thesis

Method of measuring monochromatic light wavelength by using wavelengthsensitiveoptical components

Abstract

U ovoj doktorskoj disertaciji dat je predlog nove metode za merenje talasne dužine monohromatske svetlosti pomoću spektralno osetljivih optičkih komponenti. Princip rada predložene metode se zasniva na kombinovanju spektralnih osetljivosti fiber-optičke račve i dva različita fotodetektora. Izvršena je implementacija i karakterizacija senzorskog sistema za merenje talasne dužine monohromatske svetlosti. U eksperimentalnoj postavci korišćena je 2×2 fiber-optička račva, germanijumska (Ge) fotodioda i indijum-galijum-arsenid (InGaAs) fotodioda. Postignuta je linearnost sa faktorom korelacije R2=0.99942 i merna rezolucija od 17 pm u opsegu talasnih dužina svetlosti od 1575 do 1615 nm (L-opseg). U istom opsegu, dobijena je merna greška od približno ±0.2 nm i ponovljivost od ±0.16 nm. Ispitani su uticaji promena temperature, snage optičkog izvora i šuma na karakteristike senzorskog sistema.In this thesis, a new method for measurement of monohromatic light wavelength by using wavelength-dependent optical components is proposed. The principle of operation of the proposed method is based on combining spectral sensitivities of fiber-optic coupler and two different photodetectors. Sensor system for measurement of monochromatic light wavelength is implemented and characterized. Experimental setup consists of 2×2 fiberoptic coupler, germanium (Ge) photodiode and indium-gallium-arsenide (InGaAs) photodiode. Excellent linearity (R2=0.99942) and measurement resolution of 17 pm are achieved in measurement range 1575-1615 nm (Lband). In the same measurement range, measurement error of approximately ±0.2 nm and repeatibility of ±0.16 nm are obtained. The influence of temperature, optical source power and noise on sensor system characteristics is investigated

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