Simulation of complexly modulated light pulse propagation in sea water
https://doi.org/10.7868/S2073667319040087
Abstract
The characteristics of a light pulse propagating in water modulated by a radio signal with a frequency varying linearly with time are investigated. The analysis is based on statistical modeling of the pulse and frequency characteristics of the signal and the analytical representation of the signal as a pulsedescribed by a Gaussian function with intrapulse modulation. Changes in the arrival time and the pulse envelope duration caused by the photon pathlength dispersion at distances between the source and receiver up to four white disk visibility depths are estimated. It is shown that these changes may have different signs depending on the modulation frequency range . A comparison was made between arrival times and durations of the pulse with a time-varying frequency and the pulse after matched processing consisting in convolution with the original modulating signal. It is shown that in the investigated range of parameter changes, multiple scattering does not prevent the compression of a complex signal when it is matched processing.
Keywords
underwater optical communication,
complex signals,
photon density waves,
temporal dispersion,
matched processing,
Monte Carlo simulation
Supporting agencies: This study was supported by the Russian Foundation for Basic Research (project 19-02-0089) and by the State project “Development of radiophysical methods for ocean research” (0035-2019-0006)
About the Authors
A. G. Luchinin
Institute of Applied Physics RAS
Russian Federation
Russian Federation
Nizhny Novgorod
M. Yu. Kirillin
Institute of Applied Physics RAS
Russian Federation
Russian Federation
Nizhny Novgorod
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Review
For citations:
Luchinin A.G., Kirillin M.Yu. Simulation of complexly modulated light pulse propagation in sea water. Fundamental and Applied Hydrophysics. 2019;12(4):66-77. https://doi.org/10.7868/S2073667319040087
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