An Improved Method of Fabricating Rare Earth Doped Optical Fiber

Sen, Ranjan; Dhar, Anirban

doi:10.5772/28734

Cited by 12 publications

(8 citation statements)

References 22 publications

(15 reference statements)

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“…A number of methods were followed to incorporate Yb +3 ions into silica glass, most of which are alterations of the conventional modified chemical vapor deposition (MCVD) process. Two of the most common techniques are solution doping method [9], [10] and vapor phase doping technique [11]- [18]. Till date, solution doping method is the most popular due to its simple operational scheme and wide range of selectivity of dopants.…”

Section: Introductionmentioning

confidence: 99%

An Optimized Vapor Phase Doping Process to Fabricate Large Core Yb-Doped Fibers

Saha

Pal

et al. 2015

J. Lightwave Technol.

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The paper demonstrates a standardized process of vapor phase doping to fabricate large core Yb-doped preforms with longer useful length in reproducible manner. The optimization of the process led to successful achievement of Yb-doped core thickness of 4.5 mm (in 14.8 mm of preform diameter) by depositing up to 30 number of core layers with controlled amount of generated precursor vapors. The influence of the process parameters was studied rigorously to enhance the useful preform length up to 380 mm. A combination of Yb and Al in different proportions was doped into the core with uniform dopant concentration along the length by adjusting few process parameters efficiently. The Al 2 O 3 concentration up to the level of 17.8 mol% has been achieved successfully which resulted in NA of 0.31. This is the highest ever doping of Al in passive fibers by any modified chemical vapor deposition process. The Yb 2 O 3 content in the active fibers is as high as 0.47 mol%.

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Section: Introductionmentioning

confidence: 99%

An Optimized Vapor Phase Doping Process to Fabricate Large Core Yb-Doped Fibers

Saha

Pal

et al. 2015

J. Lightwave Technol.

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“…Large core Yb 2 O 3 doped preforms are fabricated through deposition of multiple porous layers (6)(7)(8)(9)(10)(11)(12) at several deposition temperatures (1310-1515°C) with variation of pre-sintering temperature from 1300 to 1450°C followed by solution doping technique using suitable strength of the dopant precursors to get the optimized process parameters for making of fibre with NA around 0.09-0.11. Each porous soot layer was deposited inside the substrate silica tube (20 mm OD and 17 mm ID) by the conventional MCVD technique through forward direction under suitable gas phase mixture of SiCl 4 , POCl 3 , O 2 and He within the silica tube as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Among the various processes, the solution doping technique is mostly used for incorporation of rare earths (RE) into the silica core. A details study was done about the process parameters for making of rare-earth doped single mode fibre by the solution doping technique [3][4][5][6][7][8][9][10][11][12]. However, making of large core preforms by this process is difficult since the soaking of a thick porous layer gives rise to multiple problems.…”

Section: Introductionmentioning

confidence: 99%

Study of the fabrication parameters of large core Yb2O3 doped optical fibre through solution doping technique

Paul

Upadhyaya

Das

et al. 2010

Optics Communications

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“…A number of methods have been followed to incorporate RE ions into the silica glass structure, among them solution doping method [5,6] is the most popular due to its simplicity and versatility. However, it suffers from poor repeatability and reached its limit regarding increase of core diameter [7] which is essential for high power fiber laser.…”

Section: Introductionmentioning

confidence: 99%

Vapor Phase Doping of Rare-Earth in Optical Fibers for High Power Laser

Saha

Pal

Sen

2014

IEEE Photon. Technol. Lett.

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This letter describes an optimized vapor phase doping technique using modified chemical vapor deposition system to fabricate rare-earth doped optical fibers for a high power laser. The process comprises deposition of aluminium oxide and ytterbium oxide in vapor phase simultaneously in combination with silica during formation of the core layer. The process parameters have been judiciously controlled to deliver aluminium chloride and rare-earth-chelate compounds to the reaction zone without decomposition and/or condensation of the precursor materials prior to the reaction zone. The standardization of the process parameters resulted in a good repeatability with a very low (< 1%) variation of dopant concentrations throughout the length of the preform. The fabricated fibers exhibit good optical properties with lasing efficiency of 76% at 1.06 µm.

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An Improved Method of Fabricating Rare Earth Doped Optical Fiber

Cited by 12 publications

References 22 publications

An Optimized Vapor Phase Doping Process to Fabricate Large Core Yb-Doped Fibers

An Optimized Vapor Phase Doping Process to Fabricate Large Core Yb-Doped Fibers

Study of the fabrication parameters of large core Yb2O3 doped optical fibre through solution doping technique

Vapor Phase Doping of Rare-Earth in Optical Fibers for High Power Laser

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