LARGE DIAMETER CORE MULTIMODE OPTICAL FIBER

摘要

PROBLEM TO BE SOLVED: To provide multimode optical fibers produced by improved methods that reduce the manufacturing cost.SOLUTION: Methods according to the present invention may also be more efficient in terms of power loss. In one of the embodiments, the improved design has a large diameter core of pure silica derived from a rod-in-tube method. In the embodiment, a down-doped cladding is produced by depositing fluorine-doped silica on the inside of a silica starting tube using isothermal radio frequency plasma deposition. A silica core is inserted and the starting tube is collapsed. The silica starting tube is removed and optical fiber is drawn from the fluorine-doped glass coated silica rod.