Research On Preparation Of Liquid Core Photonic Crystal Fiber And Mode-locked Device

Liquid core optical fiber have small bending radius, good heat resistance, high doping concentrations, it widely used in communication, medical and sensor and so on. In recent years study using hollow-core photonic crystal fiber fill liquid as liquid core photonic crystal fiber is becoming a hot spot of research. This article will use the hollow-core photonic crystal fiber with filling solution, research the liquid filling characteristics, filling and face processing as the optical fiber devices, and will application in laser. The research works are included as:In theory, the advantages of hollow-core photonic crystal fiber and dual-core fiber filling liquid is analyzed, fill method, and liquid core optical fiber as a type of photonic devices are all investigated. From the principle that the gain photonic crystal fiber and the mode-locked start devices is carried on the mathematical description. The description of the gain photonic crystal fiber includes two aspects: the intermodal and transmission characteristics, for the liquid core photonic crystal fibers as a photonic devices laid a foundation for the theoretical research.For the first time proposed the liquid dual-core optical fiber as a mode-locked laser with the mode-locked start device. For some simulation, based on the nonlinear coupling properties of the dual core optical fiber, the output pulse was compressed. We achieved under the low power, the cause of the coupling from a fiber core of input power after a coupling length from the adjacent fiber core output, under high power, the change of the input fiber core refractive index by nonlinear, and the phase mismatch between fiber core, so from a fiber core of input power transmitting in the fiber core. This is the saturable absorption effect. Design of the cavity type structure, the liquid dual-core optical fiber as a saturable absorber, and simulation of the dynamic process, have realized for a stable mode-locked output. Some theoretical simulation for dual-core of mode-locked fiber of nonlinear mode coupling and fiber length, self-starting and stable mode locking operation are realized with a fiber length away from integral multiple of linear coupling length. A filter is necessary to stabilize the mode-locking operation when the fiber length is longer than linear coupling length.Experimentally, a simple method of selecting collapsing photonic crystal fiber by using fusion splicer is described, the method can be widely applied to opticadevice design such as mode convertor and liquid core optical fiber, such as for hollow-core photonic crystal fiber and dual-core fiber selective filling. Using the method of siphon filling solution, using the method of truncation observation whether fiber filled evenly, finally through the optical fiber end face grinding and the collapse of work on optical fiber after filling, greatly increase the smoothness of the optical fiber end face, improve the coupling efficiency and the quality of light spot. In order to testing the liquid core optical fiber, the coupling space light for liquid core optical fiber got a good quality of the output light spot. Further, the theoretical guidance, of the liquid core optical fiber as fiber device has applied to explore the visible light waveband amplifiers and oscillators, and will be widely used for other light waveband.