Open AccessSelf-phase modulation of nanosecond pulses in fiber amplifiers with gain saturation
Author(s) -
Xinglai Shen,
Haitao Zhang,
Hao He,
Dan Li,
Ping Yan,
Mali Gong
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.004382
Subject(s) - nanosecond , optics , materials science , saturation (graph theory) , optical amplifier , self phase modulation , amplifier , fiber amplifier , doppler broadening , phase modulation , optical fiber , physics , laser , optoelectronics , nonlinear optics , spectral line , phase noise , mathematics , cmos , combinatorics , astronomy
SPM is an important limitation in some fiber lasers and amplifier systems. In this paper, the influence of gain saturation on the SPM-induced spectral broadening for coherent and incoherent nanosecond pulses is discussed. The models of SPM-induced spectral broadening for coherent and incoherent nanosecond pulses are generalized to the amplification with gain saturation. Experiments are conducted to validate our theoretical analysis for incoherent nanosecond pulses in a super-luminescent diode seeded cascaded fiber amplifier system where pulses with high peak power and high pulse energy are generated and gain saturation occurs. Excellent agreements between theoretical analysis and experimental results are obtained, and the influence of higher order nonlinear terms on the SPM effect is observed and analyzed .