| In recent years, the explosive growth of computer network and data service provided substantial demands on transmission bandwidth. To increase transmission rate, expand the operation wavelength of silica optical fiber and increase communication channels are the preferred methods for increasing transmission capacity. The increase of optical fiber performance is mainly reflected by the increase of dispersion coefficient, decrease of dispersion slope, decrease of intrinsic loss, increase of effective area, expansion of operation wavelength, etc. The existing light amplification technology cannot well meet the demands on effective gain on new operation wavelength. Therefore, developing the new comprehensively optimized transmission fiber and new broadband near-infrared luminescent fiber has become the hot spot of fiber optic technology research.For this purpose, the thesis studies on the structural design and manufacturing process of Non-zero dispersion shifted fiber (NZDSF) and on the development of bismuth-doped optical fiber and erbium and bismuth co-doped preform rod for SiO2-Al2O3-GeO2material. The major completed work includes:1. Deeply understood the development trend of fiber-optical communication technology and elaborated relevant elementary knowledge on NZDSF design and manufacturing process in details, including the basic performance, structure and standards of optical fiber and main performance indexes of conventional products, which are used for guiding the study on design and manufacturing process of optical fiber products; concluded and summarized the variety and status quo of optical amplifiers, laying a theoretical foundation for the development of bismuth-doped optical fiber and erbium and bismuth-doped preform rods.2. Designed a NZDSF structural model to reduce the refractivity of core, systematically researched the impact of refractive index profile’s parameters on the waveguide performance of optical fiber and provided NZDSF design with large effective area, including two NZDSF products with positive dispersion and one NZDSF product with negative dispersion that meet the G.655D&G.656and G.655E&G.656standards; optimized1550nm abbe number and dispersion slope, and moved zero dispersion wavelength from near1500nm to below1450nm to support the dense wavelength division multiplexing system with the S+C+L operation wavelength.3. Elaborated the principle of MCVD technology and equipment in details, conducted experimental study on MCVD+OVD mixed manufacturing technology and evaluated the performance of optical fiber; proposed a new mixed technology for MCVD+VAD preform rod to enhance the production efficiency of optical fiber, systematically studied the NZDSF manufacturing process with a new technology, analyzed the critical links of new process in details and comprehensively tested the optical performance, anti-bend performance, welding performance and mechanical environment performance of optical fiber.4. Elaborated the process of manufacturing active optical fiber with MCVD and solute doping, studied the manufacturing process of bismuth-doped optical fiber to obtain the near-infrared luminescent bismuth-doped optical fiber series with ultra wide band, experimentally observed the luminescent properties of optical fiber and preform rod, analyzed and discussed the luminescent source of bismuth; the luminescence of1100nm wave band is attributable to the transition of Bi0from2D32(1) to4S32and1300nm wave band to the transition of Bi+from3P1to3P0. The obtained optical fiber is expected to become the ideal gain medium for wideband amplification and tuned laser.5. Prepared the erbium and bismuth-doped optical fiber preform rod and observed the common luminous phenomenon of erbium and bismuth; the experimental results are of instructive significance for developing new wideband amplification optical fiber materials and the prepared erbium and bismuth-doped optical fiber preform rod is expected to be used for the study on the new amplifier with1.3um window and S wave band. |
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