光子晶体光纤中超连续谱产生的理论与实验研究  

Experimental and Numerical Study of Supercontinuum Generation in Photonic Crystal Fiber

作　　者：李晓青[1] 张书敏[1] 李丹[1] 赵光贞[1] 张志君[1] 杨振军[1] 庞兆广[1] 

机构地区：[1]河北师范大学物理科学与信息工程学院,石家庄050016

出　　处：《光子学报》2008年第9期1805-1809,共5页Acta Photonica Sinica

基　　金：河北省自然科学基金(F2006000183);河北省教育厅科研计划(2001241);河北师范大学博士科研启动基金(L2005B05)资助

摘　　要：研究了光子晶体光纤中超连续激光光源的产生机理.利用非线性偏振旋转技术产生的中心波长为1556.0nm的飞秒光脉冲作为泵浦光源,在69m长的高非线性光子晶体光纤中,得到了20dB带宽约为140nm的超连续谱;采用实验和数值模拟方法,研究了不同泵浦功率下超连续谱形成的过程.结果表明,在不同的泵浦功率下,超连续谱的形成机理不同,在各种非线性效应的共同作用下,泵浦光脉冲的峰值功率越高,得到超连续谱的带宽越宽,实验与数值模拟结果一致.另外,要想获得平坦的宽带超连续谱,必须选择合适的光纤长度.Formating mechanism of supercontinuum generation in highly nonlinear photonic crystal fiber is studied. Using nonlinear polarization rotation technique,a stable femtosecond optical pulse with the central wavelength of 1 556. 0 nm as pumping source is obtained, and by delivering this pulse into a highly nonlinear photonic crystal fiber,a supercontinuum with the 20 dB bandwith about the 140 nm has been obtained in experiment; Supercontinuum generation in different pump power was experimentally and numerically investigated. It is shown that supercontinuum has the different formatting mechanism with different pump power, and under various nonlinear effects, the more higher of the pump power; the more wide of the supercontinuum. It is found that qualitative agreement between the experiments and the simulations,the simulations shows that it exists an optimal fiber length for generation of the flat, broad supercontinuum. The SC band bandwidth will became smoother and broader by the frequency chirp.

关 键 词：飞秒光脉冲 超连续谱 光子晶体光纤 

分 类 号：TN252[电子电信—物理电子学]