Nonlinear process-induced spectral changes in hydrogenated amorphous silicon core optical fibre

Pramana: Journal of physics

SHI-HAN YANG^1¹ 

[1] School of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, People’s Republic of China^1

关键词: Nonlinear optics;    hydrogenated amorphous silicon;    optical fibre;    nonlinear processes;    optical spectrum;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

In this paper, the spectral properties of temporal double pulses centred at the same central wavelength and two different central wavelengths are numerically presented based on hydrogenated amorphous silicon core optical fibre. In order to characterise the output spectra of double pulses, the group velocity dispersion and various nonlinear processes including self-phase modulation, cross-phase modulation, two-photon absorption, free carrier absorption and free carrier dispersion are considered in the theoretical model. Numerical results show that, under fixed fibre length condition, the widths of the outcome spectra are strongly dependent on the delay times, peak powers and initial chirps of input double pulses, i.e. widths of the output spectra are proportional to the launched peak powers, and the delay times control the separation between two pulses, resulting in the spectral change within a proper delay time, and the spectral widths are compressed or extended by judiciously adjusting the initial chirps imposed on the input pulses.

【 授权许可】

CC BY