物理学报
物理學報
물이학보
2013年
8期
084215-1-084215-6
,共1页
光子晶体光纤%高双折射%高非线性%有限元法
光子晶體光纖%高雙摺射%高非線性%有限元法
광자정체광섬%고쌍절사%고비선성%유한원법
photonic crystal fiber%high birefringence%high nonlinearity%finite element method
设计了一种高双折射高非线性光子晶体光纤,采用全矢量有限元法研究了这种光纤的基模模场、双折射、非线性、有效模面积及色散特性.数值研究发现,减小孔间距Λ的大小,在波长1550 nm处,该光纤可获得10?2数量级的双折射B,比普通的椭圆保偏光纤高约两个数量级;同时,该光纤可获得42 W?1·km?1的高非线性系数γ.另外,分别在可见光和近红外波段出现了两个零色散波长,在波长800—2000 nm之间具有良好的色散平坦特性.这种设计为获得高双折射高非线性超平坦色散光子晶体光纤提供了一种新的方法,该光纤在偏振控制、非线性光学和色散控制方面具有广泛的应用前景.
設計瞭一種高雙摺射高非線性光子晶體光纖,採用全矢量有限元法研究瞭這種光纖的基模模場、雙摺射、非線性、有效模麵積及色散特性.數值研究髮現,減小孔間距Λ的大小,在波長1550 nm處,該光纖可穫得10?2數量級的雙摺射B,比普通的橢圓保偏光纖高約兩箇數量級;同時,該光纖可穫得42 W?1·km?1的高非線性繫數γ.另外,分彆在可見光和近紅外波段齣現瞭兩箇零色散波長,在波長800—2000 nm之間具有良好的色散平坦特性.這種設計為穫得高雙摺射高非線性超平坦色散光子晶體光纖提供瞭一種新的方法,該光纖在偏振控製、非線性光學和色散控製方麵具有廣汎的應用前景.
설계료일충고쌍절사고비선성광자정체광섬,채용전시량유한원법연구료저충광섬적기모모장、쌍절사、비선성、유효모면적급색산특성.수치연구발현,감소공간거Λ적대소,재파장1550 nm처,해광섬가획득10?2수량급적쌍절사B,비보통적타원보편광섬고약량개수량급;동시,해광섬가획득42 W?1·km?1적고비선성계수γ.령외,분별재가견광화근홍외파단출현료량개령색산파장,재파장800—2000 nm지간구유량호적색산평탄특성.저충설계위획득고쌍절사고비선성초평탄색산광자정체광섬제공료일충신적방법,해광섬재편진공제、비선성광학화색산공제방면구유엄범적응용전경.
@@@@A kind of highly birefringent and highly nonlinear photonic crystal fiber (PCF) is proposed. The fundamental mode field, birefrin-gence, nonlinear coefficient, effective mode area and dispersion characteristic of the fiber are studied by the full-vector finite element method. Simulation results show that the birefringence becomes larger by reducing the air hole pitch, and the birefringence reaches up to 10?2 at a wavelength of 1550 nm, which is about two orders of magnitude higher than that of the regular elliptic polarization maintaining fiber. At the same time, a nonlinear coefficient of 42 W?1 ·km?1 is obtained. There are two zero dispersion wavelengths in the visible and the near-infrared region respectively, and flattened chromatic dispersion from 800 nm to 2000 nm is obtained. Such a design provides a new approach to obtaining highly birefringent and highly nonlinear PCF, and the fiber has a broad prospect of application in the polarization control, nonlinear optics and dispersion control.
