.Coupling constant of triple-clad long-period fiber grating[J].Optoelectronics Letters,2006,2(1):27-30 |
Coupling constant of triple-clad long-period fiber grating |
GU Zheng-tian XU Yan-ping CHEN Jia-bi |
Laboratory of Photo-electric Functional Films, University of Shanghai for Science and Technology, Shanghai 200093, China |
Abstract: |
Based on the method of vector-field analysis, the relationship between the core-mode/cladding-mode coupling constantk
1v-11cl-co and mode orderv is studied. It could be seen that the coupling constants of thel=1 low-orderHE cladding modes are larger than that of thel=1 low-orderEH cladding modes whenv≤41. For cladding modes withv>41, the coupling constants of thel=1 low-orderHE andEH modes are comparable to reach other. The plotted local intensity curves of the six lowest-order (l=1) cladding modes show that the low-orderHE modes have a larger proportion of intensity located in the core than the low-orderEH modes. Further, the relationship between the coupling constantk
1v-11cl-co and the film refractive index as well as the film thickness is studied. The results indicate that the coupling constant changes
monotonously with the film refractive index changing. As the film thickness increases, the coupling constant decreases slowly
with irregularly changes in a certain region of the film thickness, which matches the experimental results of Nicholas D.
R.
Supported by Shu Guang Project (No: 02SG32) of the Education Committee of Shanghai and Shanghai Leading Academic Discipline
Project (No: T0501) |
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