Investigated were the opportunities of direct conversion of modulated laser radiation with mean power of 10–40 dBm for combined power and information transfer fiber-optic lines. Have been studied optical sensors based on common p-n AlGaAs/GaAs and n-p GaInP/GaAs structures, including the ones with multiple photovoltaic cells, providing acceptable efficiency values at optical-to-electrical conversion at wavelength 809–830 nm. Developed was a special circuit allowing extraction of the information signal at one time with power conversion. Shown, that at 30–35 dBm of incident power, laser power converters can demonstrate up to 55 % efficiency and 500 MHz bandwidth. Maximum laser source modulation depth in these modes shouldn’t exceed 3.5 %.
In the work, stages of designing, optimizing, manufacturing and testing the circular flat-plate Fresnel lenses (FLs) for
photovoltaic modules with multi-junction solar cells (SCs) are presented. A mathematical model based on ray tracing has
been developed for optimizing lenses design parameters and calculating their optical-power characteristics (OPCs). In
searching the optimum combination of the lens aperture, its focal distance and refracting profile parameters, the
optimization criterion was the maximum of the average sunlight concentration at high optical efficiency in the focal spot
of minimum size. Analysis of OPCs of circular Fresnel lenses with conical (the generatrix of surface is a straight line)
and curvilinear (the generatrix of surface is a curved line) refracting surfaces has been carried out. Fresnel lens
specimens were fabricated and a control of their profile parameters has been done. Experimental lens OPCs have been
obtained with use of newly developed optical test bench. A degree of the effect of the light flux and Fresnel lens
geometrical imperfections on validity of the experimental data interpretation has been determined. To establish the lens
optical efficiency values at standard irradiance conditions, the correction of the calculation model was done. Also, the
effect of temperature on the lens optical efficiency is studied.