High Speed Single-Mode Surface-Emitting DFB Laser

High speed single mode surface emitting distributed feedback laser at 850nm has been presented. The equivalent circuit model of the surface emitting DFB laser is established, and the effect of parasitic parameters on the high speed modulation characteristics of the device is analyzed and calculated. The simulation results show that the parasitic bandwidth is the main factor affecting the total modulation bandwidth. The 3 dB parasitic frequency can be increased from 4 GHz to 29.79 GHz by optimization, and the total modulation bandwidth can be increased to 24.6 GHz.