It is because that the coupling term due to polarization and the ignored term due to the weakly guiding approximation are as small as the second order, and they are just the same.
最后认为这是由于偏振耦合项是二阶小量，而弱导近似忽略了与之相等的二阶小量耦合项。
It is because that the coupling term due to polarization and the ignored term due to the weakly guiding approximation are as small as the second order, and they are just the same.
最后认为这是由于偏振耦合项是二阶小量，而弱导近似忽略了与之相等的二阶小量耦合项。
应用推荐