提出了在单模光纤联接的望远镜干涉阵中通过拉伸红外单模光纤实现光程调制的方法.简要分析了该方法的机理及存在的问题，如偏振效应、色散等.用少模光纤和单模光纤分别代替马赫-陈德尔(Mach-Zehnder)干涉仪的两个臂，并且其中一臂的光纤缠在直径为6 cm的PZT圆柱上.给PZT圆柱施加三角波电压后，首次得到干涉条纹，并证明了方法的可行性.

In this paper, a method is proposed, in which the optical path modulations in a fiber-linked telescope array can be generated by stretching fiber arms. The mechanism of this method and the problems introduced by stretching fibers, such as polarization effects,dispersion effects, are analysed. To demonstrate this method, an experimental setup is established in which the two arms of a Mach-Zehnder interferometer are replaced by two pieces of fibers. One iR glass fiber arm is wrapped onto a piezoelectric tube. Another silicon fiber arm is wrapped freely. Experiments have been done. Experimental results are briefly discussed.