reflection off of angled mirrors 141 to light sensitive pin diodes 142 from which local clocks 145 distribute the resulting electrical pulses reference is now made to fig1 such a structure can be most economically produced by constructing the special cover glass layer 151 on the top of the integrated circuit chip 150 and mounting the led oscillator chip 152 directly on top of the existing ic aligning the chip to existing power and ground pads placed specifically for the optical clock generator reference is now made to fig1 the h tree layout technique mentioned above may be employed to distribute the optical signal from the optical clock generator chip 152 mounted in the center of the ic 150 through four balanced h tree structures 160 which split the light pulses reflecting them with angled edges 162 to the regularly placed light vias 161 with equal distances from the optical clock generator chip 152 to each of the light vias 161 since the light pulses are not delayed by variations in the metal capacitance the equal distance h tree routing minimizes the resulting skew much more effectively than with electrical signals so in yet another embodiment of the present invention an optical clock distribution system may be used to distribute the clock to the registers which capture the results from the differential receivers.