Font Size: a A A

Magneto-optical Fiber Bragg Grating Birefringence And Magnetic Tunability

Posted on:2012-12-08Degree:MasterType:Thesis
Country:ChinaCandidate:C Z LiFull Text:PDF
GTID:2208330332486780Subject:Optical Engineering
Abstract/Summary:PDF Full Text Request
Magneto-optical Fiber Bragg Grating (MFBG) has a great potential application in the field of optical fiber sensor due to its magnetic adjustability of photonic band-gap. This paper deeply investigated the MFBG's birefringence and its magnetic adjustability of photonic band-gap in theory and experiment. The research works are as follow:1. According to the coupled-mode perturbation theory, the coupled-mode equation for the linearly birefringent MFBG is deduced. The analytic expression for the complex envelope of the guided optical wave is acquired, which can be used to investigate many characteristics of MFBG, such as transmission/reflection, photonic band-gap, eigenmode.2. The impact of linear birefringence and magnetically circular birefringence on the evolution of guided optical waves in the MFBG is theoretically investigated. The relationship between MFBG's photonic band-gap and its PDL is revealed, which underlies the experiment on PDL.3. The PDL values of the silica fiber Bragg grating (FBG) under different magnetic field are measured experimentally. It is shown by Jones matrix method that the use of the fiber polarization controller (FPC) can compensate for the MFBG's linear birefringence, which is useful for efficiently improving the sensitivity of the MFBG's response to magnetic field.4. We for the first time employ"reverse edge filtering method"to measure the variation of transmitted optical power of Er-doped fiber Bragg grating with applied magnetic field. Based on the experimental data, we retrospectively deduce the effective Verdet constant of the Er-doped fiber Bragg grating, about 12.66 rad/( T·m).
Keywords/Search Tags:Magneto-optic fiber Bragg grating (MFBG), linear birefringence, polarization dependent loss (PDL), Verdet constant, reverse edge filtering method
PDF Full Text Request
Related items