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Study On Theory And Experiment Of Magnetic-field Tunable Devices Based On Optical Microfiber

Posted on:2016-04-16Degree:MasterType:Thesis
Country:ChinaCandidate:J X WuFull Text:PDF
GTID:2308330461489342Subject:Optical Engineering
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With the amazing expansion of information science and technology, the transmission and processing demand of large volume data and high speed information is higher. The optical fiber devices is to become an important research topic in the field of optoelectronic, which is micro-nano, integration, high performance and low power dissipation. Due to the special geometric structure of optical microfiber, it has the characteristics of big surface to volume ratio, great waveguide dispersion, high nonlinear effect, low optical loss, strong abolitity of ligh constraint, and large evanescent field effect. Thus optical microfiber has been attracted a lot of attention. Noweadays, it could be gained through a variety of technology, an optical microfiber possesses the special transmission properties and versatile waveguide structures. Micro-nano and integration is the trendency of optical fiber devices. It provides a good condition to design photonic tenability devices due to ease to combine to the function materials.Magnetic-field detection has attracted considerable research interests, which plays an important role in military, aerospace, biomedical, and mechanical testing. Photonic magnetic-field tunability devices based on optical microfiber and magnetic fluid show great potential in the sensing and communication fields. The paper introduces the spectrum characteristics of these optical microfibers which are fabricated by two kinds of tapering programs and different kinds of optical fibers and integrated with magnetic fluid. The theoretical and experimental reaseaches are carried out, including different production methods of optical microfiber, philosophy and digital analog, and the corresponding tentative researches. The magnetic-field tunabilty devices are realized based on optical microfibers and magnetic fluids. In this paper, the research work mainly includes:1. A magnetic field tunability device is proposed based on the cladding decreased thin core microfiber and magnetic fluids. The mode field distribution is changed through the corrosion of thin core fiber, and the high sensitive intensity-interrogated magnetic field tunability device is gained. Theoretical analysis shows that the reason of the variation of the transmission loss.2. A magnetic field tunability device of square tapered no-core fiber and magnetic fluids is proposed. The evanescent field effect is enhanced by tapering the square no-core fiber and the transmission property of the square no-core fiber is analyzed and the modes propagating into the square no-core fiber is simulated and demonstrated. Also the mode orders involved in the mode interference are exact by numeral simulation. By immersed into the magnetic field, the wavelength tuning magnetic field tunability device is achieved..3. A magnetic field sensing device are proposed based on the S-tapered microfiber and magnetic fluids, which is fabricated by tapering single mode fiber using simple fusion spicing. Making use of arc discharge to change the single mode fiber in the structure of the axial, the structure of the single mode fiber is shape change and the S-tapered microfiber is fabricated. The mode exciting and mode coupling is achieved and to form the Mach-Zehnder interferometer, as the light propagates through the S-tapered region. The wavelength and transmission loss of the corresponding dips are analyzed, while the external magnetic field is changed.4. Modes excite in the tapered region and coupling in the core-offset region to form the mode interferometer. Under the external magnetic field, the response of the transmission loss are analyzed both these dual-direction. Experimental results show that the structure could been achieved the measurement of dual-direction.
Keywords/Search Tags:microfiber, magnetic fluid, thin core fiber, square no-core fiber, S-tapered microfiber, magnetic field tunable device
PDF Full Text Request
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