MicroLED parallel optical interconnects
Parallel optical interconnects may be used to transmit signals produced by integrated circuits. A parallel optical interconnect may be in the form of a multicore optical fiber and one or more optical coupling assemblies optically connecting a first optical transceiver array and a second optical transceiver array. The multicore optical fiber may have multiple fiber elements with each having a core surrounded by cladding, and the one or more optical coupling assemblies may have refractive and/or reflective elements. In this way, light produced by one transceiver array may be transmitted through the multicore optical fiber and be received by the other transceiver array.
1. A parallel optical interconnect assembly for optically coupling integrated circuits, comprising:
a first optical transceiver array incorporated with a first integrated circuit, the first optical transceiver array having a first plurality of optical transmitters and a first plurality of optical receivers;
the first plurality of optical transmitters each having a drive circuit connected to a first microLED, each first microLED bonded to the first integrated circuit;
the first plurality of optical receivers each having a first photodetector connected to a receiver circuit, each first photodetector bonded to the first integrated circuit;
a multicore optical fiber configured to transmit light emitted by each first microLED of the first plurality of optical transmitters;
a first optical coupling assembly to couple light from each first microLED to a first end of the multicore optical fiber and light from the first end of the multicore optical fiber to each first photodetector, the first optical coupling assembly having a first refractive lens separated from the first optical transceiver array by a first distance equal to a first focal length of the first refractive lens, a second refractive lens separated from the first end of the multicore optical fiber by a second distance equal to a second focal length of the second refractive lens, with the first and second refractive lenses being separated from each other by a third distance equal to the first distance and the second distance combined;
a second optical transceiver array incorporated with a second integrated circuit, the second optical transceiver array having a second plurality of optical transmitters and a second plurality of optical receivers;
the second plurality of optical transmitters each having a drive circuit connected to a second microLED, each second microLED bonded to the second integrated circuit;
each of the second plurality of optical receivers having a second photodetector connected to a receiver circuit, each second photodetector bonded to the second integrated circuit; and
a second optical coupling assembly to couple light from each second microLED to a second end of the multicore optical fiber and light from the second end of the multicore optical fiber to each second photodetector;
wherein each first microLED of the first plurality of optical transmitters and each second photodetector of the second plurality of optical receivers are coupled to multiple cores of the multicore optical fiber.
2. The parallel optical interconnect assembly of claim 1 , wherein the first optical coupling assembly further comprises a reflecting element between the first optical transceiver array and the first refractive lens.
3. The parallel optical interconnect assembly of claim 2 , wherein the reflecting element is a turning mirror orientated 45 degrees relative to a normal axis of each first microLED of the first plurality of optical transmitters.
4. The parallel optical interconnect assembly of claim 1 , wherein the multicore optical fiber comprises at least two segments that are joined by a junction.
5. The parallel optical interconnect assembly of claim 4 , wherein the junction comprises an optical connector and a connector sleeve.
6. The parallel optical interconnect assembly of claim 1 , wherein the multicore optical fiber comprises a bundle of multiple fiber elements, each fiber element having a core surrounded by cladding.
7. The parallel optical interconnect assembly of claim 1 , wherein the multicore optical fiber comprises a bundle of multiple fiber elements, each fiber element having a core surrounded by a concentric cladding.
8. The parallel optical interconnect assembly of claim 7 , wherein a space between the multiple fiber elements contains a filler material.
9. The parallel optical interconnect assembly of claim 7 , wherein a space between the multiple fiber elements is empty.