Parallel optical communication channels using microLEDs
Coupling of light from large angular distribution microLEDs into smaller angular acceptance distribution of transmission channels is performed using optical elements.
1. Optical communication apparatus for an optically interconnected integrated circuit which includes circuitry for performing logic functions, comprising:
an array of microLEDs;
optical transmission channels, comprising a multicore fiber, to receive light from the array of microLEDs at optical transmission channel inputs and output light at optical transmission channel outputs, wherein a number of cores in the multicore fiber is different than a number of microLEDs in the array of microLEDs, wherein each optical transmission channel comprises multiple cores of the multicore fiber that are made from a rigid material, and wherein each microLED in the array of microLEDs is configured to produce light to be carried in a plurality of cores of the multiple cores of the multicore fiber in the optical transmission channels;
optical elements, including at least one lens, between the array of microLEDs and the optical transmission channel inputs to magnify and focus light from the array of microLEDs onto the optical transmission channel inputs; and
an array of optoelectronic receivers, wherein each optoelectronic receiver is optically coupled to receive light from one optical transmission channel output of the optical transmission channels.
2. The optical communication apparatus of claim 1 , wherein the optical elements include a first lens to collimate light from the array of microLEDs and a second lens to focus the collimated light onto the optical transmission channel inputs, the second lens having a longer focal length than the first lens.
3. The optical communication apparatus of claim 2 , further comprising a planar mirror optically between the first lens and the second lens.
4. The optical communication apparatus of claim 1 , wherein the optical elements include a first lens to collimate light from the array of microLEDs and a curved folding mirror to focus the collimated light onto the optical transmission channel inputs and fold the light by ninety degrees.
5. The optical communication apparatus of claim 1 , further comprising a reflector for each microLED in the array of microLEDs to direct light to the optical elements.