Single quantum well LEDs are well-commercialized at 150 Mbps for MOST150 (that was intended to, running over POF, be cheaper than an ethernet PHY and copper); I

Single quantum well LEDs are well-commercialized at 150 Mbps for MOST150 (that was intended to, running over POF, be cheaper than an ethernet PHY and copper); I'm not sure exactly where SQW LEDs drop off and laser diodes become the only option, but it's substantially faster than traditional LEDs.