We report the operation of an electrically injected monolithic coupled resonator vertical cavity laser which consists of an active cavity containing InXGal.XAs quantum wells optically coupled to a passive GaAs cavity. This device demonstrates novel modulation characteristics arising from dynamic changes in the coupling between the active and passive cavities. A composite mode theory is used to model the output modulation of the coupled resonator vertical cavity laser. It is shown that the laser

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... intensity can be modulated by either forward or reverse biasing the passive cavity. I Under forward biasing, the modulation is due to while for reverse bias operation the modulation absorption. carrier induced changes in the refractive index, is caused by field dependent cavity enhanced