Multi-Mode Coupling in Long-Period Fibre Gratings
LIU Zi-Xi, YANG Chang-Xi
Department of Precision Instruments, Tsinghua University, Beijing 100084
Multi-Mode Coupling in Long-Period Fibre Gratings
LIU Zi-Xi;YANG Chang-Xi
Department of Precision Instruments, Tsinghua University, Beijing 100084
关键词 ：
42.79.Dj ,
42.81.Qb
Abstract ： We report multi-mode coupling in long-period fibre gratings (LPFGs). The analytical solution to three-mode coupling equations is presented for the first time. A 3×3 transmission matrix is attained and can be used to calculate the transmission spectra of nonuniform gratings in a way much faster than direct numerical integration. It is shown that when the resonant wavelengths of cladding modes are far from each other, two-mode coupling model can still be used. Otherwise we can only choose a multi-mode coupling model. Theoretically fitting of the result from the multi-mode coupling equations agrees well with the experimental one for mechanically-induced LPFGs.
Key words ：
42.79.Dj
42.81.Qb
出版日期: 2004-08-01
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2004, Vol. 21 
