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Erbium-doped fiber splicing and splice loss estimation

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3 Author(s)
Zheng, W. ; Div. of Fiber Opt., Ericsson Bus. Networks AB, Sundbyberg, Sweden ; Hulten, O. ; Rylander, R.

Erbium-doped fibers, deployed in erbium-doped fiber amplifiers (EDFA), often have small mode diameters (about 4-6 μm). If these fibers were to be abruptly interfaced with larger mode field diameter (7.5-10.5 μm) dispersion-shifted or conventional fibers, unacceptably large transmission loss penalties would be incurred. However, since the diffusion speed of most erbium fiber designs is higher than other fibers, a special real-time control (RTC) splicing technique is developed based on an image processing and a synamic splice loss estimation procedure in order to assure optimum thermal diffusion of the fiber core dopants, thereby creating a tapered transition region between the mating fibers, resulting in fiber splices that have consistently low losses (<0.1 dB) and high strength (>200 kpsi)

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Lightwave Technology, Journal of  (Volume:12 ,  Issue: 3 )