介绍了一种新的改进化学气相沉积法（MCVD）+气相轴向沉积法（VAD）预制棒制备工艺，该工艺按照归一化波导结构进行工艺设计和参数控制，即采用MCVD法制备归一化结构参数轴向一致的芯棒，然后采用VAD法轴向沉积相应的外包层，从而得到波导结构轴向均匀一致的预制棒。采用新工艺实验研究了非零色散位移光纤的制造过程，成功制造了波导结构均匀的光纤预制棒，有效地利用预制棒的锥度增加有效长度，光纤的生产效率提高约15%，节省了成本。详细分析了该工艺方法的三个关键环节：芯棒归一化结构制备，芯棒收缩比的设定，VAD松散体沉积。研究结果对非零色散位移光纤的生产具有实际的指导意义。

A novel preform fabrication process for non-zero dispersion-shifted fibers using hybrid modified chemical vapor deposition (MCVD)+ vapor axial deposition (VAD) technique is presented. The new design concept of the hybrid process is based on the normalized waveguide structure of the fiber, whereby fabricating core preforms with homogeneous normalized waveguide using MCVD process and out-cladding using axis control technique via VAD process to realize a homogeneous waveguide along axis of the preform. The manufacturing process of non-zero dispersion-shifted fibers is experimentally studied and the results show that preforms with homogeneous waveguide are fabricated successfully, with effective use of the taper of the preforms to increase the preform length, achieving about 15% increase of fiber production efficiency and cost reduction. Three key procedures in the hybrid fabrication process are discussed in detail, including the fabrication of normalized structure, the initialization of constriction ratio of core preform and the soot deposition via VAD process. The results provide a useful guideline for practical fabrication of non-zero dispersion-shifted fibers.