Counterpoint Research published a worthwhile piece on the reported U.S. restrictions on imports of Chinese optical modules.
"In an AI supercluster, a missing batch of optical transceivers renders billion-dollar GPU allocations idle. Constraining transceiver imports risks delaying the commercial turn-up of next-generation 800G/1.6T clusters by multiple quarters."
The US restriction on imports of Chinese optical transceivers is nothing short of self inflicted damage. US data centers will literally grind to a halt.