The confinement losses in air-guiding photonic bandgap fibers （PBGFs） with air hole missing are studied with the full-vector finite-element method. It is confirmed that there are two loss peaks （1.555 and 1.598 μm...The confinement losses in air-guiding photonic bandgap fibers （PBGFs） with air hole missing are studied with the full-vector finite-element method. It is confirmed that there are two loss peaks （1.555 and 1.598 μm） if there is a hole missing in the cladding far from the core. The closer to the core the hole missing is, the larger the confinement losses are, and even no mode could propagate in the core. The main power of the fundamental mode leaks from the core to the cladding defect. The quality of PBGFs can be improved through controlling the number and position of defects.展开更多
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 a...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 um and a total dispersion as low as ±2.5 ps. nm-1 · km -1 over an ultra-broad waveband range of the S-C-L band （wavelength from 1.46 um to 1.625 um） is optimized by adjusting its structure parameter, such as the lattice constant A, 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 telecommunication windows using a few ps pulses.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No. 61077084)
文摘The confinement losses in air-guiding photonic bandgap fibers （PBGFs） with air hole missing are studied with the full-vector finite-element method. It is confirmed that there are two loss peaks （1.555 and 1.598 μm） if there is a hole missing in the cladding far from the core. The closer to the core the hole missing is, the larger the confinement losses are, and even no mode could propagate in the core. The main power of the fundamental mode leaks from the core to the cladding defect. The quality of PBGFs can be improved through controlling the number and position of defects.
基金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)+2 种基金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)the Key Program of Scientific Research of Baoji College of Arts and Science,China (Grant No. ZK11016)
文摘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 um and a total dispersion as low as ±2.5 ps. nm-1 · km -1 over an ultra-broad waveband range of the S-C-L band （wavelength from 1.46 um to 1.625 um） is optimized by adjusting its structure parameter, such as the lattice constant A, 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 telecommunication windows using a few ps pulses.
