Fabrication and analysis of Microstructured Polymer Optical Fibers
Date Issued
2007
Date
2007
Author(s)
San, Kuo-Ching
DOI
zh-TW
Abstract
In this study, a plain drawing apparatus was assembled to fabricate the microstructured polymer optical fibers (MPOFs). We first drew the one-hole MPOFs and measured the air hole diameter (dmpof). Then, the one-layer (six-hole) MPOFs were fabricated with the same drawing conditions. The relationship between dmpof and capillary number (Ca) was illustrated. The limit of dmpof was calculated using the 3-parameter Chapman-Richards function, Furthermore, the analysis and comparison between the one-hole and six-hole patterns were conducted to fabricate the three-layer MPOFs.
For one-hole MPOF, the experimental results are listed as follows: (1) Two draw regimes: surface-tension-dominated and force-balanced were separated with the critical capillary number of Ca = 1.5 × 105. The draw regime is surface-tension-dominated for Ca < 1.5 × 105 and force-balanced for Ca > 1.5 × 105. (2) In surface-tension-dominated regime, the air hole diameter changes with Ca and reaches a limit in the force-balanced regime. (3) When MPOFs were fabricated at different Td with the same DR, the air hole diameter changes with Ca. When MPOFs were fabricated with the same draw speed (Ud) and draw ratio, the dmpof drawn from high draw temperature is smaller than that drawn from low draw temperature due to large loss of viscosity at high draw temperature. (4) With considering the experimental results, the air hole diameters of one-hole and six-hole patterns conduct to the similar values at the same draw conditions. This result was utilized in fabricating the three-layer MPOFs. (5) An endless single mode MPOF can be produced for Ca < 2×104 (collapse ratio > 33%) provided that the critical value of d/Λ = 0.45 is applied.
In error analysis, the results are list as follows: (1) At low draw speed, a MPOF with small air hole diameter can be produced. However, highly precise thermal couples and thermal controllers are required. Therefore, high draw speed is a better choice with considering the cost and fiber uniformity. (2) For low draw speed (< 20 mm/sec), Td is the major cause on the error of dmpof. For high draw speed (> 20 mm/sec), dpreform is the major cause on the error of dmpof.
In the fabrication of 3-layer MPOFs: an iteration process has be derived to determine the air hole diameter and hole spacing. The numerical results are coordinated with the experimental results. Furthermore, the air hole diameter of one-hole MPOFs fabricated with the same draw conditions is similar to the results of 3-layer MPOFs.
Subjects
抽絲比
毛細數
縮孔率
microstructured polymer optical fiber
draw ratio
Capillary number
collapse ratio
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-96-D90543001-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):00a212d525b92e021b087f57fd9f8ab4