Effect of beam mode of partially Gaussian Schell-model beam on a heterodyne detection system in turbulence

Abstract

A mathematical model considering the transmission of a partially coherent Gaussian Schell-model (GSM) beam in slant turbulence atmosphere of heterodyne detection was established. A closed-form expression of the weighting factor for the partially GSM beam at the receiving end was derived. The effect of the beam mode on the performance of the proposed detection system was theoretically investigated. The results show that the proportion of the fundamental mode and heterodyne efficiency can be optimized by controlling the waist radius of the signal and local oscillator beams. The inner scale of turbulence significantly affects the heterodyne efficiency and normalized M 2 . With a larger mode order, the proportion of the fundamental mode and heterodyne efficiency are lowered.

An Effective Method for Enhancing Heterodyne Efficiency by Comparing the Effect of Degree of Polarization on an Uplink Path and a Downlink Path

“…It is well known that optical heterodyne (coherent) detection technology is widely used in free-space optical communications (FSOCs), broadcasting, radar systems and other fields since the reception sensitivity of this technology is nearly 20 dB higher than that of intensity modulation/direct detection methods [1][2][3][4][5]. Heterodyne detection has been widely used in satellite-satellite [6], satellite-ground [7,8] and ground-ground [9] communication links in recent decades.…”

“…Li et al [5] developed a mathematical model for a heterodyne detection system for partially coherent Gaussian Schell beams under the Tatarskii turbulence spectrum in 2015. Furthermore, some of the authors of this paper investigated the effect of signal beam propagation in atmospheric turbulence on heterodyne detection, e.g., angle-of-arrival fluctuation [3], beam mode of the partially coherent Gaussian Schell-model beam [1,2], irradiance and phase fluctuations [13] and wavefront correction [10]. However, these works were based on the vector theory of partially coherent light fields or Gaussian beam.…”