Effect of initial linear chirp on collision characteristics of two solitons in the birefringent fibre |
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Authors: | Zheng Hong-Jun Liu Shan-Liang and Xu Jing-Ping |
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Institution: | Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China; Institute of Optical Communication, Liaocheng University, Liaocheng 252059, China |
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Abstract: | The collision characteristics of the orthogonally
polarized solitons with initial linear frequency chirp
in the linear birefringent fibre for \beta 2<0 are numerically
studied. It is found that initial chirp changes the threshold value
of solitons to form the bound-state in the birefringent fibre. The
effect of initial positive chirp on the threshold value is more
obvious than that of negative chirp. In the case of \delta = 0.7
and initial interval 2\tau0 = 1.25, the two solitons are mutually
bound for 0.2 \le C \le 1, and they do not form the bound-state for
-1 \le C<0.2. Frequency shifts increase with the increase of chirp
parameter C for -1 \le C<0.2, and have the oscillatory structure
for C \ge 0.2. The effect of positive chirp on temporal FWHM is
greater than that of negative chirp. The peak of temporal waveform
oscillates with the propagation distance. The period and amplitude of
the oscillation for the chirped case are greater than those for the
unchirped case, and they vary with the increase of | C| . The peak
of output temporal waveform can be controlled by changing the initial
chirp. |
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Keywords: | frequency chirp solitons collision linear birefringent
fibre soliton-bound state |
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