Zener tunnel-injection for Ge optical amplifiers, lasers and modulators (invited). 2017 IEEE 14th International Conference on Group IV Photonics (GFP), 11-12, August 2017. [PUMA: Absorption Doping Electroluminescence Gain Ge-SI Junctions Modulation Moss-Burstein Schulze Silicon Zener-emitter amplifier amplifiers characteristics electro-absorption electro-optical electroabsorption energy extinction gain gap generic germanium germanium-on-silicon iht indirect injection integrated lasers mechanism modulation optical optics photonic platform ratios semiconductor shift siliconsend:unibiblio]