Electrical design of high-speed electro-optically modulated coupled-cavity VCSELs

We present an equivalent circuit cut-off frequency analysis of a Coupled-Cavity Vertical-Cavity Surface-Emitting Laser with one cavity used as a fast electro-optic modulator with lumped electrodes. We find that the mesa capacitance and the polyimide capacitance and series resistance are the most influencing parameters. In order to enhance the -3 dB bandwidth the design steps should be: reduction of the contact pad area and modulator mesa radius together with increasing the modulator cavity length, as well as implementing a pnp structure. Based on the model, we suggest a realistic structure that is theoretically able to achieve about 100 GHz modulation speed.

Jaar van publicatie:2011

Trefwoorden:SURFACE-EMITTING LASERS; ERROR-FREE OPERATION, SEMICONDUCTOR MICROCAVITY; HIGH-EFFICIENCY;, 25 GBIT/S; BANDWIDTH; EMISSION; DIODE, Computerwetenschappen en informatietechnologie, Elektronica en elektrotechniek, Klassieke natuurkunde