1,720,973 research outputs found
Photonic Techniques for Generation and Detection of Millimiter Waves and their Applications
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Measurement of beat length and perturbation length in long single-mode fibers by backscattered signal analysis
No full textThe beat length performed on various types of long single-mode fibers was experimentally evaluated. By measuring the differential group delay (DGD) of fibers under test, their perturbation lengths were easily calculated
Improving the accuracy of the wavelength-scanning technique for PMD measurements
No full textAn improvement of the wavelength-scanning polarization mode dispersion (PMD) measurement technique is presented. It consists in the evaluation of the level crossing density for three or more levels, instead of only one. Experimental results show that measurement uncertainty can be reduced more than 40
Statistical characterization of fiber random birefringence
No full textThe statistical properties of the random birefringence that affects long single-mode fibers are experimentally evaluated by means of a polarization-sensitive optical time-domain reflectometry. The measurements are in good agreement with theoretical predictions and show, for what we believe is the first time, that the components of the local birefringence vector are Gaussian random variables
Continuous-wave backreflection measurement of polarization mode dispersion
No full textExperimental results of continuous-wave polarization mode dispersion (PMD) measurements are presented. The proposed technique is based on the backscattered signal given by the Fresnel reflection at the fiber far-end. Experimental statistical distribution of the differential group delay of the round-trip is reported. It presents a Rayleigh distribution whose mean value is simply related to the fiber mean differential group delay. Finally, the statistical distribution of the round-trip dispersion vector is found experimentally and numerically. The proposed method can be easily used for one-end measurement of PMD in installed optical cable
Measurement of local beat length and differential group delay in installed single-mode fibers
No full textWe present beat length and polarization mode dispersion (PMD) measurements performed on installed fibers. Results regard three different kinds of fibers: standard step index, dispersion shifted and nonzero dispersion (NZD). After a historical comparison with standard differential group delay measurement collected four years ago on the same fibers, we perform a spatial-resolved measurement of the beat length by analyzing the state of polarization of the backscattered field. We compare PMD properties of different fibers and calculate the statistical distribution of the beat length. The differential group delay (DGD) and the beat length statistics depend strongly on fiber type and on fiber position along the link. The influence of the beat length on the DGD is also discussed
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