en عمومى General پژوهشي Research A novel design of Dual-Core Photonic Crystal Fiber (DC-PCF) with silica-air microstructures is proposed in this paper. Nonlinearity and confinement loss of DC-PCF are evaluated by using a Full-Vectorial Finite Element Method (FV-FEM) successfully. By optimizing the geometry of three ring DC-PCFs, a high nonlinearity (52w-1km-1) and low confinement loss (0.001dB/km) can be achieved at 1.55μm wavelength when diameter to pitch ratio (d/Λ) is 0.70. Confinement loss, Full-Vectorial Finite Element Method, Nonlinearity, Photonic Crystal Fiber 97 102 http://ijop.ir/browse.php?a_code=A-10-189-3&slc_lang=en&sid=1 S.S. Mishra 10031947532846001136 10031947532846001136 No Department of Applied Physics, Indian School of Mines, Dhanbad-826004, Jharkhand, India Vinod Kumar Singh singh.vk.ap@ismdhanbad.ac.in 10031947532846001137 10031947532846001137 Yes Department of Applied Physics, Indian School of Mines, Dhanbad-826004, Jharkhand, India