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Photonic Methods for Ultra-broadband RF Arbitrary Waveform Generation

Mokhtari, Arash | 2013

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 44560 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Akbari, Mahmood; Mehrany, Khashayar
  7. Abstract:
  8. This thesis includes five major parts and eight chapters. In the first part, the literature of arbitrary waveform generation is reviewed. The expansion and diversity of telecommunication services like WIMAX , UWB , RoF , satellite telemetry methods and sensor networks require ultra-broadband arbitrary waveform generation methods. The ultra-broadband signals are those signals with normalized bandwidth (%BW is the ratio of signal’s bandwidth to the central frequency) over 15%. The main approach to enjoy the advantages of photonic processing is to modulate microwave signal with the light and then feed it to the optical signal processor. This light processor in case of linearity is called microwave-photonic filter.The second part (chapters 2 to 4) of this thesis dedicates to the using of amplitude and phase ripples in FBG to make the microwave-photonic filter tunable. Conventional block diagrams using amplitude and phase modulators in the presence of phase and amplitude ripples are studied. Controlling the ripples of FBGs, the transfer function of filters can be tuned and engineered.In the third part (chapters 5 and 6), the slow light elements using stimulated Brillouin scattering (SBS) are optimized that can be employed as the basic building block of arbitrary waveform generators. The forth part (chapter 7) discusses the slow light element using time-frequency conversions; then, a microwave-photonic filter with FWHM of 2.55 GHz and FSR of 4.01 GHz is realized and experimented that has two basic properties namely FSR-tunability and transfer frequency translation.Finally, some future research projects are proposed and concluded
  9. Keywords:
  10. Microwave-Photonics Filter ; Ultrabroadband Waveforms ; Optical Methods ; Slow Light ; Time Frequency Transform ; Tunable Optical Delay Lines ; Simulated Brillouin Scattering (SBS) ; Fiber Bragg Grating (FBG)

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