Compact optical transceiver module
An optical transceiver includes a substrate having first and second sides. A light emitter mounted to the first side. A light receiver is mounted to the first side and comprises a dielectric totally internally reflecting concentrator directing light to a photodetector. Amplification circuits are mounted to the second side and are electrically connected to the light emitter and the light receiver through the substrate. The light emitter and the light receiver are housed in separate molded housings. A DTIRC is used to provide a good link distance and a wide field of view.
1 . An optical transceiver comprising:
a substrate having first and second sides;
a light emitter mounted to the first side;
a light receiver mounted to the first side; and
amplification circuits mounted to the second side and electrically connected to the light emitter and the light receiver through the substrate.
2 . The optical transceiver of claim 1 , wherein the light receiver comprises a dielectric totally internally reflecting concentrator directing light to a photodetector.
3 . The optical transceiver of claim 1 , wherein the light emitter and the light receiver are housed in separate molded housings
4 . The optical transceiver of claim 2 , wherein the photodetector is a photodiode.
5 . The optical transceiver of claim 2 , wherein the photodetector is a phototransistor.
6 . The optical transceiver of claim 2 , wherein the photodetector is mounted to a leadframe enclosed within the light receiver, the leadframe electrically connecting the photodetector to an electrical terminal passing through the substrate, the electrical terminal electrically connecting the amplification circuits to the light emitter and the light receiver.
7 . The optical transceiver of claim 1 , wherein the light emitter comprises a hemispherical concentrator directing light from an LED.
8 . The optical transceiver of claim 1 , wherein the light emitter includes an LED.
9 . The optical transceiver of claim 8 , wherein the LED is mounted to a leadframe enclosed within the light emitter, the leadframe electrically connecting the LED to an electrical terminal passing through the substrate, the electrical terminal electrically connecting the amplification circuits to the light emitter and the light receiver.
10 . The optical transceiver of claim 1 , wherein the substrate comprises at least one electrical terminal passing through the substrate and electrically connecting the amplification circuits to the light emitter and the light receiver.
11 . The optical transceiver of claim 1 , wherein the substrate is an organic substrate.
12 . The optical transceiver of claim 1 , wherein the substrate is a ceramic substrate.
13 . The optical transceiver of claim 1 , wherein the amplification circuits are fabricated on an integrated circuit.
14 . The optical transceiver of claim 11 , wherein the integrated circuit is a flip-chip.
15 . The optical transceiver of claim 10 , wherein the amplification circuits are fabricated on an integrated circuit wire-bonded to the electrical terminal.
16 . The optical transceiver of claim 15 , further comprising epoxy encapsulating the integrated circuit and wire-bonds.
17 . The optical transceiver of claim 1 , wherein the light emitter emits infrared light, the light receiver receives infrared light and the amplification circuits amplify infrared light received by the light receiver and emitted by the light emitter.
18 . The optical transceiver of claim 1 , wherein the light emitter and light receiver are mounted to the first side using a pick and place machine and reflow process.
19 . A method of manufacturing an optical transceiver comprising the steps of:
mounting amplification circuits to a second side of a substrate having at least one electrical terminal passing through the substrate; and
mounting a light emitter and a light receiver to a first side of the substrate using an SMT process so that they are electrically connected to the amplification circuits through at least one of the electrical terminals.
20 . The method of claim 19 , wherein the light receiver comprises a dielectric totally internally reflecting concentrator directing light to a photodetector.
21 . The method of claim 20 , wherein the photodetector is a photodiode.
22 . The method of claim 20 , wherein the photodetector is a phototransistor.
23 . The method of claim 20 , further comprising the steps of:
mounting the photodetector to a leadframe;
enclosing the leadframe within the light receiver;
electrically connecting the photodetector through the leadframe to an electrical terminal passing through the substrate; and
electrically connecting the amplification circuits through the leadframe to the light emitter and the light receiver.
24 . The method of claim 19 , wherein the light emitter comprises a hemispherical concentrator directing light from an LED.
25 . The method of claim 19 , wherein the light emitter includes an LED.
26 . The method of claim 25 , further comprising the steps of:
mounting the LED to a leadframe;
enclosing the leadframe within the light receiver;
electrically connecting the LED through the leadframe to an electrical terminal passing through the substrate; and
electrically connecting the amplification circuits through the leadframe to the light emitter and the light receiver.
27 . The method of claim 19 , wherein the substrate is an organic substrate.
28 . The method of claim 19 , wherein the substrate is a ceramic substrate.
29 . The method of claim 19 , wherein the amplification circuits are fabricated on an integrated circuit.
30 . The method of claim 29 , wherein the integrated circuit is a flip-chip.
31 . The method of claim 29 , further comprising the step of wire-bonding the integrated circuit to the electrical terminal.
32 . The method of claim 31 , further comprising the step of encapsulating the amplification circuits and wire-bonds with epoxy.
33 . The method of claim 19 , wherein the step of mounting the light emitter and the light receiver to the first side of the substrate further comprises the step of using a pick and place machine and reflow process.