The frequency tuning of a vertical-cavity surface-emitting laser through current injection is reported herein. This was achieved by integrating an AlGaAs graded-index p–n-modulator diode with a double-hetero GaAs/AlGaAs laser diode in a vertical cavity formed by an AlAs/AlGaAs-Bragg reflector and a metallic mirror. Experimental results show an obtained gradient of frequency shift up to 0.93 GHz/mA by the modulator current. This effect is at present restricted to approximately 40 mA due to thermal effects. A theoretical model based on the plasma effect and thermal effects agrees with the experimental values and predicts a maximum value for the gradient of frequency shift of 1.15 GHz/mA with the presented structure.
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Gmachl et al. (1993) studied this question.
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