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Loss analysis of single mode telecommunication fiber thermally-diffused core areas.

Ratuszek M.

Optica Applicata

2007

Vol. 37, nr 3

279-294

In this work, diffusion processes in thermally connected cylindrical fibers with weakly guiding and circular cross-section, that is, telecommunication fibers, have been presented. There have been discussed diffusion distributions of the core dopant of fibers spliced at T 2000 deg. C. Gaussian approximations of the core dopant concentration distribution and refractive index in the connecting area of single mode telecommunication fibers have been presented. Theoretical analysis of propagation and loss characteristics for thermally-diffused expanded core (TEC) of single mode telecommunication fibers has been performed, as well. Consistence of theoretical calculation results with experimental data, achieved on the basis of connecting telecommunication fibers with significantly different parameters, has been proved.

Scanning electron microscopy examination of telecommunication single mode fiber splices

Hejna J., Ratuszek M., Majewski J., Zakrzewski Z.

Optica Applicata

2003

Vol. 33, nr 4

583-589

Longitudinal sections of fused splices of different telecommunication single mode fibers were prepared and examined by scanning electron microscopy (SEM). Splices were examined for diffusion of dopant elements and for the presence of an intermediate zone. Observations in the material contrast mode obtained with backscattered electrons and X-ray microanalysis with the use of an energy dispersive spectrometer were made. Material contrast provides much better imaging of fiber cores than X-ray microanalysis and it was chosen for further studies. SEM micrographs show low amount of diffusion and good coupling of cores in splices under examination. No visible intermediate zone has been found in splices of the same fibers or fibers with similar cores. In splices of fibers with different core diameters and/or different dopant distribution the transition between cores is smooth with no visible widening of cores.