The freeze of intrapulse Raman scattering effect of ultrashort solitons in optical fiber |
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Authors: | Chi-Feng Chen Boren Luo |
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Affiliation: | a Department of Mechanical Engineering, National Central University, Jhongli City, Taoyuan County 320, Taiwan, ROC b Institute of Electro-Optical Engineering, National Chiao Tung University, Hsin-Chu 300, Taiwan, ROC |
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Abstract: | The effect of intrapulse Raman scattering (IRS) for the propagation of the femtosecond solitons in an optical fiber is investigated. To factually simulate its influence, a combination of 27 Lorentian lines to fit experimental Raman gain profile is adopted. By using nonlinear Schrödinger equation and finite-difference time domain method, the propagations of femtosecond fundamental solitons in an optical fiber are numerically calculated. When the initial power is suitably enhanced, it is found that the pulse shape is almost the same as initial pulse and the delay Raman response only makes small pulse shift. In other words, when ultrashort soliton is considered, the IRS effect is similarly frozen under the enhanced initial power. |
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Keywords: | Raman effect Raman gain Self-frequency shift Femtosecond soliton Ultrashort pulse |
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