Stock for short：长盈通
Stock code：688143

MCVD is the abbreviation of Modified Chemical Vapor Deposition, which is translated as improved chemical vapor deposition. The production method of preform was first proposed by Bell Laboratories in the United States and Southampton University in the early 1970s, and invented by Bell Laboratories in the United States in 1973.

In view of the strong flexibility of MCVD equipment in preparing different kinds of preforms, it has become one of the four main methods to produce high-quality preforms for communication optic fibers, and has a wide range of applications in the field of manufacturing special optic fiber preforms for sensing and laser.

MCVD method can deposit higher purity silicon dioxide (SiO2) on the inner wall of quartz tube (commonly called liner tube) of high quality (high purity, low moisture, and low impurity). Other high-purity substances that can change the refractive index or vitreous viscosity, such as germanium dioxide (GeO2), phosphorus pentoxide (P2O5), silicon oxide fluoride (SiOF2), etc. are doped to form cores and cladding with different refractive indices, so as to achiev