Abstract
In this paper the results of a theoretical analysis and practical investigation of mode interference in single mode optical fibres are described. It is shown that inter-modal interference is a sensitive parameter depending on the quality of an index profile or geometrical parameters of optical fibre. The comparison of experimental and theoretical values of mode interference indicates that the measurement of interference could be used for testing how the real refractive index profile of investigated fibre corresponds with the refractive index profile assumed at the calculation (step-index profile).
Highlights
Monochromatickú elektromagnetickú vlnu šíriacu sa optickým vlnovodom je možné popísať lineárnou kombináciou istých „vlastných“ funkcií
The interference of the fibres was investigated at the vyšetrovali v usporiadaní uvedenom v práci [3]
Mation obtained during investigation of the interference of vaní interferencie vyšších modov higher modes is illustrated by prezentujeme v tejto práci
Summary
V článku sú popísané výsledky teroetickej analýzy a meraní interferencie modov v málomodových optických vláknach. If more than one mode propagates, the optical stage at the end of the fibre is a superposition of values with different phases. Taking into account the different phase constants of the modes, we can express the output of the quadratic detector located at the end of the fibre of length l as follows:. When the phase constants (propagation velocity) of interfering modes are different, the value will depend on the length dĺžky vlákna a od vlnovej dĺžky svetla, ktoré vláknom prechádza. When locating the spatial nosti od konca vyšetrovaného filter axisymmetrically, but further vlákna sa naruší ortogonalita from the end of the fiber under symetrických modov Obr. 1 Schéma usporiadania pre vyšetrovanie interferencie ric modes is disturbed (such confišetrovaní interferencie modov a) symetrického a asymetrického; b) dvoch symetrických modov guration is useful for studying the LP01 a LP02), ako to ilustrujú schémy uvedené na obr. 1
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