光子学报
光子學報
광자학보
ACTA PHOTONICA SINICA
2008年
2期
297-300
,共4页
光子晶体%光子晶体光纤%非线性系数%有效折射率
光子晶體%光子晶體光纖%非線性繫數%有效摺射率
광자정체%광자정체광섬%비선성계수%유효절사솔
Photonic crystal%Photonie crystal fiber%Nonlinear coefficient%Effective index
针对全反射型光子晶体光纤在短波长处的横向电场分布特点,在忽略空气孔内极为微小的电场影响下,将光纤等效为阶跃型光纤,导出一种新的计算有效折射率的方法.结合Sellmeier公式推出光子晶体光纤的非线性系数与其两个几何结构参量和波长的简洁解析关系.对非线性系数随着这些参量的变化进行了数值计算与讨论,得出非线性随着空气孔直径或空气孔直径与孔间距比 d/A 值的增大成指数上升的规律.在波长为 0.55 μm 和 0.85 μm 时,非线性系数分别可高达 3.5 和 2.54 m-1W-1.
針對全反射型光子晶體光纖在短波長處的橫嚮電場分佈特點,在忽略空氣孔內極為微小的電場影響下,將光纖等效為階躍型光纖,導齣一種新的計算有效摺射率的方法.結閤Sellmeier公式推齣光子晶體光纖的非線性繫數與其兩箇幾何結構參量和波長的簡潔解析關繫.對非線性繫數隨著這些參量的變化進行瞭數值計算與討論,得齣非線性隨著空氣孔直徑或空氣孔直徑與孔間距比 d/A 值的增大成指數上升的規律.在波長為 0.55 μm 和 0.85 μm 時,非線性繫數分彆可高達 3.5 和 2.54 m-1W-1.
침대전반사형광자정체광섬재단파장처적횡향전장분포특점,재홀략공기공내겁위미소적전장영향하,장광섬등효위계약형광섬,도출일충신적계산유효절사솔적방법.결합Sellmeier공식추출광자정체광섬적비선성계수여기량개궤하결구삼량화파장적간길해석관계.대비선성계수수착저사삼량적변화진행료수치계산여토론,득출비선성수착공기공직경혹공기공직경여공간거비 d/A 치적증대성지수상승적규률.재파장위 0.55 μm 화 0.85 μm 시,비선성계수분별가고체 3.5 화 2.54 m-1W-1.
According to distribution characteristics of the transverse electronic field in total internal reflection (TIR) photonic crystal fiber (PCF), a new approach to calculate the effective index is employed with neglecting the small fraction of the electrical power residing in the air-hole regions and regarding TIR PCF as an equivalent step-index fiber. Using Sellmeier equation, a simple expression of the nonlinear coefficient is derived as a function of two geometric structure parameters and light wavelength. And, the changes of the nonlinear coefficient under different parameters are calculated and discussed. It is found that nonlinear coefficient increase exponentially with the increase of air-hole diameter and its ratio to the pitch. In particular, the maximum values of nonlinear coefficient can reach 3.5 and 2.54 m-1W-1 for 0.55 μm and 0.85 μm wavelength respectively.
