Modulating individual lines is the only way for such a scheme to become practical in a real environment and achieve the claimed data rates. Making hundreds of m

Modulating individual lines is the only way for such a scheme to become practical in a real environment and achieve the claimed data rates. Making hundreds of modulators and receivers fit within a single chip is about as hard as making hundreds of laser fit a single chip, hence why it's not realistically being pursued by the industry. My point is that if you already require separate chips for the rest of the transceiver, integrating the laser itself becomes much less of an issue, and the benefits of a single laser source common to all much more muted.