Linearity analysis of microwave photonic links for analog signal processing

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dc.contributor.advisorBank, Seth Robert
dc.contributor.committeeMemberVishwanath, Sriram
dc.contributor.committeeMemberCampbell, Joe C
dc.contributor.committeeMemberWasserman, Daniel M
dc.contributor.committeeMemberNanzer, Jeffrey
dc.creatorMokhtari Koushyar, Farzad
dc.creator.orcid0000-0002-5451-7705
dc.date.accessioned2024-02-20T02:24:17Z
dc.date.available2024-02-20T02:24:17Z
dc.date.created2021-12
dc.date.issued2022-07-01
dc.date.submittedDecember 2021
dc.date.updated2024-02-20T02:24:18Z
dc.description.abstractMicrowave photonics (MWP) provides wideband, programmable, and low-loss platforms for analog signal processing with high power handling and immunity to electromagnetic interference. Recent advancements in integrated photonics have enabled a variety of on-chip functions for signal processing including true-time delays, tunable switches, high-Q resonators, frequency combs, and so on which make MWP a promising solution for ever-increasing demand of high throughput signal processing. However, achieving the desired dynamic range (DR) from MWP links has remained elusive for signal processing applications. The nonlinear sources of MWP links are studied with a focus on integrated MWP for signal processing. The concept of interference induced distortions (IIDs) are introduced which are generated by passive structures in the link. As demonstrated by the presented theory, simulations, and measurement results, IIDs from passive components can dominate the nonlinear distortions of active components in the link by tens of dB. The impact of parasitic interferometric structures which are formed by design, fabrication, and packaging imperfections on IIDs are discussed along with mitigation solutions. The impact of frequency chirp in active devices on IIDs are studied by simulation and measurement results which shows a magnified sensitivity of IIDs to parasitic interferences when chirp increases. On-chip tap combination, however, is a desired interference in many applications which its implementation remains challenging due to instabilities and limited DR originating from IIDs. Incoherent combiners are proposed in the literature based on multiple PDs or wavelengths at the cost of limiting bandwidth, increasing insertion loss, and necessitating a frequency comb. A tapered-pitch array combiner (TPAC) is introduced here to break the trade-offs in the incoherent and off-chip solutions. TPAC is designed based on the rules derived from the theory and simulation presented for modeling IIDs. A SFDR₃ equal to 107.3 dBc.Hz [superscript 2/3] is measured for the fabricated TPAC combing taps of a 6-tap filter using one wavelength and one PD. A modified TPAC is proposed for further IID suppression using optical phase alignment (OPA) of taps where up to than 26.9 dB IMD₃ suppression is measured. Finally, the stability and tunability of OPA approach are discussed followed by suggestions for future research.
dc.description.departmentElectrical and Computer Engineering
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/2152/123711
dc.identifier.urihttps://doi.org/10.26153/tsw/50505
dc.language.isoen
dc.subjectMicrowave photonics
dc.subjectSignal processing
dc.subjectDynamic range
dc.subjectIntegrated photonics
dc.subjectLinearity
dc.subjectInterference cancellation
dc.subjectWireless communication
dc.titleLinearity analysis of microwave photonic links for analog signal processing
dc.typeThesis
dc.type.materialtext
thesis.degree.departmentElectrical and Computer Engineering
thesis.degree.disciplineElectrical and Computer Engineering
thesis.degree.grantorThe University of Texas at Austin
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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