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Improved high birefringence photonic crystal fibres with dispersion flattened and single mode operation

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Chinese Physics B 2011年第2期20卷 277-281页

作者：付博李曙光姚艳艳张磊张美艳 Key Laboratory of Metastable Materials Science and Technology College of ScienceYanshan University

A kind of improved high birefringence photonic crystal fibre （PCF） is proposed in this paper. The characteristics of birefringence, dispersion and leakage loss are studied by the multipole method. Numerical results show that the improved PCF possesses the properties of a flat dispersion and single mode operation. Moreover, with the operating wavelength λ = 1.55/zm, the modal birefringence increases greatly in comparison with that of the original PCF, and the leakage loss is about 104 times smaller than that of the original PCF because the modification gives rise to the strong confinement of guided modes. It is expected that the improved PCF can be used as high birefringence and dispersion flattened fibres.

关键词： photonic crystal fibres birefringence nonlinear optics

Widely tunable dual-pump parametric amplifiers with photonic crystal fibres

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Chinese Physics B 2008年第1期17卷 205-210页

作者：李永忠钱列加陆大全范滇元陈光辉 Research Facility for Advanced Materials State Key Laboratory for Advanced Materials & DevicesDepartment of Optical Science and Engineering Fudan University The Electronics 23rd Research Institute China Electronic Technology Group Corporation

This paper theoretically studies the double-pumped fibre-optical parametric amplifiers （FOPAs） in photonic crystal fibres. Two distinct working regimes of FOPAs are researched, which depend on the dispersion at the central wavelength of the two pumps. Extremely broad tuning range can be obtained when the central pump wavelength is in the normal dispersion regime and is insensitive to the wavelength separation between the two pumps, while the tuning range is narrow in the anomalous dispersion regime and can be significantly enhanced by increasing the wavelength separation. Impacts of higher-order dispersions and temporal walk-off on the gain spectra are also discussed.

关键词： nonlinear optics parametric amplification photonic crystal fibres dispersion

Mode Exciting Properties of photonic crystal fibres with the Optical Field Incident from a Single Mode Fibre

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Chinese Physics Letters 2006年第8期23卷 2125-2128页

作者：刘建国薛力芳开桂云刘艳格张伟刚李燕王志张春书董孝义 Institute of Modern Optics Nankai University Tianjin 300071

We numerically investigate the mode exciting properties of photonic crystal fibres by using the beam propagation method when the optical field is input from a traditional single mode fibre. The results show that both the excited mode spectrum and the coupling-efficiency of each excited mode depend on the normalized pitch А/λ and the normalized hole-size А/λ. Furthermore, we obtain the boundary profile of the optimizing coupling-efficiency for the excited fundamental mode： the boundary （А/λ）＊ is linear to the boundary （А/λ）. All of these will pave the way for smoothing applications of photonic-crystal fibres, such as splicing and designing photonic-crystal-fibre functional devices.

关键词： Mode Exciting Properties photonic crystal fibres Optical Field Incident

Equilateral pentagon polarization maintaining photonic crystal fibre with low nonlinearity

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Chinese Physics B 2012年第2期21卷 357-361页

作者： Yang Han-Rui Li Xu-You Hong Wei Hao Jin-Hui Automation College Harbin Engineering UniversityHarbin 150001China

A new pentagon polarization maintaining photonic crystal fibre with low nonlinearity is introduced. The full vector finite element method was used to investigate the distribution and the effective area of modal field, the nonlinear properties, the effective indices of two orthogonal polarization modes and the birefringence of the new PM-PCF effectively. It is found that the birefringence of the new polarization maintaining photonic crystal fibre can easily achieve the order of 10-4, and it can obtain higher birefringence, larger effectively mode-field area and lower nonlinearity than traditional hexagonal polarization maintaining photonic crystal fibre with the same hole pitch, same hole diameter, and same ring number. It is important for sensing and communication applications, especially has potential application for fibre optical gyroscope.

关键词： photonic crystal fibres fibre optical gyroscope birefringence nonlinearity