Explanation

optical fiber made of quartze glass (SiO2). In order to solve the problem of low loss, silica fiber is synthesized from ultrapure chemical raw materials at high temperature, and chemical vapor deposition is commonly used. optical fiber manufacturing process includes purification process, melting process and wire drawing process. Purification refers to the use of multiple rectification and other methods to make the purity of raw materials reach 99.999%. The melting process is to synthesize preforms with a certain refractive index distribution from ultra pure chemical raw materials through high-temperature chemical reaction. The common methods for manufacturing optical fiber preforms are the improved chemical vapor deposition (Mcvd) method, plasma chemical vapor deposition (Pcvd) method, gas axial deposition (Vad) method, and external vapor deposition (CVD) method. MCVD, PCVD, and both methods belong to the in tube method. The characteristics of in tube chemical vapor deposition method are as follows: cladding and core layer glass are deposited successively on the inner wall of quartze substrate tube, and the whole chemical reaction is carried out in a closed quartze tube, It can deposit larger diameter preforms, which is suitable for large-scale production. The drawing process is to draw the preforms into high-quality optical fiber. Because of the advantages of silica fiber, such as low absorption loss, low scattering loss, no phase separation, good chemical stability, etc., it is now the most important transmission medium materials for optical fiber communication. silica fiber is also used in optical fiber sensing and optical information processing.

Classification