Method of fabricating optical fiber doped with rare earth element using volatile complex
First Claim
1. A method of fabricating an optical fiber preform by a modified chemical deposition method comprising:
- forming a cladding layer;
forming a porous core layer on the cladding layer by sequentially heating and actively cooling an outer surface of said cladding layer through which passes a mixture of SiCl4, O2 and at least one volatile metal organic complex comprising rare earth ions and a ligand; and
removing hydroxide ions (OH-) from said porous core layer by reacting CCl4 with additional O2, and reacting Cl2 gas obtained through the reaction between said CCl4 and said additional O2 with said hydroxide ions (OH-).
0 Assignments
0 Petitions
Accused Products
Abstract
A method 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 (SiCl4) 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 then 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-) which occur as the organic ligand is volatilized and cause an optical loss of the optical fiber is 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 laver adopts SiO2 and Al2 O3 as a host material instead of GeO2, the difference in a refractive index between the cladding and core layers becomes greater then 0.025, to thereby provide the optical fiber with excellent optical characteristics.
-
Citations
21 Claims
-
1. A method of fabricating an optical fiber preform by a modified chemical deposition method comprising:
-
forming a cladding layer; forming a porous core layer on the cladding layer by sequentially heating and actively cooling an outer surface of said cladding layer through which passes a mixture of SiCl4, O2 and at least one volatile metal organic complex comprising rare earth ions and a ligand; and removing hydroxide ions (OH-) from said porous core layer by reacting CCl4 with additional O2, and reacting Cl2 gas obtained through the reaction between said CCl4 and said additional O2 with said hydroxide ions (OH-). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method of fabricating an optical fiber preform by a modified chemical deposition method, comprising:
-
forming a cladding layer; forming a core layer on the cladding layer using SiCl4, O2 and at least one volatile metal organic complex comprising rare earth ions and a ligand; and removing hydroxide ions (OH-) from said core layer by reacting CCl4 with additional O2, and reacting Cl2 gas obtained through the reaction between said CCl4 and said additional O2 with said hydroxide ions (OH-). - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
Specification