| Effects of initial frequency chirp on the linear propagation characteristics of the exponential optical pulse |
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| 作者姓名： | 郑宏军 刘山亮 |
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| 作者单位： | Department of Electronic Science and Technology, Huazhong University of Science and Technology,Wuhan 430074, China.;Institute of Optical Communication, Liaocheng University,Liaocheng 252059, China.;Institute of Optical Communication, Liaocheng University,Liaocheng 252059, China. |
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| 基金项目： | Project supported by the Research Foundation of Education Department of Shandong Province,China(Grant No J05C09) and supported by the Research Foundation of Liaocheng University. |
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| 摘 要： | In this paper, the linear propagation characteristics of the exponential optical pulse with initial linear and nonlinear frequency chirp are numerically studied in a single mode fibre for β2 〈 0. It can be found that the temporal full width at half maximum and time-bandwidth product of exponential pulse monotonically increase with the increase of propagation distance and decrease with the increase of linear chirp C for C 〈 0.5, go through an initial decreasing stage near ζ= 1, then increase with the increase of propagation distance and linear chirp C for C 〉 0.5. The broadening of pulses with negative chirp is faster than that with positive chirp. The exponential pulse with linear chirp gradually evolves into a near-Gaussian pulse. The effect of nonlinear chirp on waveform of the pulse is much greater than that of linear chirp. The temporal waveform breaking of exponential pulse with nonlinear chirp is first observed in linear propagation. Furthermore, the expressions of the spectral width and time-bandwidth product of the exponential optical pulse with the frequency chirp are given by use of the numerical analysis method.
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| 关 键 词： | 纤维光学 频率 数字解析 指数光脉冲 |
| 收稿时间： | 2005-12-31 |
| 修稿时间： | 2005-12-312006-03-18 |
Effects of initial frequency chirp on the linear propagation characteristics of the exponential optical pulse |
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| Zheng Hong-Jun and Liu Shan-Liang.Effects of initial frequency chirp on the linear propagation characteristics of the exponential optical pulse[J].Chinese Physics B,2006,15(8):1831-1837. |
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| Authors: | Zheng Hong-Jun and Liu Shan-Liang |
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| Abstract: | In this paper, the linear propagation characteristics of the exponential optical
pulse with initial linear and nonlinear frequency chirp are numerically studied in a
single mode fibre for \be2<0. It can be found that the temporal full width at
half maximum and time-bandwidth product of exponential pulse monotonically increase
with the increase of propagation distance and decrease with the increase of linear
chirp C for C<0.5, go through an initial decreasing stage near \zeta=1, then
increase with the increase of propagation distance and linear chirp C for
C\geq0.5. The broadening of pulses with negative chirp is faster than that with
positive chirp. The exponential pulse with linear chirp gradually evolves into a
near-Gaussian pulse. The effect of nonlinear chirp on waveform of the pulse is much
greater than that of linear chirp. The temporal waveform breaking of exponential
pulse with nonlinear chirp is first observed in linear propagation. Furthermore, the
expressions of the spectral width and time-bandwidth product of the exponential
optical pulse with the frequency chirp are given by use of the numerical analysis
method. |
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| Keywords: | fibre optics frequency chirp numerical analysis exponential optical pulse |
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