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直接从电磁场的普遍原理——共轭互易定理出发,针对无损折射率双缓变光纤,得到了双缓变光纤模耦合方程,推导出了互耦合系数、自耦合系数、干涉耦合系数和传播常数之间关系。在此基础上,对模耦合方程进行了求解,得到了相同双缓变光纤模耦合方程的近似解析解,讨论了耦合系数对光功率耦合的影响。
Starting from the universal principle of electromagnetic field, the conjugate reciprocity theorem, a double-mode optical fiber mode coupling equation is obtained for a lossless refractive index double-retardation fiber. The mutual coupling coefficient, self-coupling coefficient, interference coupling coefficient and propagation Relationship between constants. Based on this, the approximate analytical solution of the mode coupling equation with the same double-retardation is obtained, and the influence of the coupling coefficient on the optical power coupling is discussed.