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Study On Polarization And Magneto-Optical Properties In Conventional Optical Fibers And Photonic Crystal Fibers

Posted on:2008-08-16Degree:DoctorType:Dissertation
Country:ChinaCandidate:Y A LiFull Text:PDF
GTID:1118360215464798Subject:Optics
Abstract/Summary:PDF Full Text Request
The technology of optical fiber is important leading edge in information technology field. The polarization and magnetic rotation in the optical fibers have important value for theory and application. The investigation about the polarization and magnetic rotation in the optical fiber have important value and influence to optical fibre communication, optical fibre sensing, and so on. The investigation about the polarization and magnetic rotation in conventional optical fibers and in photonic crystal fibers, and the investigation about the magneto-optical modulation had been done by author during his studying for doctor degree will be introduced in this thesis.The main contents of this thesis are following:1. The investigation significance for polarization in conventional optical fibers and in photonic crystal fibers was introduced. The progress and the present situation of investigation about the magnetic rotation in optical fibers were looked back and were introduced. The progress and the present situation of investigation about magneto-optical modulation were introduced.2. The investigation history and the relevant theory of polarization and magnetic rotation in conventional optical fibers were introduced. And the present situation and prospect of polarization and magnetic rotation in conventional optical fibers in application were introduced. The polarization in graded-index multimode fibers was discussed theoretically, and the polarization effect in the graded-index multimode fiber was researched with classical extinction by investigating temperature characteristic and investigating spectral characteristic. The polarization and magnetic rotation in some visible step-index single-mode fibers were investigated by frequency multiplication method based on the principle of magneto-optical modulation and with Lissajous figure method. The frequency compensated effect of polarization of single-mode fibers was found when polarization orienttation of linearly polarized input light was rotated rapidly in small angle, and this effect was discussed tentatively.3. The principle and priperties of photonic crystal fibers, the development of thoery research of photonic crystal fibers were introduced. The present situation and prospect of photonic crystal fibers in application were introduced. The relevant investigation about polarization in photonic crystal fibers was introduced. The polarization and magnetic rotation in highly nonlinear photonic crystal fibers were investigated by frequency multiplication method based on the principle of magneto-optical modulation, joining with Lissajous figure method, and by investigating temperature characteristic and spectral characteristic. On the basis of analyzing the properties of highly nonlinear photonic crystal fibers, the conception about large mode area photonic crystal fibers made with magneto-optical material was put forward.4. The basic conception of magneto-optical modulation was introduced. Based on the principle of magneto-optical modulation and joining to Lissajous figure method, the sine wave magneto-optical modulation, the triangular wave magneto-optical modulation, the saw-tooth wave magneto-optical modulation, and the rectangular wave magneto-optical modulation were modeled by computer. And the relevant properties of sine wave magneto-optical modulation with partial polarized input light were modeled especially. On the basis of computer modeling, the small angle approximating in sine wave magneto-optical modulation was discussed. And a conclusion that the small angle approximating is the precondition of sine wave magneto-optical modulation, and the constraint on angle can be relaxed applicably when sine wave magneto-optical modulation be used in measuring polarization was gained. On the basis of computer modeling and experiment, the sine wave magneto-optical modulation and the rectangular wave magneto-optical modulation were analyzed by comparing. And a conclusion that the rectangular wave magneto-optical modulation has a great value and a fine prospect in application was gained. The amplitude limited effect in sine wave magneto-optical modulation and in rectangular wave magneto-optical modulation was found in experiments and was discussed tentatively.5. The properties about three visible step-index single-mode fibers and the highly nonlinear photonic crystal fibers were researched when these fibers were used as medium of magneto-optical modulation. The possibility, the merit and defect for the graded-index multimode fibers, the visible step-index single-mode fibers and the highly nonlinear photonic crystal fibers were discussed when these fibers be used as medium of magneto-optical modulation. The amplitude limited effect in magneto-optical modulation was discussed and analyzed as a whole.6. The theory research and technology research about polarization and magnetic rotation in fibers were forecasted, and the theory research and technology research about polarization and magnetic rotation in photonic crystal fibers were forecasted especially. The studying orientation and outlook about magneto-optical modulation were analyzed.
Keywords/Search Tags:Polarization, Magnetic Rotation, Magneto-optical Modulation, Conventional Optical Fibers, Photonic Crystal Fibers, Amplitude Limited Effect, Frequency Compensated Effect
PDF Full Text Request
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