| 发明名称 |
Method of forming a fiber preform to minimize shifts of the zero-dispersion wavelength |
| 摘要 |
An improvement is proposed, in a method for the preparation of a step-index silica glass preform as a precursor of optical fibers by completing the cladding layer of the secondary preform by the outer deposition on and around a primary preform consisting of the center core and side core, to conduct the outer deposition for the cladding layer in such a way that the inequality|d lambda 0/dk|</=500 nmis satisfied, in which k is the ratio of the diameter of the primary preform to the diameter of the secondary preform and lambda 0 is the zero-dispersion wavelength in nm of an optical fiber obtained by drawing the secondary preform, d lambda 0/dk being the differential of a function held between lambda 0 and k determined beforehand from the distribution of the refractive index within the primary preform. When the outer deposition is performed in this way, a great improvement can be obtained in the uniformity of the zero-dispersion wavelength of the optical fiber prepared by drawing the preform.
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| 申请公布号 |
US5683486(A) |
申请公布日期 |
1997.11.04 |
| 申请号 |
US19940358529 |
申请日期 |
1994.12.19 |
| 申请人 |
SHIN-ETSU CHEMICAL CO., LTD. |
发明人 |
OYAMADA, HIROSHI;OGINO, GO;HIRASAWA, HIDEO |
| 分类号 |
C03B37/012;C03B37/014;(IPC1-7):C03B37/027 |
主分类号 |
C03B37/012 |
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