Method for manufacturing optical fiber preform

A method for manufacturing an optical fiber preform, comprising

• supporting at least one end of an optical fiber preform with a gripping portion;
• heating the optical fiber preform while rotating to process the optical fiber preform;
• and
• inserting a resiliently crushable buffer material buffer material between the gripping portion and the optical fiber preform, wherein
• the resiliently crushable buffer material includes a resiliently crushable first member in contact with the optical fiber preform, and a resiliently crushable second member in contact with the gripping portion,
• a composition of the resiliently crushable first member in contact with the optical fiber preform is different from a composition of the resiliently crushable second member in contact with the gripping portion,
• the resiliently crushable first member in contact with the optical fiber preform does not contain CaCO3,
• the resiliently crushable second member in contact with the gripping portion does contain CaCO3, and
• the resiliently crushable first member in contact with the optical fiber preform contains polyimide.

A method for manufacturing an optical fiber preform, comprising

• supporting at least one end of an optical fiber preform with a gripping portion;
• heating the optical fiber preform while rotating to process the optical fiber preform;
• and
• inserting a resiliently crushable buffer material between the gripping portion and the optical fiber preform, wherein
• the resiliently crushable buffer material includes a resiliently crushable first member in contact with the optical fiber preform, and a resiliently crushable second member in contact with the gripping portion,
• a composition of the resiliently crushable first member in contact with the optical fiber preform is different from a composition of the resiliently crushable second member in contact with the gripping portion, and
• the resiliently crushable first member in contact with the optical fiber preform does not contain CaCO3,
• the resiliently crushable second member in contact with the gripping portion does contain CaCO3, and
• the resiliently crushable first member in contact with the optical fiber preform contains polyimide, and
• the resiliently crushable second member in contact with the gripping portion contains acrylonitrile butadiene rubber with the CaCO3.