Abstract

A photonic crystal fiber (PCF) is proposed that is composed of a central defect core and cladding with elliptical air holes along the fiber length. In the structure, two circular air holes are enlarged near the central region to reduce core size and induce high nonlinearity. Its dispersion, birefringence, nonlinearity coefficient, and confinement loss are investigated simultaneously by using the full-vectorial finite element method with anisotropic perfectly matched layers. Numerical results indicate that the proposed PCF has two zero-dispersion wavelengths (ZDWs) and stronger confinement ability in its guide mode, in which the confinement loss is lower than ${10}^{-2}\mathrm{dB}{\mathrm{m}}^{-1}$. The two high-birefringence ZDWs can be optimized by adjusting the geometric parameters of the proposed fiber, such as air-filling fraction $d/\mathrm{\Lambda }$ and air-hole ellipticity η. With the fixed parameters $d/\mathrm{\Lambda }=0.6$ and $\eta =2.85$, the two ZDWs are present in the communication window, and the corresponding birefringence and nonlinearity coefficient are as high as $4.8\times {10}^{-2}$ and $105{\mathrm{W}}^{-1}{\mathrm{km}}^{-1}$, respectively. The proposed two-ZDW PCF with high birefringence and nonlinearity will have important applications in four-wave mixing and higher-order dispersion effects.

© 2011 Optical Society of America

Design and optimization of highly nonlinear low-dispersion crystal fiber with high birefringence for four-wave mixing

Ya-Ni Zhang, Li-Yong Ren, Yong-Kang Gong, Xiao-Hui Li, Lei-Ran Wang, and Chuan-Dong Sun
Appl. Opt. 49(16) 3208-3214 (2010)

Design for a high birefringence photonic crystal fiber with multimode and low loss

Fengji Gui, Ping Jiang, Huajun Yang, Yan Qin, and Weinan Caiyang
Appl. Opt. 57(1) 6-13 (2018)

Polarization effects in a highly birefringent nonlinear photonic crystal fiber with two-zero dispersion wavelengths

Brendan J. Chick, JamesW.M. Chon, and Min Gu
Opt. Express 16(24) 20099-20105 (2008)

Elliptical-spiral elliptical-hole photonic crystal fiber with high birefringence, large nonlinearity, and two zero dispersion

Shanshan Zhang, Weiguang Shi, Cheng Zhang, Jia Shi, Jixuan Wu, Hongqiang Li, Yange Liu, and Bo Zhang
Appl. Opt. 59(2) 521-529 (2020)

Analysis of birefringent and dispersive properties of photonic crystal fibers

S. Lu, W. Li, H. Guo, and M. Lu
Appl. Opt. 50(30) 5798-5802 (2011)