BER performance of an FSOC system over atmospheric turbulence channels based on computational temporal ghost imaging

Abstract

In a free space optical communication (FSOC) system, atmospheric turbulence will increase the bit error ratio (BER) and impair FSOC link reliability. Since computational temporal ghost imaging (CTGI) has anti-interference, we present an FSOC system over atmospheric turbulence based on CTGI. The simulation results show that the BER performance of CTGI is better than on–off keying under different atmospheric turbulence regimes. To improve the performance of the CTGI scheme, the influence of the number of transmission samples and code length is analyzed. It is shown that BER performance improves with the increment of the number of samples, while code length has no impact. This scheme provides an idea for reliable communication over atmospheric turbulence and an important reference for improving wireless optical communication in an extreme environment.

Mid-infrared computational temporal ghost imaging

“…The temporal resolution of the downconversion computational TGI is determined by the temporal resolution of the preprogrammed temporal patterns modulated on the 1.5 μm light. Using a 1.5 μm telecom electro-optic modulator with modulation bandwidth up to 40 GHz, one can increase the speed of the temporal object up to tens of Gbps at mid-infrared, and we therefore anticipate the proposed mid-infrared computational TGI scheme to provide new possibilities to characterize advanced high-speed mid-infrared intensity modulators 39 – 41 and enable implementing high-speed free-space optical communications in the 3-5 μm and 8-14 μm atmospheric transmission windows 28 , 42 even in the presence of atmospheric turbulence 43 (see Supplementary note S5 for a possible schematic of high-frequency signal transmission and secure communication in the mid-infrared region using frequency downconversion computational TGI). Furthermore, applying recently developed near-infrared programmable temporally structured pulses 34 in the frequency downconversion process, computational TGI with temporal resolution down to the sub-ps level could lead to a new generation of scan-free pump-probe ghost imaging for the study of ultrafast dynamics in the mid-infrared spectral region such as e.g.…”

Self-Modulated Ghost Imaging in Dynamic Scattering Media

“…Scattering media are widely present in nature, which hinders the direct analysis of scene information from traditional optical systems. Image reconstruction through dynamic and complex scattering media has always been a hot topic [1][2][3][4][5][6][7]. A large body of research has historically focused on compensating or straight-out eliminating scattering effects [8,9], terahertz imaging [10,11], etc.…”