Microwave properties of InGaAlAs resonant-tunneling optical modulators

Impedance of resonant-tunneling heterostructure diodes (RTD) based on InGaAlAs and designed for modulation of optical radiation was experimentally studied in the frequency range of 45 MHz-18 GHz. The dependence of the equivalent circuit parameters versus bias voltage was analyzed and the current harmonic spectrum at varistor frequency multiplication was calculated. The effect of frequency multiplication was experimentally demonstrated at low frequencies.