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You searched for subject:(double variable curvature). Showing records 1 – 2 of 2 total matches.

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NSYSU

1. Wang, Li-Jin. Effect of Curvature Radius and Offset on Coupling Efficiency in Double-Variable-Curvature Fiber Microlens.

Degree: Master, Electro-Optical Engineering, 2011, NSYSU

A study of double-variable-curvature microlenses (DVCM) for promoting coupling efficiency between the high-power 980-nm pumping laser diodes and the single-mode fibers has been proposed. In comparison with the previous works on asymmetric fiber microlenses fabricated by the multi-step processes with complicated fabrication, the advantages of the DVCM structure for achieving high coupling are a single-step fabrication, a reproducible process, and a high-yield output. In the fusing procedure, the slight arc fusion was mainly applied for fine polishing merely instead of reshaping for the reason that the fabricated double-variable-curvature fiber endface (DVCFE) was very close to the ideal shape. Hence, the fabrication time was reduced and the yield was promoted due to the withdrawn step of tip elimination. In this study, the geometric center of the fiber was defined through, the cladding diameter and the core diameter, for comparison to measure the offset. The offset measured by the core diameter was more accurate and coincidence with the coupling efficiency in the experiment. In the fabricated 45 DVCMs, to achieve the average coupling efficiencies higher than 84%, the offsets were ought to be controlled in merely less than 0.6μm with the curvature radii in the minor axis ranged from 2.4 to 2.9μm (with tolerance of 0.5μm). Alternatively, the offsets were ought to be controlled in less than 0.3μm though the curvature radii in the minor axis ranged from 2.4 to 3.7μm (with larger tolerance of 1.3μm). However, it was more difficult to control over the offsets than the curvature radii in the minor axis while fabricating the DVCMs. In conclusion, to achieve higher yield, it was relatively practical to control the offsets of fiber microlenses to be less than 0.6μm with 2.4 to 2.9μm curvature radius. As a result, the coupling efficiencies were all higher than 80%. Advisors/Committee Members: Ching-Ting Lee (chair), Yi-Cheng Hsu (chair), Ying-Chien Tsai (chair), Maw-Tyan Sheen (chair), Wood-Hi Cheng (committee member).

Subjects/Keywords: coupling; double-variable-curvature; fiber microlens

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Wang, L. (2011). Effect of Curvature Radius and Offset on Coupling Efficiency in Double-Variable-Curvature Fiber Microlens. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802111-220522

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Wang, Li-Jin. “Effect of Curvature Radius and Offset on Coupling Efficiency in Double-Variable-Curvature Fiber Microlens.” 2011. Thesis, NSYSU. Accessed January 22, 2020. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802111-220522.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Wang, Li-Jin. “Effect of Curvature Radius and Offset on Coupling Efficiency in Double-Variable-Curvature Fiber Microlens.” 2011. Web. 22 Jan 2020.

Vancouver:

Wang L. Effect of Curvature Radius and Offset on Coupling Efficiency in Double-Variable-Curvature Fiber Microlens. [Internet] [Thesis]. NSYSU; 2011. [cited 2020 Jan 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802111-220522.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang L. Effect of Curvature Radius and Offset on Coupling Efficiency in Double-Variable-Curvature Fiber Microlens. [Thesis]. NSYSU; 2011. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802111-220522

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


NSYSU

2. Liu, Yu-da. A Study of Double-Variable-Curvature Fiber Microlens.

Degree: PhD, Electro-Optical Engineering, 2011, NSYSU

A study of double-variable-curvature microlenses (DVCM) for promoting coupling efficiency between the high-power 980-nm laser diodes and the single-mode fibers has been proposed. The purpose of the fiber microlens fabrication was to make the mode field match between the laser beam and the fiber as the beam propagating through the fiber microlens. To make the mode match, the shapes of the fiber microlens demanded nothing else but the offset and the curvature radii in minor and major axes. The double-variable-curvature fiber endface (DVCFE) was manufactured through a single-step fully automation grinding process and had less average offset of 0.3μm, consequently. The radii of curvature in minor and major axis were controlled as an average of 1.2μm and 33.6μm, respectively. In the fusing procedure, the slight arc fusion was mainly applied for fine polishing merely instead of reshaping for the reason that the fabricated DVCFE was very close to the ideal shape. Hence, the fabrication time was reduced and the yield was promoted due to the withdrawn step of tip elimination. Furthermore, while the fusion parameters were set to be: fusing distance: 10μm, arc intensity: 3bits, and fusing time: 200ms in the slight fusion process, the offset was reduced to 0.2μm due to the shape constraint and surface tension of the DVCFE. And the radii of curvature increased 1.7μm to 2.9μm in the minor axis and increased 4.5μm to 38.1μm in the major axis, respectively. Owing to the controls of the fully automated grinding procedure and the omission of the tip elimination, the coupling efficiency and yield were improved. As a result, in the experiment, the average and maximum coupling efficiency of 83% and 88% were demonstrated, respectively. And the coupling efficiencies of the 20 samples were higher than 80%. In other words, the proposed DVCM structure of this study was a high coupling efficiency, a high yield output, and reproducible and fully automated single-step grinding process. Advisors/Committee Members: Ching-Fuh Lin (chair), Shoou-Jinn Chang (chair), Jye-Hong Chen (chair), Ying-Chien Tsai (committee member), Hai-Han Lu (chair), Sheng-Lung Huang (chair), Shiuh Chao (chair), Wood-Hi Cheng (committee member), Way-Seen Wang (chair).

Subjects/Keywords: coupling; double-variable-curvature; pumping laser; fiber microlens; high power

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Liu, Y. (2011). A Study of Double-Variable-Curvature Fiber Microlens. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0117111-143147

Chicago Manual of Style (16th Edition):

Liu, Yu-da. “A Study of Double-Variable-Curvature Fiber Microlens.” 2011. Doctoral Dissertation, NSYSU. Accessed January 22, 2020. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0117111-143147.

MLA Handbook (7th Edition):

Liu, Yu-da. “A Study of Double-Variable-Curvature Fiber Microlens.” 2011. Web. 22 Jan 2020.

Vancouver:

Liu Y. A Study of Double-Variable-Curvature Fiber Microlens. [Internet] [Doctoral dissertation]. NSYSU; 2011. [cited 2020 Jan 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0117111-143147.

Council of Science Editors:

Liu Y. A Study of Double-Variable-Curvature Fiber Microlens. [Doctoral Dissertation]. NSYSU; 2011. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0117111-143147

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