Silica-based Optical Fibers with Low Rayleigh Scattering.
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Accession number;03A0049485
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| Title;Silica-based Optical Fibers with Low Rayleigh Scattering. |
| Author;
TSUJIKAWA KYOZO
(Nippon Telegraph and Telephone Corp. (NTT), Access Network Serv. Systems Lab., JPN)
TAJIMA KATSUSUKE
(Nippon Telegraph and Telephone Corp. (NTT), Access Network Serv. Systems Lab., JPN)
OHASHI MASAHARU
(Osaka Prefecture Univ., Graduate School Div. Engineering, JPN)
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Journal Title;IEICE Transactions on Communications (Japanese Edition)
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Journal Code:S0622C
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ISSN:1344-4697
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VOL.J86-B;NO.1;PAGE.1-12(2003)
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| Figure&Table&Reference;FIG.13, TBL.2, REF.45 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Experimental investigation on reducing method of Rayleigh scattering (RS) loss on quartz optical fibers (QOFs) prepared by using VAD method was carried out. On a base evaluation results of RS features on bulk of quartz fibers doped by phosphorus pentoxides (P2O5), germanium dioxide (GeO2), and fluorine (F), reducing method of RS loss of QOFs was investigated. On P2O5-doped quartz fibers (P2O5-SiO2), low RS value corresponding to about 80% of pure quartz glass (SiO2) value could be obtained. Then, by using a method carrying out optimization of compositions of mather materials considering both RS loss and structural irregularity loss, it could be established to prepare P2O5-doped quartz core optical fibers with low loss of 0.67 dB/km/micron(exp 4) in RS coefficient and 0.29 dB/km in loss at 1.31 micron in wavelength. On the other hand, RS coefficient of GeO2-F-doped quartz fibers (GeO2-F-SiO2) increased in proportion to concentration of GeO2 and also to square of concentration of F. And, it was confirmed that when reheating these glass to 1,800 centigrade, RS coefficient increased by about 10%. This was caused by increasing density fluctuation based on thermal treatment in proportion to imaginary temperature. On a base of this result, by a method carrying out wiredrawing at lower temperature and at lower rate than those of original methods, it could be established to prepare GeO2 doped quartz core optical fibers with very low loss of 0.78 dB/km/micron(exp 4) in RS loss and 0.16 dB/km in loss at 1.55 micron in wavelength. Two RS reduction methods used in this investigation could be expected mutually additive effect based on parallel using and wide applicability to whole of QOFs, because of basing on both reduction of imaginary temperature. |
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