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Statistical Analysis of Optical Clock Recovery System Based on Second Harmonic Generation (SHG) Detection Scheme in Optical Networks

Ziyadi, Morteza | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40935 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Salehi, Javad
  7. Abstract:
  8. In this thesis, we statistically model and analyze one of the main systems in optical communications which are based on Second HarmonicGeneration (SHG) process. To this end, we first introduce various applications of this process in optical communication systems and see that the main application of this nonlinear process is in the process of optical clock recovery in both of OTDM and SPE_OCDMA networks. In the rest of the thesis, we characterize the mathematical structure of these systems and use that to statistically analyze their behavior. In considering the optical clock recovery system based on SHG, we introduce three intrinsic sources of timing jitter in the system, namely, the On-Off nature of the incoming data pulses and the detector shot noise and the optical amplifier spontaneous emission noise, and we evaluate the variance of the timing jitter associated with the recovered clock which results from these three intrinsic sources. This, in fact, gives the performance limits expected from the underlying clock recovery scheme. We examine the variance of the introduced timing jitter as a function of different system parameters in both of the OTDM and SPE_OCDMA networks and come to the interesting result that the duty cycle factor near 4 in return to zero (RZ) optical pulses are optimal in the sense that it minimizes the variance of the system phase noise. In studying the clock recovery structures based on SHG, we consider the polarization dependence of these structures and based on that, we derive analytical expressions for cross correlation of signals in SHG in various polarization states and find the variance of timing jitter in polarization variations.
  9. Keywords:
  10. Phase Locked Loop (PLL) ; Optical Networks ; Timing Jitter ; Optical Amplifier ; Shot Noise Stochastic Process ; Spectrally Encoded-Code Division Multiple Access ; Optical Clock Recovery ; Second Harmonic Generation (SHG)

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