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针对三通道波分复用技术,本文提出了一种利用三个3×3光纤耦合器级联组成的全光纤Mach-Zehnder干涉仪型三波分复用器,运用光纤传输理论和矩阵理论,得到光谱的输出表达式。通过数值模拟分析了各3×3耦合器耦合比和光纤臂长差对该三波分复用器的影响,并进行了实验。结果表明,当组成的全光纤Mach-Zehnder干涉仪型三波分复用器的三条光纤干涉臂两两之间分别存在长度差ΔL和2ΔL时,在耦合器分光比取一些定值时即可实现三波分复用功能,三端口输出谱线理想,波长间隔仅仅取决于ΔL的大小,且该器件的输出谱线对耦合器的耦合比不太敏感。实验样品采用的波段为1.55μm,波长复用间隔为0.8nm,实验所得的结果与理论相吻合。
Aiming at the three-channel wavelength division multiplexing technology, an all-fiber Mach-Zehnder interferometer type three-wavelength multiplexer composed of three 3 × 3 fiber coupler cascades is proposed in this paper. By using fiber transmission theory and matrix theory, Spectral output expression. The influence of coupling ratio of 3 × 3 couplers and fiber length difference on the three-wavelength multiplexer was analyzed by numerical simulation and experiments were carried out. The results show that when the length differences ΔL and ΔL are respectively between two pairs of three fiber-optic interfering arms of the all-fiber Mach-Zehnder interferometer type three-wavelength multiplexer, it can be realized when the coupler spectroscopic ratio takes a certain value Three-wavelength multiplexed function, ideal for three-port output spectral line, the wavelength interval depends only on the size of ΔL, and the output line of the device coupling ratio of the coupler is less sensitive. The wavelength of the experimental sample is 1.55μm and the wavelength multiplexing interval is 0.8nm. The experimental results are consistent with the theory.