中国物理B ›› 2017, Vol. 26 ›› Issue (6): 64206-064206.doi: 10.1088/1674-1056/26/6/064206
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Wei Chen(陈伟), Xue-Liang Zhang(张学亮), Xiao-Yang Hu(胡晓阳), Zhang-Qi Song(宋章启), Zhou Meng(孟洲)
Wei Chen(陈伟), Xue-Liang Zhang(张学亮), Xiao-Yang Hu(胡晓阳), Zhang-Qi Song(宋章启), Zhou Meng(孟洲)
摘要: We investigate theoretically and numerically the evolutions of optical pulses in the time domain due to modulation instability (MI), where CW pump accompanied with a probe is used as the input of nonlinear fiber. As the fiber length increases, we show that it exhibits beat frequency between the pump and the probe first when the probe lies outside the MI resonance region, and then gradually transforms into a pulse train resulting from spontaneous MI rather than induced MI. However, the regular pulse train is easier to generate in the whole fiber if the probe exists in MI resonance region, and the period of the pulse train is inversely proportional to the frequency spacing between the pump and the probe. It is emphasized that the pulse period can be adjusted only when the probe is in MI resonance region. The numerical simulations are in agreement with the theoretical results. The obtained results are guidable for generating and manipulating the optical pulse train in the fiber.
中图分类号: (Ultrafast processes; optical pulse generation and pulse compression)