A burner design has been proposed to improve the manufacturing yield of optical fiber. The burner is an important device to fabricate the soot preforms in ACVD process which leads to draw optical fiber in subsequent manufacturing process. The glass formation at the tip of burner fumes tube is a common defect which leads to scrap soot preform. The burner has been redesigned using Computational Fluid Dynamics (CFD) simulation software to understand the interaction of silica precursor, hydrogen and oxygen gas flow paths and to avoid glass formation.