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1·The image of a taper-like defocusing GIRN fiber lens is studied by the method of equivalent taper. This method is easy to be used to calculate the gaussian parameters, and of some applicability.

本文采用等效锥形的方法研究了一种类锥形发散梯度折射率纤维的近轴成象，这种方法计算方便，且有一定的适用性。