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Study And Fabrication Of Single Mode Large-mode-diameter High Concentration Erbium Doped Fibers And Related Devices

Posted on:2013-01-18Degree:DoctorType:Dissertation
Country:ChinaCandidate:Z M LiuFull Text:PDF
GTID:1118330371959335Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
Novel high concentration rare-earth doped fibers and related devices are critical parts for next optical network and high power fiber lasers. Under the supports of one the Major State Basic Research Development Program of China(973):"Research on the theory and key techniques of optical fiber devices towards the optical switching networks", and two National High Technology Research and Development Programs of China(863):"Novel optical switching technology" and "Research on optical transmission technology with several fibers amplified by a pump source", this thesis is devoted to profound study and fabrication of single mode large-mode-field-diameter high concentration erbium doped fibers (SM-LMFD-HC-EDF) and related devices. The main achievements of this thesis are listed as follows:1. A novel method for designing SM-LMFD-HC-EDF is proposed based on rare-earth stratified doped idea. It is effective to solve the problem that large mode field area and high concentration erbium ions can't be achieved simultaneously in the traditional single mode erbium doped fibers. The impact of structure parameters on characteristic parameters of SM-LMFD-HC-EDF is analyzed theoretically. Sample of SM-LMFD-HC-EDF with two erbium doped layers in the core is fabricated by MCVD method combined with soloution doping technique successfully. The mode field diameter and the doping concentration of erbium ions of the sample fiber are about12μm and5332ppm, respectively, and its peak absorption coefficient is84.253dB/m at the wavelength of1530nm. The gain performance of fiber sample is tested and the short linear carvity fiber laser based on fiber sample is investigated. Experimental results show that SM-LMFD-HC-EDF with high quality can be obtained using the rare-earth stratified doped design method.2. The impact of energy distribution of each mode in the inner cladding of D-shape double clad fiber on pumping light absorption efficiency is studied theoretically. A novel D-shape high concentration erbium doped photosensitive double clad fiber is manufactured experimentally using the lateral grinding method based on the preform of SM-LMFD-HC-EDF. A uniform fiber Bragg grating with the reflectivity of90%at the wavelength of1545.297nm is written on this double clad fiber sample successfully and the novel fiber will be a good choice for all-fiber cladding pumping fiber laser. 3. A mathematical model for the thermodynamics study of silicon dioxide single-component soot layer is proposed based on the interface energy theory. The phase transition and microparticle growth of silicon dioxide in MCVD method are analyzed, and the influence of deposition temperature and reaction rate on soot layer is obtained theoretically for the first time. The results indicate that lower in deposition temperature and higher in reaction rate can lead to a favorable soot tissue with high porosity and good looseness.
Keywords/Search Tags:optical fiber communication, erbium doped fiber, MCVD method, D-shape fiber, fiber laser, interface energy theory, soot layer
PDF Full Text Request
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