Investigation of Solar Noise in Underwater Wireless Optical Communication Systems

Solar noise as an innegligible interference in underwater wireless optical communication (UWOC) systems is a significant concern. But there are no studies on the Channel Impulse Response (CIR) in the presence of solar noise, and there are no functions available for fitting the CIR curve in this scenario. To address this problem, this paper employs Monte Carlo method to simulate the channel impulse response (CIR) of underwater optical communication systems with solar noise. Additionally, we propose a method that utilizes the composite exponential function (CEF) to fit the CIR curve of the turbid water under sunlight. We verify that the introduction of sunlight aggravates waveform broadening, and our newly proposed model has a better accuarcy of numerical fitting in turbid water.The results lay the foundation for subsequent theoretical analysis of system performance.