Trans-Pacific :) But more seriously, this article is about the device-side electrical interfaces -- the modules will transceive on any one of a number of physi

Trans-Pacific :) But more seriously, this article is about the device-side electrical interfaces -- the modules will transceive on any one of a number of physical interfaces depending on the specific needs (ultra-short-range for in-rack/in-DC, though that's a less likely application of this technology). Most multi-lane paths like these are using multi-strand optical cabling for short-range, and typically multiplexing the signal using on-board DWDM in/around the 1550nm band for two-strand long-range (which is primarily constrained by the power available to the module). This band is used because it can also be amplified inline (ref: erbium-doped amplifier) to extend the range. (this is an oversimplification, I am not your network engineer, I am not a network engineer, consult a qualified network engineer in your jurisdiction)