Bit-wise inverse multiplexing for optical channels utilizing microLEDs
An optical communication system may include microLEDs for use in communicating data between chips or multi-chip modules. The number of microLEDs may be greater than a number of electrical data lines for carrying data to be communicated. Signals on the electrical data lines may be inverse multiplexed, for example to allow for operation of the microLEDs at a rate slower than operation of electrical circuitry generating signals on the electrical data lines.
1. A method of providing inverse-multiplexed optical data transmission, comprising:
demultiplexing each of a plurality of serial input electrical data signals for transmission to form a plurality of parallel input electrical data signals, with corresponding parallel input electrical data signals for each of the serial input data signals;
driving microLEDs of an array of microLEDs to emit light based on the parallel input electrical data signals;
passing the light through cores of a multicore fiber, with light from different microLEDs passing through different cores of the multicore fiber;
forming parallel output electrical data signals by an array of photodetectors receiving the light passed through the cores of the multicore fiber; and
multiplexing the parallel output electrical data signals to form serial output electrical data signals;
wherein the array of microLEDs comprises a plurality of sub-arrays of microLEDs, and each of the corresponding parallel input electrical data signals are provided to different ones of the sub-arrays of microLEDs;
wherein the array of photodetectors comprises a plurality of sub-arrays of photodetectors, and each of the sub-arrays of photodetectors receives light emitted by a corresponding one of the sub-arrays of microLEDs; and
wherein the array of photodetectors comprises a plurality of sub-arrays of photodetectors, and each of the sub-arrays of photodetectors receives light emitted by a corresponding one of the sub-arrays of microLEDs; and
further comprising, for each sub-array of microLEDs, driving a microLED of the array of microLEDs with an input electrical clock signal, passing light emitted by the at least one microLED driven by the input electrical clock signal through at least one core of the multicore fiber, and forming an output electrical clock signal by at least one photodetector of a corresponding one of the sub-arrays of photodetectors.
2. The method of claim 1 , further comprising, for each sub-array of microLEDs, latching the parallel input electrical data signals using the input electrical clock signal, and for the corresponding one of the sub-arrays of photodetectors, latching the parallel output electrical data signals using the output electrical clock signal.
3. The method of claim 1 , wherein different photodetectors of one of the sub-arrays of photodetectors receives light emitted by a corresponding different one of the microLEDs of the corresponding one of the sub-arrays of microLEDs.
4. A method of providing inverse-multiplexed optical data transmission, comprising:
demultiplexing each of a plurality of serial input electrical data signals for transmission to form a plurality of parallel input electrical data signals, with corresponding parallel input electrical data signals for each of the serial input data signals;
driving microLEDs of an array of microLEDs to emit light based on the parallel input electrical data signals;
passing the light through cores of a multicore fiber, with light from different microLEDs passing through different cores of the multicore fiber;
forming parallel output electrical data signals by an array of photodetectors receiving the light passed through the cores of the multicore fiber; and
multiplexing the parallel output electrical data signals to form serial output electrical data signals further comprising driving at least one microLED of the array of microLEDs with an input electrical clock signal, passing light emitted by the at least one microLED driven by the input electrical clock signal through at least one core of the multicore fiber, and forming an output electrical clock signal by at least one photodetector of the array of photodetectors.
5. The method of claim 4 , further comprising latching at least one of the parallel input electrical data signals using the input electrical clock signal, and latching at least one of the parallel output electrical data signals using the output electrical clock signal.
6. An optical communication apparatus for transmitting inverse-multiplexed data, comprising:
an inverse multiplexer having an input for one or more serial input electrical signals and configured to produce parallel input electrical signals;
transmitter circuitry configured to receive the parallel input electrical signals and drive microLEDs to produce parallel optical signals;
a first optical coupling assembly to couple light from the microLEDs to a first end of a multicore fiber;
a second optical coupling assembly to couple light from a second end of the multicore fiber to photodetectors to produce parallel output electrical signals; and
a multiplexer having a plurality of inputs configured to receive the parallel output electrical signals and convert the parallel output electrical signals to serial output electrical signals; and
further comprising:
an error-correcting code (ECC) encoder, the ECC encoder configured to generate error correction electrical signals based on the parallel input electrical signals, and wherein the transmitter circuitry is further configured to receive the error correction electrical signals and drive additional microLEDs to produce error correction optical signals, and wherein the parallel optical signals include the error correction optical signals; and
an ECC decoder, the ECC decoder configured to correct errors in the parallel output electrical signals.
7. The optical communication apparatus of claim 6 , further comprising a latch to latch the parallel input electrical signals based on a clock signal.
8. The optical communication apparatus of claim 6 , wherein the inverse multiplexer is configured to produce the parallel input electrical signals bytewise.