Patent ID: 7044659

Claim:
A method for producing an optical communications module, the method comprising the steps of: (a) producing an Si wafer on which a multitude of segments to be used as substrate chips for optical communications are provided; each of the segments being provided with: (a1) one component selected from the group consisting of at least one V-shaped groove and at least one optical waveguide; and (a2) a plurality of metallized patterns formed by one method selected from the group consisting of evaporation, etching, and printing; (b) cutting the Si wafer into individual chips to obtain Si substrates for optical communications; (c) mounting onto one of the Si substrates one member selected from the group consisting of a pair of a signal-transmitting section and a signal-receiving section, a plurality of signal-transmitting sections, a plurality of signal-receiving sections, and a plurality of pairs of a signal-transmitting section and a signal-receiving section; (d) bonding an insulating substrate to the back face of the Si substrate; and (e) providing a separating groove that separates the Si substrate along the or each boundary line between the sections constituting the selected member in order to prevent the electrical crosstalk through the Si substrate, the separating groove being provided from the top surface of the Si substrate to some midpoint of the insulating substrate.