Photonic communication platform and related methods for increasing yield
Photonic interposers that enable low-power, high-bandwidth inter-chip (e.g., board-level and/or rack-level) as well as intra-chip communication are described. Described herein are techniques, architectures and processes that improve upon the performance of conventional computers. Some embodiments provide photonic interposers that use photonic tiles, where each tile includes programmable photonic circuits that can be programmed based on the needs of a particular computer architecture. Some tiles are instantiations of a common template tile that are stitched together in a 1D or a 2D arrangement. Some embodiments described herein provide a programmable physical network designed to connect pairs of tiles together with photonic links.
1. A photonic device, comprising:
a photonic circuit;
a plurality of optical channels having a plurality of chip-to-fiber couplers and a plurality of waveguides coupled to respective chip-to-fiber couplers;
an optical switch coupled between the plurality of optical channels and the photonic circuit; and
a controller configured to:
determine information indicative of a performance associated with each of the plurality of optical channels;
identify a subset of the plurality of optical channels using the information indicative of the performance associated with each of the plurality of optical channels; and
control the optical switch to selectively couple the subset of the plurality of optical channels to the photonic circuit.
2. The photonic device of claim 1 , wherein the plurality of optical channels further comprise a plurality of photodetectors coupled to respective waveguides, and wherein determining the information indicative of the performance associated with each of the plurality of optical channels comprises determining an output of each of the plurality of photodetectors.
3. The photonic device of claim 2 , wherein the plurality of photodetectors are coupled to the respective waveguides via tap couplers.
4. The photonic device of claim 1 , wherein determining information indicative of the performance associated with each of the plurality of optical channels comprises determining a bit error rate (BER) associated with each of the plurality of optical channels.
5. The photonic device of claim 1 , wherein the photonic circuit comprises a plurality of tiles that are patterned in accordance with a template tile, wherein each tile comprises:
a transmitter;
a receiver;
a network of programmable optical connections; and
electrical connections configured for vertical die-to-die connection with an electronic chip, the electrical connections being coupled to the transmitter, the receiver and the network of programmable optical connections.
6. The photonic device of claim 1 , wherein identifying the subset of the plurality of optical channels using the information comprises identifying the subset of the plurality of optical channels exhibiting best performance among the optical channels.
7. The photonic device of claim 1 , wherein the chip-to-fiber couplers comprise edge couplers or grating couplers.
8. The photonic device of claim 1 , wherein the controller is further configured to control the photonic circuit to transmit data outside the photonic device using the subset of the plurality of optical channels selected by the optical switch.
9. A method for transmitting data using a photonic device comprising an optical switch and a plurality of optical channels having a plurality of chip-to-fiber couplers and a plurality of waveguides coupled to respective chip-to-fiber couplers, the method comprising:
determining information indicative of a performance associated with each of the plurality of optical channels;
identifying a subset of the plurality of optical channels using the information indicative of the performance associated with each of the plurality of optical channels;
controlling the optical switch to select the subset of the plurality of optical channels, and
transmitting the data outside the photonic device using the subset of the plurality of optical channels selected by the optical switch.
10. The method of claim 9 , wherein the plurality of optical channels further comprise a plurality of photodetectors coupled to respective waveguides, and wherein determining the information indicative of the performance associated with each of the plurality of optical channels comprises determining an output of each of the plurality of photodetectors.
11. The method of claim 9 , wherein determining information indicative of the performance associated with each of the plurality of optical channels comprises determining a bit error rate (BER) associated with each of the plurality of optical channels.
12. The method of claim 9 , wherein identifying the subset of the plurality of optical channels using the information comprises identifying the subset of the plurality of optical channels exhibiting best performance among the optical channels.
13. A photonic interposer, comprising:
a plurality of photonic tiles including a redundant tile, each photonic tile comprising:
a transmitter;
a receiver;
a network of programmable optical connections;
electrical connections configured for vertical die-to-die connection with an electronic chip, the electrical connections being coupled to the transmitter, the receiver and the network of programmable optical connections;
a monitoring photodetector; and
a controller configured to:
determine information indicative of a performance of each of the plurality of photonic tiles using an output of the respective monitoring photodetector;
identify, among the plurality of tiles, a defective tile using the information indicative of the performance of each of the plurality of photonic tiles; and
functionally swap the defective tile with the redundant tile.
14. The photonic interposer of claim 13 , wherein functionally swapping the defective tile with the redundant tile comprises redirecting, to the redundant tile, data directed to the defective tile.
15. The photonic interposer of claim 14 , wherein redirecting the data comprises programming the network of programmable optical connections.