A 30 dB gain with multi-GHz modulation bandwidth is obtained in an optically pumped vertical cavity Fabry–Pérot structure. This device may be called a vertical cavity amplifying photonic switch (VCAPS). The amplification configuration has been used for a direct measurement of the carrier induced refractive index change over the absorption as well as the gain regime.
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Raj et al. (1994) studied this question.
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