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Direct Modulation Characteristics of Composite Resonator Vertical-Cavity Lasers

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5 Author(s)
Grasso, D.M. ; Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL ; Serkland, Darwin K. ; Peake, Gregory M. ; Geib, K.M.
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We report the small-signal modulation characteristics of a monolithic dual resonator vertical cavity surface emitting laser. The modulation response is described by a system of rate equations with two independent carrier populations and a single longitudinal optical mode. The independent optical overlaps and differential gains of the two active regions can each be adjusted to maximize the output response. We show that under certain conditions, the composite resonator may achieve a higher bandwidth than a single cavity laser with the same photon density. We find the relaxation oscillation frequency to depend mainly on the total photon density and not the individual currents in the two cavities. With appropriate current injection, the composite resonator laser achieves a maximum -3-dB bandwidth of 12.5 GHz and a maximum modulation current efficiency factor of approximately 5GHz/ma1/2

Published in:

Quantum Electronics, IEEE Journal of  (Volume:42 ,  Issue: 12 )

Date of Publication:

Dec. 2006

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