I asked about this before but did not receive a response.

Crypto mining is huge. Nvidia (NVDA) has risen >100% in roughly 1 year (from $99 to $236). They sell GPUs/graphic cards which is one method of mining crypto (these cards have been sold out continuously and the prices are more expensive than ever).

Another method of mining is ASIC which POET mention in their Jan 29, 2018 NR, "As the need for higher data transfer speeds at greater baud rates and lower power levels increase, optics will move increasingly closer to the source of the data, whether it be a processor, application specific integrated circuit (ASIC) or field programmable gate array (FPGA). POET’s Optical Interposer Platform enables an optoelectronic interconnect fabric to interface directly with the source of data to support high-speed optical data transfer from within the Multi-Chip Module (MCM)."