Research On The Slow Light In Microsphere Based On The Theory Of Whispering-Gallery Mode And Its Sensing Application

Fiber optic gyroscope is a senser to accurately measure the angular velocity of the moving object. It is widely used in the aviation, marine, aerospace and defense industries. Subject to the current level of technology, it is diffcurt for fiber optic gyroscope to improve the accuracy and reduce the volume by reducing the internal fiber length and curing technology constraints. The development of slow light technology provides an effective methodto solve this problem.The development of slow light technology provides an effective method to enhance precision of the fiber optic gyroscope without increasing the size. There are no fiber optic gyroscopes using slow light technology in engineering, the majority of research remain in the laboratory. But with the further research and exploration of the slow light generation technology, slow light fiber optic gyroscope advantage with high precision, small size has been aroused widely concern, and showed great potential applications. The main work is showed as follow:Firstly, a series of research of currently available technology of slow light were studied and their strengths and weakness were also analyzed. Microsphere resonators with double taper fiber as slow light programs were selected. And it was also proved that the slow light could increase the sensitivity of fiber optic gyroscope in theoreticalSecondly, slow light system consisting of microsphere resonators and double tapered fiber has been analysied and simulated in theoretical. The phase shift and the transmission of two situations of a single microsphere resonator and two microsphere resonators respectively were carried out through the theoretical derivation and mathematical simulation, and a single microsphere resonator solution was selected at last.Thirdly, a directional coupler theorem was used to deduct the input-output characteristic, state phase shift, the transmission rate, delay, and the speed of light of a single microsphere cavity resonator in overcoupling and got a function of distance for the theoretical derivation and mathematical simulationin, and simulation results are analyzed.Finally, a fiber optic gyroscope experiment platform was built. And the theoretical analysis and simulation optimization of gyroscope after introduction of slow light were carried out to determine the radius microsphere resonator and the distance between microsphere resonator and the tapered fiber. Power module, the light source module and a detection module were designed, and the performance of the gyroscope system was well and stable.In this thesis, through theoretical study and mathematical simulation, the transmission characteristics of microsphere resonator and its delay time mathematical expressions has been obtained. Through the theoretical analysis and simulation of the sensitivity of fiber optic gyroscope, it was proved that the introduction of slow light can improve the accuracy of interferometric fiberoptic gyroscope measurement. With the further improvement of the theory and technology, the slow light fiber optic gyroscope will play a greater role.