Research On Theory And Correlation Technique Of Side-Polished Fiber Microbeam Resonator Excited Optically

Recently, optically excited microresonator has obtained widespread attentions. This microresonator has many merits, such as small size, high precision and all-optical propagation feature, so it is especially suitable for strong electro-magnetic interference, flammable and explosive environment, and industrial measurement in narrow space.The traditional optically excited microresonators need additional exciting and detecting fibers, so their optical system is too complex to be realized.For this reason, we studied a novel all-optical microresonator structure by utilizing the polished part of the optical fiber as sensitive element. In this case, exciting fiber, detecting fiber as well as sensitive element were coupled naturally as a whole, so that the shortcoming of former complex optical system was overcome.This paper research on the theory and correlation technique of side-polished fiber microbeam resonator excited optically.Firstly, we analyze the Q factor in our structure and mainly analyzed the support loss of this structure in detail. Support loss in this structure has been modeled based on the theories of resonant beams and 2D elastic waves. Using the Fourier transform, a computational equation for the support quality factor is obtained. At last, the established novel computational model was simulated by MATLAB and we obtained high theoretical Q factor which will demonstrate the usability and feasibility for this novel all-optical microresonator. This analysis of the damping just establishes the fundamental theory for our structure.Secondly, this paper researches the production engineering and analyzes the relative merits of these methods to process this side-polished fiber and analyzes the loss characteristics of multi-coating side-polished fiber. The results indicate that the losses of the propagation modes in the fiber are related to the distance between the polished plane and the fiber core, and to the refractive index and the thickness of the polymer adhesive.Finally, we numerically calculate the influence of every damping to the Q factor for the side-polished fiber and simulate every influence factors for the damping. The results indicate that the losses of the propagation modes in the fiber decrease as thickness increase, increase as length increase, decrease as environmental temperature increase, decrease as external pressure increase. At last, the natural frequency of side-polished resonator is simulated by ANSYS software.