An improved method of controlling rare earth incorporation in optical fiber

The process parameters involved at various stages of solution doping method for fabricating rare earth (RE) doped optical fiber have been systematically investigated to optimize the process conditions and achieve better control over RE incorporation. It is observed that the RE concentration, uniformity and the overall fiber quality are strongly influenced by the solution properties and dipping parameters. The soaking solution needs to be judiciously selected depending on the porous layer characteristics to improve the fiber quality and process efficiency. An interesting observation not hitherto reported is the influence of Al ion concentration in the solution on RE incorporation into the core. The investigation helps to obtain the optimum conditions necessary to produce fibers of given specification and achieve greater reproducibility.

[1]  N. Olsson,et al.  Erbium-Doped Fiber Amplifiers: Fundamentals and Technology , 1999 .

[2]  Anirban Dhar,et al.  Characterization of porous core layer for controlling rare earth incorporation in optical fiber. , 2006, Optics express.

[3]  Takashi Handa,et al.  Aluminum or phosphorus co‐doping effects on the fluorescence and structural properties of neodymium‐doped silica glass , 1986 .

[4]  M. Pal,et al.  Investigation of the optical gain and noise figure for multi-channel amplification in EDFA under optimized pump condition , 2007 .

[5]  J. Townsend.  The development of optical fibres doped with rare-earth ions , 1990 .

[6]  Won-Taek Han,et al.  Effect of Soaking Temperature on Erbium Doping of Optical Fiber Core in MVCD Solution Doping Process , 2003 .

[7]  D. Payne,et al.  Fabrication of low-loss optical fibres containing rare-earth ions , 1985 .

[8]  H. Chung,et al.  Aluminum chloride [alias its reaction product(s) with ethanol] for the stabilization of poly (vinyl chloride)? , 1997 .

[9]  Vlastimil Matêjec,et al.  Preparation of optical cores of silica optical fibers by the sol-gel method , 1997 .

[10]  E. M. Dianov,et al.  Doping of optical fiber preforms via porous silica layer infiltration with salt solutions , 2005 .

[11]  David N. Payne,et al.  Solution-doping technique for fabrication of rare-earth-doped optical fibres , 1987 .

[12]  B. Ainslie.  A review of the fabrication and properties of erbium-doped fibers for optical amplifiers , 1991 .