Effects of initial frequency chirp on the linear propagation characteristics of the exponential optical pulse
Zheng Hong-Jun(郑宏军)a)b) and Liu Shan-Liang (刘山亮)b)
a Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China; b Institute of Optical Communication, Liaocheng University, Liaocheng 252059, China
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 $\beta_2$ < 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 $C\geq$ 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.
Received: 31 December 2005
Revised: 18 March 2006
Accepted manuscript online:
PACS:
42.79.Sz
(Optical communication systems, multiplexers, and demultiplexers?)
(Ordinary and partial differential equations; boundary value problems)
Fund: 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.
Cite this article:
Zheng Hong-Jun(郑宏军) and Liu Shan-Liang (刘山亮) Effects of initial frequency chirp on the linear propagation characteristics of the exponential optical pulse 2006 Chinese Physics 15 1831
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