Investigation Of High Birefringence Photonic Crystal Fiber

Photonic crystal fiber (PCF) is a new type of transmission fiber, compared with the traditionalfiber, PCF has many unique properties, such as no endless single-mode transmission characteristics,low loss characteristics, adjustable dispersion characteristics, high non-linear characteristics, highbirefringence properties. The advent of PCF provides an effective method for the development ofnovel high-birefringence fiber. Due to the air-holes structure of the photonic crystal fiber, a highbirefringence photonic crystal fiber can be obtained by changing the shape, size and hole spacing ofair holes, or injecting gas, liquid in air holes.A novel combination of gradient photonic crystal fiber is proposed in this paper, the birefringence, its loss and dispersion properties are studied. The characteristics of photonic crystal fiber by fillingthermal sensitive liquid of different levels was researched.The details are described as follows:1.Firstly, the invention, transmission mechanism property and related Application of PCF are clarified. Then, the development of sensor technology was briefly discussed: fiber optic sensing, photonic crystal fiber sensing.2.Several common theoretical research methods,especially the principle of the multipole method, the finite element method for PCF and the application steps of related software for PCF are introduced to lay foundation for the design and analysis of highly birefringent PCF.3.A novel combination of gradient photonic crystal fiber was designed. Based on the theory ofmultilevel methods, we analysis the specific structure of optical fiber. By changeing the structure parameters of the photonic crystal fiber, its birefringence, confinement loss, the process changes dispersion and mode field property are observed.4.Three different filling ways were used to fill the novel photonic crystal fiber. In these three ways, the impact of temperature on birefringence and loss were analyzed. The impact on photonic crystal fiber by filling liquid in big air holes are discussed in detail.5.Temperature sensing properties based on Sagnic effect is studied in the fiber atmospher, which is obtained by welding the high birefringence photonic crystal fiber with single mode fiber.