200 Gbps per wavelength 3R C-band History of engineering & technology InGaAs/GaAsP quantum well PON Technology: general issues adjacent channel power ratio chromatic dispersion compensation digital predistortion direct detection dynamic traffic error vector magnitude heuristics localization potential magnitude selective affine misorientation network design neural network on-off keying optical communication optical interconnects optical properties pulse amplitude modulation radio over fiber regenerator regenerator placement sparse regeneration translucent optical networks