ATTACHMENT OF OPTOELECTRONIC COMPONENTS TO SILICON SUBMOUNTS BY ND-YAG LASER SOLDERING OF INDIUM

A fluxless soldering technique has been developed for the attachment of optoelectronic components to silicon submounts by laser soldering of gold-coated indium solder pads. By keeping the solder time per pad at 60 msec, and by adhering to a solder schedule that minimizes the formation of indium oxide, it is possible to solder without flux or the need of an inert atmosphere. The method is demonstrated on a high speed data link consisting of a laser, an external modulator, and a laser back facet detector attached to a silicon submount.