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提出了用级联方向耦合器组成的双端口全光纤反射器的设想，给出了基本结构形式，推导了光场量和强度的反射与传输系数，并对其特性进行了分析和比较
A double-port all-fiber reflector composed of cascaded directional couplers is proposed. The basic structural forms are given. The reflection and transmission coefficients of the light quantity and intensity are deduced. Their characteristics are analyzed and compared