提出了用级联方向耦合器组成光纤反射器的设想，给出了其基本结构形式，推导了各种结构的光场量和强度的反射和传输系数，并对其特性进行了分析和比较 The idea of ​​using a cascaded directional coupler to form an optical fiber reflector is proposed. The basic structure of the fiber reflector is given. The reflection and transmission coefficients of the light intensity and the amount of light field are deduced. Their characteristics are also analyzed and compared