求翻译：1996年 Erdogann[11]根据模式耦合理论分析了长周期光纤光栅的光谱特性，奠定了长周期光纤光栅的理论基础。LPFG的谐振波长不仅与纤芯的参数有关,而且还与纤芯和包层的折射率差有关。图9.15给出了平均折射率调制深度为 =9.45×10-5，光栅长度为 10mm的长周期光纤光栅的透射谱，其谱宽约为20nm，是FBG谱宽的几百倍。是什么意思？

1996 erdogann [11] according to the mode coupling theory analysis of the spectral characteristics of long period fiber grating, laid the theoretical basis of the long period fiber grating. lpfg the resonant wavelength is not only the parameters of the core, but also related to the core and the cladd

In 1996 [ 11] Erdogann mode coupling based on analysis of the long cycle theory Fiber Bragg grating spectral characteristics and the foundations of the long cycle theory of fiber Bragg grating based. The resonant wavelength LPFG core not only with the parameters, but also with the core and cladding

In 1996 the Erdogann(11) basis pattern coupling theoretical analysis long period optical fiber diffraction grating spectral characteristic, has laid the long period optical fiber diffraction grating rationale.Not only LPFG resonant wave length with core parameter related, moreover also concerns with

1996 Erdogann[11] according to the mode-coupling theory analysis of spectral properties of long-period fiber grating, laid the theoretical foundation of long-period fiber grating. LPFG resonant wavelengths are not only associated with fiber core parameters, but also with the fiber core and cladding

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