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从Maxwel理论出发,给出最一般的耦合方程,在此基础上,通过一系列近似简化得出光纤光栅耦合模方程。在解耦合模方程的过程中,推导出同方向和正反方向两种情形耦合模式光功率表达式,并进一步阐述了模式之间的光功率沿着光纤方向发生转换。
Based on the Maxwel theory, the most general coupling equation is given. Based on this, a series of approximate simplifications are derived to derive the fiber grating coupled mode equations. In the process of decoupling the mode equations, the optical power expressions of the coupled modes in the same direction and in the forward and reverse directions are deduced, and the optical power between the modes is converted along the optical fiber direction.