Self-aligned silicon carrier for optical device supporting wafer scale methods
View Patent ↗Disclosed is a carrier assembly for and a method of manufacturing an optical device. The method comprises providing a silicon substrate; attaching a number of optical dies on the silicon substrate to form an optical device carrier assembly; providing a corresponding number of through holes in the silicon substrate to permit the passage of light therethrough and further providing guide holes in the silicon substrate to present means for passive alignment of an external optical connection; and dicing the optical device carrier assembly to form individual optical devices. Preferably, the step of attaching a number of optical dies comprises using self-alignment of solder bumps using gaseous flux, the through holes are dry etched into the silicon substrate, and/or the volume between the optical die and silicon substrate is filled with a transparent polymer. Preferably, the transparent polymer is silicone rubber or epoxy. Preferably, the optical dies have a polymer mass to assist the heat transfer to the silicon substrate.
1. A method for manufacturing an optical device, the method comprising:
providing a silicon substrate; attaching a number of optical dies on the silicon substrate to form an optical device carrier assembly, wherein the step of attaching a number of optical dies comprises using self-alignment of solder bumps using gaseous flux; dry etching a corresponding number of through holes into the silicon substrate to permit the passage of light therethrough; dicing the optical device carrier assembly to form individual optical devices; and using the through holes as guide holes to permit passive fiber alignment of the optical carrier to an external optical element in use, wherein guide pins are used to align the through holes in the silicon substrate with corresponding guide holes in the external optical element; whereby the through holes serve to provide both optical transparency in the silicon substrate and serve to provide a micromechanical structure for passive fiber alignment.
2. The method of claim 1 , further comprising the step of filling the volume between the optical die and silicon substrate with a transparent polymer.
3. The method of claim 2 , wherein the transparent polymer is silicone rubber or epoxy.
4. The method of claim 1 , further comprising testing and burn in of the optical dies prior to the dicing step.
5. The method of claim 1 , further comprising providing the optical dies with a polymer mass to assist the heat transfer to the silicon substrate.
6. The method of claim 1 , further comprising providing a metal pattern on the silicon substrate and solder bumps on an epi side of each optical die, and wherein the step of mounting the optical dies to the substrate includes mating together the metal pattern and the solder bumps.