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Continuous Wave Frequency Modulated Optical Feedback (CWFM-OF): Theory and Applications

Jha, Ajit

Abstract (englisch):

Paradoxically optical feedback (OF) (the phenomenon in which a fraction of the optical field emitted by a laser is fed back into its cavity), that was once considered an undesired phenomenon in the context of optical fibre communications because it introduces instabilities in the laser, has proven to be extremely useful in different real world photonic sensing applications. The optical feedback affects the internal parameters of the laser, such as the facet reflection coefficient, the laser gain, the photon and carrier density, and ultimately the emitted intensity from the laser. This direct relationship among the OF, intensity and frequency modulation is appealing because it transfigures the laser into a complete interferometric set-up where the laser itself acts as source, detector and interfering media all in one, suited for non-contact, non-destructive photonic sensing. The study in this Thesis contributes to different areas of optical feedback interferometry (OFI): from the theoretical formalization of understanding the transfer function of the laser under OF based on scattering theory, to signal processing of the optical feedback signal (OFS) in time and frequency domain simultaneously using the wavelet transform for combating noise, speckle management and extraction of the vibration related parameters of periodic and transient vibrations all in a single processing step. ... mehr

Volltext §
DOI: 10.5445/IR/1000068826
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mess- und Regelungstechnik mit Maschinenlaboratorium (MRT)
Publikationstyp Hochschulschrift
Publikationsjahr 2016
Sprache Englisch
Identifikator urn:nbn:de:swb:90-688260
KITopen-ID: 1000068826
Verlag Karlsruhe
Umfang XXIX, 201 S.
Art der Arbeit Dissertation
Fakultät Fakultät für Maschinenbau (MACH)
Institut Institut für Mess- und Regelungstechnik mit Maschinenlaboratorium (MRT)
Prüfungsdatum 25.11.2016
Bemerkung zur Veröffentlichung Zugl.: Barcelona, Techn. Univ. of Catalonia (UPC), Diss.
Schlagwörter Optical feedback, frequency modulation, acoustic wave
Referent/Betreuer Stiller, C.
Royo, S.
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