求翻译：考虑在长周期光纤光栅中传播常数为 的纤芯基模LP01和以传播常数为 的第m阶包层模LP0m之间的模式耦合，纤芯模、包层模和光栅的传播常数间遵守动量守恒关系，即是什么意思？

Consider the mode coupling between the propagation constant for a long period fiber grating lp01 core fundamental mode and the propagation constant for the m-th order cladding mode lp0m, to comply with the momentum between the core mode and cladding mode and the propagation constant of the grating c

Taking into account the long-cycle in fiber Bragg grating for the constant communication core LP 01 base model for the dissemination and the constant of the first M-package level 0 template LP M mode coupling between the core and mold, mold and the grid between the constant compliance with play, tha

Consideration in long period optical fiber diffraction grating propagation constant for core base mold LP01 and take propagation constant as m between the step envelope mold LP0m pattern coupling, the core mold, the envelope mold and the diffraction grating propagation constant observes the conserva

Considering the propagation constant is in long-period fiber grating core archetypes LP01 and m-order of the propagation constant for cladding mode coupling between the model LP0m, mould core, cladding mode, the propagation constant of grating to comply with conservation of momentum, namely,

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