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介绍了在小相移及大相移不同工作情况下，Ｍａｃｈ－Ｚｅｈｎｄｅｒ光纤干涉仪可能达到的动态范围和限制动态范围增加的因素．着重分析了在采用相位产生载波（ＰＧＣ）的调制解调技术时，限制系统动态范围上限的主要因素．特别指出，待检测信号幅度越大，要求系统带宽越宽．文中揭示了载波和低通滤波器截止特性与待检测信号的幅度频率积的相互关联性及其对干涉仪动态范围上限的影响，得到的有关研究结论与实验结果符合的很好，可以作为双光束光纤干涉仪ＰＧＣ零差检测系统的设计与应用的理论依据和参考．
The possible dynamic range and limited dynamic range of the Mach-Zehnder fiber interferometer are introduced under different working conditions of small phase shift and large phase shift. The main factors that limit the upper limit of the system dynamic range are emphatically analyzed when using the modulation and demodulation technology of phase generating carrier (PGC). In particular, the greater the amplitude of the signal to be detected, the wider the system bandwidth is required. The paper reveals the correlation between the cut-off characteristics of carrier and low-pass filter and the amplitude-frequency product of the signal to be detected and its influence on the upper limit of the dynamic range of the interferometer. The conclusions of the research are in good agreement with the experimental results and can be used as bis Theoretical Basis and Reference of Design and Application of Optical Fiber Optical Interferometer PGC Zero Difference Detection System.