色散平坦渐减光纤产生平坦超宽超连续谱的特性研究

Research on flat ultra-wideband supercontinuum generated in dispersion-flattened decreasing fiber

提出了色散平坦渐减光纤的一种新型色散模型.从频域的全场方程出发,通过数值计算对该种光纤中平坦超连续谱的产生展开了较系统深入的研究.研究表明,该种光纤相比常规色散平坦渐减光纤可以产生更宽的平坦超连续谱,其平坦谱宽可达1000nm以上.进一步的研究表明,光纤的初始峰值色散参量、色散参量微分常量、渐减系数和抽运脉冲的宽度、孤子阶数、初始啁啾等参数对该种光纤中平坦超宽超连续谱的形成都有着非常重要的影响.

Different from the conventional model of dispersion-flattened decreasing fiber, a novel dispersion model of dispersion- flattened decreasing fiber is proposed and supercontinuum generation in is simulated and analyzed by utilizing the total field formation in the frequency domain. It is found that the supercontinuum generated in the latter is by far wider than that in the former and the flat bandwidth can be greater than 1000 nm. It is further found that both the fiber parameters, such as peak dispersion, differential constant of the dispersion, and decreasing coefficient of the dispersion, and the pump pulse parameters, including pulse width, soliton order and frequency chirp, are crucial to the fiat ultra-wideband supercontinuum generation in the fiber.