The use of ultrashort (femtosecond duration) light pulses for line-of-sight free-space optical (FSO) communication through fog is receiving increasing attention. Assuming that the transmitter power is low enough to preclude nonlinear interactions, and that scattering-induced multipath spread is less than the reciprocal of the scattering-induced Doppler spread, it is shown that the average transmitter-to-receiver fractional energy transfer of an ultrafast FSO system cannot exceed that of a quasimonochromatic (nanosecond pulse duration) system operating at the optimum wavelength within the ultrafast system’s spectrum. Thus, an ultrashort-pulse system is not a solution for high-data-rate FSO communication through fog, because, at best, it will reproduce on average the energy-transfer performance of a wavelength-optimized quasimonochromatic system.
© 2011 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: June 9, 2011
Revised Manuscript: July 22, 2011
Manuscript Accepted: July 29, 2011
Published: August 23, 2011
Jeffrey H. Shapiro, "Quasi-monochromatic bound on ultrashort light-pulse transmission through fog," Opt. Lett. 36, 3356-3358 (2011)