传感器部位上的下行波场被正向传播到水底，产生水底处的下行 波场（46）。

The down-going wavefield at the sensor position is forward propagated to the water bottom, resulting in a down-going wavefield at the water bottom (46).

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然后对本授导算法中的信号正向传播与误差反向传播两个过程，以及其中的信号值推演、误差值推演进行了分析和阐述。

Then the algorithm of the Tutoring positive signal propagation and error back-propagation of two processes, and in which the signal value deduction, deduction for error analysis and elaboration.

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以此为基础，详细研究了光敏内包层对该类型光栅中存在的正向传播的纤芯基模与反向传播的纤芯基模以及与反向传播的包层模之间的耦合的影响。

Based on this, we study the photosensitive inner cladding's influence on the core-mode-core-mode coupling and the core-mode-cladding-mode coupling in this kind of grating.

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