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Theoretical analysis of polarization properties for tilted fiber Bragg gratings

Science china(information Sciences) 2010年第2期53卷 390-397页

作者： xu ou 1 , lu shaohua 2.& jian shuisheng 2.1 faculty of information engineering, guangdong university of technology, guangzhou 510006, china 2 Institute of Lightwave technology, Beijing Jiaotong university, Beijing 100044, china 1. faculty of information engineering Guangdong University of Technology Guangzhou 510006 China2. Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

The polarization properties for tilted fiber Bragg gratings (TFBGs) are investigated theoretically based on coupled-mode theory and Mueller matrix method. The expression of wavelength-related polarizationdependent loss (PDL) for TFBGs with different tilt angles is derived and calculated. Simulation results are compared, and the results indicate that the polarization capability of TFBGs with 45° angle is stronger than other TFBGs with smaller angles. The degree of polarization for unpolarized light passing TFBGs is also simulated to further evaluate the polarization properties for various tilt angles. In addition, the relationship between physical parameters of a TFBG and its polarization capability is discussed.

关键词： coupled-mode theory degree of polarization (DOP) Mueller matrix method polarization dependent loss (PDL) tilted fiber Bragg gratings

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Analysis of coupling from core mode to counter-propagating radiation modes in tilted fiber Bragg gratings

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Science china(information Sciences) 2010年第5期53卷 1078-1088页

作者： lu shaohua 1,2 , xu ou 1,2 , FENG SuChun 1,2 , DONG XiaoWei 1,2 , PEI Li 1,2.& jian shuisheng 1,2.1 Key Laboratory of All Optical Network & Advanced Telecommunication Network of EMC, Beijing Jiaotong university, Beijing 100044, china 2 Institute of Lightwave technology, Beijing Jiaotong university, Beijing 100044, china 1. Key Laboratory of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China2. Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

Radiation-mode coupling is stronger and more efficient in tilted fiber Bragg gratings than in other fiber gratings; it has good advantage in such fields as optical communication and optical sensors. A simplified coupled-mode theory (CMT) approach is proposed for what we believe to be the first time, whose validity is demonstrated by comparing its simulation results with that of the complete CMT equations. With the simplified CMT approach, a theoretical spectral analysis of coupling from core mode to counter-propagating radiation modes in reflective tilted fiber Bragg gratings is presented. The influence of grating length, refractive index modulation amplitude and tilt angle is exhaustively investigated on the transmission spectrum characteristics. The different dependences between s-polarized and p-polarized radiation-mode coupling on grating tilt angle are discussed, and the coupling strength of 45 -tilted gratings shows the greatest polarization dependence with the limitation of backward-propagating radiation-mode coupling.

关键词： fiber optics tilted fiber Bragg gratings coupled-mode theory radiation-mode coupling

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