发明名称 |
METHODS FOR PRODUCING OPTICAL FIBER PREFORMS WITH LOW INDEX TRENCHES |
摘要 |
Methods for forming optical fiber preforms with low-index trenches are disclosed. According to one embodiment, the method includes depositing silica-based glass soot on a bait rod to form a low-index trench region of the optical fiber preform. The silica-based glass soot is deposited such that the low-index trench region has a first density. Thereafter a barrier layer having a second density greater than the first density is formed around the low-index trench region. Therafter, an overclad region is deposited around the barrier layer. The bait rod is then removed from a central channel of the trench-overclad assembly. A separate core assembly is inserted into the central channel. A down-dopant gas is then directed through the central channel of the trench-overclad assembly as the trench-overclad assembly is heated to dope the low-index trench region. The barrier layer prevents diffusion of the down-dopant from the low-index trench region into the overclad region. |
申请公布号 |
EP2726422(A1) |
申请公布日期 |
2014.05.07 |
申请号 |
EP20120727759 |
申请日期 |
2012.06.08 |
申请人 |
CORNING INCORPORATED |
发明人 |
DAWES, STEVEN BRUCE;KNOWLTON, ROBERT A;TANDON, PUSHKAR;WANG, JI |
分类号 |
C03B37/012;C03B37/014 |
主分类号 |
C03B37/012 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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