Optoelectronic modules including an optical emitter and optical receiver

A method comprising:

• replicating optical elements onto respective surfaces of a plurality of light emitting dies operable to emit light having a wavelength and onto respective surfaces of a plurality of light receiver dies operable to detect light having the wavelength, wherein the optical elements are composed of a first epoxy, and wherein the plurality of light emitting dies and the plurality of light receiver dies are mounted on a PCB wafer attached by a double-sided adhesive tape to a support glass;
• injecting a second epoxy using a vacuum injection molding technique, wherein the second epoxy is substantially opaque to light having the wavelength, and wherein the second epoxy is injected such that it laterally surrounds and is in contact with respective side surfaces of each of the plurality of light emitting dies, each of the plurality of light receiver dies and each of the optical elements;
• forming respective trenches in the second epoxy in regions separating duplex pairs of the light emitting dies and the light receiver dies from one another, wherein each duplex pair includes one of the light emitting dies and one of the light receiver dies, and wherein the trenches partially extend into the PCB wafer, and forming additional trenches that extend through the second epoxy and through the PCB wafer, wherein the additional trenches are formed prior to detaching the double-sided adhesive tape and the support glass from the PCB wafer;
• detaching the double-sided adhesive tape and the support glass from the PCB wafer;
• separating the PCB wafer at locations of the trenches to form singulated modules each of which includes at least one of the light emitting dies and at least one of the light receiver dies;
• and
• applying an IR coating over at least an exposed surface of one or more of the singulated modules, wherein the IR coating serves as an optical filter to allow only radiation in the IR part of the electromagnetic spectrum to pass.