It is not meaningful to suggest this is a small percentage of the total power used by the data center therefore the savings are irrelevant.

What matters is whether or not the technology can save enough power to offset its cost and what the net present value of investing in the use of the POET VCSEL versus running copper.

It is mostly about the dollars and cents and to some extent the green factor of consuming less - 1% less or 15% less or whatever the number is a good thing.