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Multi-Mode Coupling in Long-Period Fibre Gratings |
| LIU Zi-Xi;YANG Chang-Xi |
| Department of Precision Instruments, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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LIU Zi-Xi, YANG Chang-Xi 2004 Chin. Phys. Lett. 21 1549-1552 |
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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.
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| Keywords:
42.79.Dj
42.81.Qb
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Published: 01 August 2004
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