Optimization of highly nonlinear dispersion-flattened photonic crystal fiber for supercontinuum generation
Zhang Ya-Ni (张亚妮)
Department of Physics and Information Technology, Baoji University of Arts & Science, Baoji 721007, China The Faculty of Advanced Technology, University of Glamorgan, Pontypridd, CF37 1RP, UK
Abstract A simple type of photonic crystal fiber (PCF) for supercontinuum generation is proposed for the first time. The proposed PCF is composed of a solid silica core and a cladding with square lattice uniform elliptical air holes, which offers not only a large nonlinear coefficient but also a high birefringence and low leakage losses. The PCF with nonlinear coefficient as large as 46 W-1·km-1 at the wavelength of 1.55 μm and a total dispersion as low as ± 2.5 ps·nm-1·km-1 over an ultra-broad waveband range of S-C-L band (wavelength from 1.46 μm to 1.625 μm) is optimized by adjusting its structure parameter, such as the lattice constant Λ, the air-filling fraction f, and the air-hole ellipticity η. The novel PCF with ultra-flattened dispersion, highly nonlinear coefficient, and nearly zero negative dispersion slope will offer a possibility of efficient super-continuum generation in the telecommunication windows using a few ps pulses.
Fund: Project supported by the China Scholarship Council Western Talent Project, China (Grant No. 20095004), the Key Science and Technology Program of Shaanxi Province, China (Grant No. 2010K01-078), the Natural Science Foundation of the Education Department of Shaanxi Province, China (Grant No. 2010JK403), the Science and Technology Program of Baoji, China (Grant No. 2010BJ02), and the Key Program of Scientific Research of Baoji College of Arts and Science, China (Grant No. ZK11016).
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