Fiber Fabry-Perot interferometer (FFPI) sensor using vertical cavity surface emitting laser (VCSEL)

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dc.contributor.advisor Taylor , Henry F . en_US
dc.contributor.committeeMember Eknoyan , Ohannes en_US
dc.creator Lee , Kyung -Woo en_US 2006 -10 -30T23 :25 :36Z 2014 -02 -19T19 :26 :16Z 2006 -10 -30T23 :25 :36Z 2014 -02 -19T19 :26 :16Z 2005 -08 en_US 2006 -10 -30T23 :25 :36Z
dc.identifier.uri http : / /hdl .handle .net /1969 .1 /4221
dc.description.abstract This research represents the first effort to apply vertical cavity surface emitting lasers (VCSELs ) to the monitoring of interferometric fiber optic sensors . Modulation of the drive current causes thermal tuning of the laser light frequency . Reflection of this frequency -modulated light from a fiber Fabry -Perot interferometer (FFPI ) sensor produces fringe patterns which can be used to measure the optical path difference of the sensor . Spectral characteristics were measured for 850nm VCSELs to determine the combination of dc bias current , modulation current amplitude and modulation frequency for which single mode VCSEL operation and regular fringe patterns are achieved . The response characteristics of FFPI sensors were determined experimentally for square , triangular , saw -tooth waveforms at frequencies from 10kHz to 100kHz . The dependence of VCSEL frequency on the dc bias current was determined from spectral measurements to be ~165GHz /mA . An independent measurement of this quantity based on counting fringes from the FFPI sensor as the laser modulated was in good agreement with this value . The effect of optical feedback into the laser was also studied . By observing the fringe shift as the FFPI sensor was heated , a fractional change in optical length with temperature of 6 .95 X 10 -6 / ? ? ? ?C was determined in good agreement with previous measurements on a 1300nm single mode fiber . The performance of 850nm VCSEL /FFPI systems was compared with their counterparts using 1300nm distributed feedback (DFB ) lasers . The results of these experiments show that the 850nm VCSEL /FFPI combination gives regular fringe patterns at much lower bias current and modulating current amplitudes than their 1300nm DFB /FFPI counterparts . en_US
dc.format.extent 1293696 bytes
dc.format.medium electronic en_US
dc.format.mimetype application /pdf
dc.language.iso en _US en_US
dc.publisher Texas A &M University en_US
dc.subject fiber en_US
dc.title Fiber Fabry -Perot interferometer (FFPI ) sensor using vertical cavity surface emitting laser (VCSEL ) en_US
dc.type Book en
dc.type.genre Electronic Dissertation en_US
dc.type.material text en_US
dc.format.digitalOrigin born digital en_US


Fiber Fabry-Perot interferometer (FFPI) sensor using vertical cavity surface emitting laser (VCSEL). Available electronically from http : / /hdl .handle .net /1969 .1 /4221 .

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