提出一种新型的光纤干涉仪 ,它是采用二个 3× 3单模光纤耦合器组成三光纤系统的马赫 -曾德尔 (Mach- Zehnder)干涉仪 ,当干涉仪的三条光纤干涉臂两两之间分别存在长度差Δ L和2Δ L时 ,干涉仪形成了一个波分复用间隔相等的三波分复用器 ,波分复用的波长间隔仅仅取决于ΔL的大小。实验样品的使用波段为 1.55μm,波长复用间隔为 1.6 nm,附加损耗为 0 .6 d B。 A new type of optical fiber interferometer is proposed, which is a Mach-Zehnder interferometer consisting of three 3 × 3 single-mode fiber couplers. When the three optical fiber interfering arms of the interferometer pair up When there is length difference ΔL and 2ΔL respectively, the interferometer forms a three-wavelength multiplexer with the same wavelength division multiplexing interval. The wavelength division multiplexing is only determined by the size of ΔL. The wavelength of the experimental sample is 1.55 μm, the wavelength multiplexing interval is 1.6 nm, and the additional loss is 0.6 dB.