Loading...

Statistical Modeling and Analysis of Novel Linear and Nonlinear Receivers for Ultrashort Light Pulse Detection

Ranjbar Zefreh, Mahdi | 2015

976 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47865 (46)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Salehi, Javad
  7. Abstract:
  8. Utilizing ultrashort light pulses in optical communication systems can enhance the data rate or throughput in multiple access telecommunication systems. One of the most important challenges in ultrashort light pulse communication systems is the detection of such pulses among various types of noise in the receiver with conventional band-limited photodetectors which is proved to degrade the detection performance considerably. To overcome the aforementioned obstacle, contriving nonlinear optical preprocessors prior to the photodetector at the receiver is suggested. This preprocessor can increase the discrimination between ultrashort light pulse with high peak power and the noise with average low power. Although the presence of the nonlinear preprocessor can enhance the system performance however, it eventuates the mathematical and statistical complexity for system performance modeling and characterization. In this thesis, an specified nonlinear preprocessor called power-cubic is considered and statistically investigated and two typical power-cubic preprocessed communication systems are analytically analyzed based on the obtained statistical model. Also the performance of the power-cubic based systems is compared with formerly analyzed power-quadratic based systems. Also spectrally phase encoded optical code devision multiple access system, as an important communication system utilizing ultrashort light pulses, with more advanced modulation techniques are analytically investigated and compared with systems using classical modulation scheme with and without nonlinear preprocessors
  9. Keywords:
  10. Ultrashort Light Pulses ; Bit Error Rate ; Monte Carlo Method ; Thermal Noise ; Nonlinear Receiver ; Optical Code Division Multiple Access (OCDMA) ; Multiple Access Interference ; Shot Noise Stochastic Process ; Amplified Spontaneous Emission (ASE)Noise ; Decision Variable

 Digital Object List

 Bookmark

No TOC