  The performance of all-optical dual-hop relayed free-space optical
communication systems is analytically studied and evaluated. We consider the
case when the total received signal undergoes turbulence-induced channel
fading, modeled by the versatile mixture-Gamma distribution. Also, the
misalignment-induced fading due to the presence of pointing errors is jointly
considered in the enclosed analysis. The performance of both
amplify-and-forward and decode-and-forward relaying transmission is studied,
when heterodyne detection is applied. New closed-form expressions are derived
regarding some key performance metrics of the considered system; namely, the
system outage probability and average bit-error rate.
