Preparation method of grain pumping integrated optical fiber

The invention relates to a preparation method of a grain pumping integrated optical fiber. A grain pumping integrated optical fiber preform contains one octagonal active optical fiber preform and n round passive optical fiber preforms. The plurality of preforms with asymmetric structures are treated by a prewelding technology to obtain a uniform and stable preform combined part; after the preformcombined part is drawn into wires, active optical fibers make tight contact with passive optical fibers and are independent of the passive optical fibers. According to a wire drawing method for the grain pumping integrated optical fiber disclosed by the invention, the wire drawing control precision of the grain pumping integrated optical fiber preform can be effectively controlled; meanwhile, deformation of optical fibers can be reduced to a greater degree and the consistency of a grain pumping integrated optical fiber structure is improved. 本发明涉及种增益泵浦体化光纤的制备方法，所述增益泵浦体化光纤预制棒包含根八边形的有源光纤预制棒，n根圆形的无源光纤预制棒。将多个非对称结构的预制棒通过预熔