论文部分内容阅读
对准连续光在光子晶体光纤中的传输特性进行了理论和实验研究。利用分步傅里叶方法求解非线性薛定谔方程,数值模拟了准连续光在光子晶体光纤中传输时光谱和脉冲的演化,并分析了其非线性机理和光谱展宽机制。通过比较不同条件下脉冲时域和频域的演化过程,发现低功率、宽脉冲条件下引起光谱展宽的主要因素是光纤反常色散区的调制不稳(MI)作用。此外,还分析了脉冲功率、光纤非线性系数、脉冲宽度等因素对光谱展宽的影响。在理论研究基础上,将脉冲宽度为80 ps的准连续光耦合入70 m长的非线性光子晶体光纤,获得了覆盖整个通信波段的超连续(SC)谱,波长范围1300~1700 nm。
The theoretical and experimental studies on the transmission characteristics of continuous light in photonic crystal fiber are carried out. The nonlinear Schrodinger equation was solved by using the step-by-step Fourier method. The evolution of the spectrum and pulse during the propagation of quasi-continuous light in photonic crystal fiber was numerically simulated. The nonlinear mechanism and spectrum broadening mechanism were also analyzed. By comparing the evolution of pulse time domain and frequency domain under different conditions, it is found that the main factor causing spectral broadening under low power and wide pulse is the instability (MI) of fiber anomalous dispersion. In addition, the influence of pulse power, nonlinear coefficient of fiber and pulse width on spectrum broadening is also analyzed. Based on the theoretical research, a quasi - continuous light with a pulse width of 80 ps is coupled into a 70 m long nonlinear photonic crystal fiber to obtain a superconducting (SC) spectrum covering the entire communication wavelength range from 1300 nm to 1700 nm.