高双折射和大非线性光子晶体光纤中超连续谱的产生
Supercontinuum Generation in Photonic Crystal Fibers Possessing High Birefringence and Large Optical Nonlinearity
摘要：
设计了一种折射率引导的高双折射光子晶体光纤，该光纤在1550 nm和1064 nm处分别具有约3.33 × 10^（-2）和约1.75 × 10^（-2）的双折射和约80 W^（-1）km^（-1）的有效非线性。利用峰值功率为1 kW的1064 nm泵浦源在所提出的光纤中产生了光学超连续谱。采用时域有限差分法（FDTD）研究了光纤的双折射、模场、V参数、走离和光学非线性等光学特性，采用分步傅里叶法求解了非线性薛定谔方程，研究了超连续谱的产生。仿真结果表明，水平输入脉冲产生优越的连续相比，垂直极化输入。然而，在水平偏振的输入光的情况下，连续谱的加宽约为1450 nm，而对于垂直偏振的输入光，连续谱的加宽约为2350 nm。
英文摘要：
This paper presents the design of an index guided highly birefringent photonic crystal fiber which promises to yield very large birefringence ~3.33 X 10^(-2) at 1550 nm and ~1.75 X 10^(-2) at 1064 nm as well as large effective nonlinearity ~80 W^(-1)km^(-1). Optical supercontinuum generation in the proposed fiber using a 1064 nm pump source with peak power of 1kW has been also presented. Finite difference time domain method (FDTD) has been employed to examine the optical properties such as fiber birefringence, mode field, V-parameter, walk-off and optical nonlinearity, while the Split-step Fourier method is used to solve the nonlinear Schrodinger equation felicitating the study of supercontinuum generation. Simulation results indicate that horizontal input pulse yields superior continuum in comparison to that of the vertically polarized input. However, the broadening of the continuum is about 1450 nm in case of horizontally polarized input light whereas it is approximately 2350 nm for vertically polarized.
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