| 摘要 |
A method is disclosed of fabricating an optical fiber doped with a rare earth component using a volatile complex, which flattens the light frequency response under a stimulated emission of radiation principle using a modified chemical vapor deposition method. Silicon tetrachloride (SiCl 4 ) and oxygen are injected into a quartz reaction tube under a heating process, so that a cladding layer is repeatedly deposited. Then, a volatile organic metal chelate, silicon tetrachloride and oxygen are injected into the quartz reaction tube, and heated and water-cooled to form a porous layer. At the same time, a rare earth element is deposited on the porous layer, to thereby form a core layer. Thereafter, via a high heating process, a preform is completed. Then, an optical fiber is obtained from the preform via a drawing-out process. Here, hydroxide ions (OH* box - middle top *) which occur as the organic ligand is volatilized and cause an optical loss of the optical fiber and removed as the porous layer is formed by the water-cooling, and an added rare earth content is easily controlled, so that the rare earth with high concentration is evenly distributed. Also, since the core layer adopts SiO 2 and Al 2 O 3 as a host material instead of GeO 2 , the difference in a refractive index between the cladding and core layers becomes greater then 0.015, to thereby provide the optical fiber with excellent optical characteristics. |
