该系统实现了原信号的细节分量和近似分量的交替输出；
The detail component and the approximation of the input signal are available alternately.
根据光波导理论，推算出弱导条件下光沿光纤传输场的标量近似解，给出场的各分量表达式，以便分析讨论。
Using wave guide theory, we deduce scalar approximate solution about transmissive light through a fiber weak-guide and give the expressions of field in each component.
在光束传输法中只分析前向亥姆霍兹方程，而后向分量近似为零。
Only positive Helmholtz equation is considered in beam propagation method, while the negative component is approximately zero.
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