An exact result for the spectral density of intensity variations that occur after propagation of ergodic light in a medium having lowest-order-only group-velocity dispersion is obtained and applied to the problem of semiconductor laser phase noise to intensity noise conversion in a single-mode optical fiber. It is shown that the intensity spectrum after propagation formally approaches, for a large laser linewidth or a long (or high-dispersion) fiber, the intensity spectrum of a thermal source having the same line shape as the laser.
© 2000 Optical Society of America
(060.2430) Fiber optics and optical communications : Fibers, single-mode
(060.5060) Fiber optics and optical communications : Phase modulation
(140.5960) Lasers and laser optics : Semiconductor lasers
(260.2030) Physical optics : Dispersion
(270.2500) Quantum optics : Fluctuations, relaxations, and noise
W. K. Marshall, B. Crosignani, and A. Yariv, "Laser phase noise to intensity noise conversion by lowest-order group-velocity dispersion in optical fiber: exact theory," Opt. Lett. 25, 165-167 (2000)