【摘要】 根据耦合模理论及模耦合方程推导了长周期光纤光栅的透射系数、反射比和级联长周期光纤光栅的透射系数表达式,用Matlab对其进行仿真研究,并总结了长周期光纤光栅透射谱特性随光栅长度、周期及耦合系数的变化规律,通过仿真实验验证了系统特性。更多还原

【Abstract】 Transmission coefficient and reflection ratio of long period grating and expression of transmission coefficient of cascaded long period grating are derived by using the coupled mode theory and coupled mode equation.Then Matlab is used to simulate the result and law of change of long period fiber grating’s transmitted spectrum along with length,period and coupling coefficient is generalized.Through simulating experiment,the characteristics of the system are verified.更多还原