  In this paper, we report an experimental study of noise features of polarized
and unpolarized amplified spontaneous emission (ASE) with narrow optical
bandwidth, registered from a conventional low-doped erbium fiber. We
demonstrate that ASE noise can be considered as train of Gaussian-like pulses
with random magnitudes, widths, and inter- pulse intervals. The statistical
properties of these three parameters of noise pulsing are analyzed. We also
present the results on the influence of ASE noise upon optical spectrum
broadening, produced by self-phase modulation at propagating along
communication fiber, and demonstrate that ASE noise derivation stands behind
the broadening shaping.
