In contrast to electrical testing, where basically a simple connection of conductors is needed, delivering and receiving light is not quite simple. Twan Korthorst, Director of Synopsys Photonic Solutions, said to the magazine:
-“This requires very tight alignment of optical probes to couple light into the chip to power up the circuit — and then either read out electrical signals with traditional electrical probes, or couple light out of the chip.”
Bryon Moyer, author of the article compiled a series of statements from different thought leaders on the field of PICs on a well written article comprising the current status and requirements for Photonic IC testing.
“As silicon photonics costs come down, the technology is being worked into new applications, from connectivity to AI. But full commercial production requires testing those photonic circuits before shipping them.
At a high level, photonics testing should be the same as electrical testing. Signals go in, get processed, and then the outgoing signals are evaluated. But below that level, testing with light is very different from testing with electrons”.
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