The Design And Attenuation Study Of Ionic Liquids Based Liquid Core Optical Fiber

Liquid core optical fiber is one kind of new structure optical transmission product, consisting of liquid (as core) and polymer material (as cladding and covering layer). There are many characteristics, such as big core diameter, great numerical aperture, broad transmission spectrum, high transmission efficiency, long life and so on. Take fit liquid as core according to the need to achieve the good effect.In this paper, the liquid core optical fiber is made up of the new soft functional material-ionic liquid which meets the demands of core liquid (core) and tetrauoroethylene-co-hexa uoropropylene (inside diameter:4mm) which can transmit visible light better with optimized Teflon AF1600membrane (cladding). In the paper, the attenuation of ionic liquids based liquid core optical fiber was studied for the first time by interpolation method. The results show that the attenuation increases linearly along with the length increasing, which conforms the optical fiber decay law. And with the increasing of refractive index of the core, the attenuation reduces gradually, and then tends to be stable when the numerical aperture achieves0.6. The coefficient of attenuation of [BMIm][ClO4] based liquid core optical fiber (0.32658dB/cm) is the lowest.In order to compare the commercial calcium chloride solution and ionic liquid based liquid core optical fiber, we measured the attenuation of the commercial calcium chloride solution based liquid core optical fiber. It is found that there are two kinds of ionic liquid based liquid core optical fibers the attenuation coefficient of which are lower than the CaCl2solution based liquid core optical fiber. For [BMIm][ClO4] and CaCl2solution based liquid core optical fiber, their transmission performance were measured and compared at～-10℃and20℃～100℃separately. The results revealed that CaCl2solution based liquid core optical fiber cannot work well at～-10℃and above60℃due to the crystallization and bubbles respectively. While the transmittances of [BMIm][ClO4] based liquid core optical fiber are above90%at the both temperatures.