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We present a novel air-bridge subwavelength grating reflector with very high reflectivity to be used as a top mirror in a VCSEL structure. We explain the design method, model the structure using both RCWA and FDTD, and predict the characteristics of a Fabry-Perot structure built with this reflector. We describe the fabrication of the suspended grating.

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We derive analytic expressions for the transistor laser in the common-emitter and common-base configuration and compare the performance of the transistor in these two modes of operation. We show that the common-base operation results in a wide-band, small-signal modulation response. This effect is due to reduced carrier lifetime in the base. The bandwidth equalization and the suppression of the relaxation oscillation frequency are shown. A bandwidth of 48 GHz is predicted for a vertical cavity laser biased at 10Ith.

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