Beam spreading and M2-factor of electromagnetic Gaussian Schell-model beam propagating in inhomogeneous atmospheric turbulence

Experimental Study on Partially Coherent Optical Coherent Detection

“…Hema R [3] used the properties of the cross spectral density matrix of an EGSM source characterized by 10 parameters to derive the necessary and sufficient conditions that must be met to produce this type of physically achievable beam source. Zhang Biling [4] derived analytical formulas for the root mean square spatial width, root mean square angular width, and M 2 -factor of EGSM beams in turbulence using the Wigner distribution function and the extended Huygens Fresnel integration second-order moment formula. The results indicate that the relative M 2 -factor of EGSM beams decreases with a decreasing zenith angle, initial coherence length, and initial polarization degree, as well as an increasing beam width and intrinsic scale.…”

“…Tanaka T et al [9] investigated the behavior of coherent detection systems in the case of partially coherent beams containing both local oscillator light and signal light. Using incoherent mode decomposition theory and the generalized Huygens-Fresnel principle as foundations, Ke Xizheng et al [4], using the real heterodyne detection system on a 1.3 km outfield communication link, calculated the expression of the weight factor of a number of GSM beams at the receiver. Salem and Rolland [10] investigated how a coherent detection system was affected by the angular error between the signal beam and the partially coherent beam's local oscillator light.…”