The coupling is between forward - propagating core fundamental modes and forward - propagating cladding modes 其耦合機(jī)理是前向傳輸?shù)睦w芯基模與前向傳輸?shù)母麟A包層模式之間的耦合。
Furthermore , we analyze fiber bragg grating of a constant refractive index modulation and period , found the coupled - mode equations that describe interactions between the forward - propagating guided core mode and the backward - propagating guided core mode itself 并用耦合模理論對(duì)最簡(jiǎn)單的均勻光纖布拉格光柵進(jìn)行分析,建立其耦合模方程,并給出解析解。