Authors G.G. Chervyakov
Month, Year 09, 2015 @en
Index UDC 621.383.06:621.391.94
Abstract Development of fiber-optic networks of the information transmission requires new solutions, which would increase their throughput capacity. One possibility would be to use the nonlinear capacitance, characteristic for a number of semiconductor devices. Their advantage consists in the absence of losses during conversion and in the significant reduction of noise characteristics of the process of conversion. The arbitrary current-voltage characteristic of the capacitance is used for the generalization of analysis. The analysis of the process is conducted for the case of demodulation of the complex group signal with a microwave subcarrier, which modulated the coherent optical radiation. The solution is based on the Manley-Rowe relation, which allows to determine the basic parameters of the process of demodulation by the nonlinear capacitance and to find optimal modes according to the noise and amplifying characteristics. Various options and modes of conversion and analyzed. It is depicted that the following modes can be implemented in the capacitive photoconverters: with a non-regenerative amplification and conversion of the frequency of the signal 1 down with п < 1 (with attenuation during the process of conversion) or up with п > 1 (with amplification during the process of conversion); with a regenerative amplification at the frequency 1 without frequency conversion (amplifier with idling circuit or the confluent amplifier). The analysis revealed that during the conversion on the nonlinear capacitance noises are lower than during a nonlinear conductance due to the absence of thermal and shot noises and the shot noise of the permanent component of the photocurrent remains the main source of the noises; the amplification during the process of conversion is determined by the parametric effect as well as regeneration. Thus, the obtained results allow to use previously unexamined physical phenomena in semiconductor materials and devices, and can be useful for developers of components and systems of visual range.

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Keywords Optical demodulation; nonlinear capacitance; radio heterodyne.
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