Longitudinal-Mode Photon-Photon Resonances in Multiple-Cavity Distributed-Feedback Lasers and Vertical-Cavity Surface-Emitting Lasers

Both Distributed-Feedback and Vertical-Cavity Surface-Emitting Lasers with 2 cavities generate 2 longitudinal modes, with design-tunable frequency separations through 100's of Gigahertz for modulation-speed enhancement via photonphoton resonance. Optical 2-cavity designs are presented, targeting data rates > 200-400 Gigabits/second non-return-to-zero, and twice those via pulse amplitude modulation-4.