.Study of ultraflattened dispersion square-lattice photonic crystal fiber with low confinement loss[J].Optoelectronics Letters,2009,5(2):124-127 Study of ultraflattened dispersion square-lattice photonic crystal fiber with low confinement loss 谭晓玲  耿优福  田震  王鹏  姚建全 College of Precision Instrument and Optoelectronics Engineering, Institute of Laser and Optoelectronics, Tianjin University, Tianjin 300072, China;Key Laboratory of Optoelectric Information Science and Technology, Ministry of Education, Tianjin University ? Abstract:       A new type ultraflattened dispersion square-lattice photonic crystal fiber with two different air-hole diameters in cladding region is proposed and the dispersion is investigated using a compact 2-D finite difference frequency domain method with the anisotropie perfectly matched layers (PML) absorbing boundary conditions. Through numerical simulation and opti-mizing the geometrical parameters, we find that the photonie crystal fibers proposed can realize ultrafiattened dispersion of 0±0.06 ps/(km·nm) in wavelength range of 1.375 μm to 1.605 μm, which is more fiat than that of triangular PCF, and the confinement loss is as low as about 0.01 dB/km at wavelength of 1.55 μm. Hits: 3599 Download times: 228 View Full Text    Download reader