The noise characteristics of four-wave mixing between short optical pulses in semiconductor optical amplifiers are investigated, with the effects of fast gain saturation taken into account. An approximate simplified expression for the power spectral density of the amplified spontaneous emission noise under the injection of a sequence of short optical pulses is derived, in which the spatial dependence of the inversion factor is included. The dependence of the signal-to-noise ratio of the output four-wave mixing signal on the input pump and signal powers is also investigated.
© 1999 Optical Society of America
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
(060.4510) Fiber optics and optical communications : Optical communications
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
Chongjin Xie and Peida Ye, "Noise characteristics of four-wave mixing between short pulses in semiconductor optical amplifiers," J. Opt. Soc. Am. B 16, 1909-1914 (1999)