This paper has studied the charateristics of laser diode and fiber by using gradient-index lenses with spherical end surface,optimizing coupling condition has be given in this paper.

• 本文就利用球端面梯折（梯度折射率）透镜进行半导体激光器和光纤耦合问题进行了探讨，给出了最佳耦合的条件。