Study On Photonic Crystal Fiber Sensor Based On Maher-Zehnder Interferometer

Due to its unique structure and light guiding mechanism,photonic crystal fiber(PCF)has been more and more widely used in the field of optical fiber sensing.Therefore the research of utility model photonic crystal fiber optic sensor for its more convenience and low cost application is of great significance.This article mainly study on characteristics of photonic crystal fiber sensor based on Mach-Zehnder interference.The main content and innovation points of this article are as follows:1)This article summarizes the birth and development of optical fiber sensor,introduces the basic principle,classification and application fields,introduces the development of the Mach-Zehnder interferometer fiber optic sensor and introduces the research progress at home and abroad,introduces the structure,characteristics and classification of photonic crystal fiber and summarizes the development and application of optical fiber sensor.2)This article summarizes the factors affecting the joint of photonic crystal fiber,introduces the fusion of the photonic crystal fiber in detail and describes the concrete process of splicing photonic crystal by using fiber splicer.Three kinds of photonic crystal fibers,total internal reflection photonic crystal fiber,hollow core photonic bandgap fiber and all-solid photonic bandgap fiber have different structures.The fusions of those three photonic bandgap fiber under different splicing parameters are introduced in detail,different splicing structures are informed.The reasons of the formed structures are analyzed by combining the different structural characteristics of three kinds of photonic crystal fibers.3)A dual-microcavities Mach-Zehnder interferometer fiber sensor is proposed,according to the principle of Mach-Zehnder interferometer and the structural characteristics of total internal reflection photonic crystal fiber.We describe the fabrication process and experimental testing process in detail.The experimental results show that the larger the radial dimension of the first microcavity of the MZI photonic crystal fiber sensor is,the greater the sensitivity of the refractive index sensor is.When the radial dimension of the first microcavity is 44.6?m,the refractive index sensitivity can reach 244.16nm/RIU,it is 3.55 times bigger than the direct fusion type photonic crystal fiber MZI sensor whose refractive index sensitivity is 68.69nm/RIU.While the temperature sensitivity of this sensor is very low as only 0.005nm/ ?.In summary,the sensor has many advantages,such as simple manufacturing method,robust structur,and high sensitivity,which could have a good prospect usage in the chemical solution refractive index measurement.4)A stitch-type all-solid photonic band gap fiber Mach-Zehnder interferometer fiber optic sensor is proposed for temperature measurement,according to the principle of Mach-Zehnder interferometer and the structural characteristics of all-solid photonic band-gap photonic crystal fiber.The fabrication and the experimental test procedure of the sensor are described.The experimental results show that the strain sensitivity of this fiber-optic sensor is only 1.19pm/??,but its temperature sensitivity can reach 70.03pm/?.Because of the advantages of the sensor,such as good robustness,high temperature sensitivity and simple production procedures,it will have a good application prospects in temperature measurement.