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Nonlinear Effect Stimulated Brillouin Scattering (SBS) and SBS Slow Light Analysis

Malekzadeh Najafabadi, Jaber | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42705 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Akbari, Mahmood
  7. Abstract:
  8. Nowadays, ultra-high bandwidths and speed are essential for information processing and transmission. Also, we know optical systems have these properties. Therefore, we use optical systems to provide these essentials. We need optical devices to obtain all optical systems. Optical buffers and memories are examples of optical devices which realization of them is still an unsolved challenge. The slow light is suitable method to realize optical buffers. To realize slow light, different methods have been introduced. One of these methods is slowing down of the group velocity of light pulses in a medium which we use that in this thesis. To realize these, many different methods and material systems have been developed but due to its significant advantages the nonlinear effect of stimulated Brillouin scattering (SBS) is particularly promising. In this thesis the slow light effect on the basis of SBS is investigated. We first theoretically explain the nonlinear effect of SBS which its behaviors can be described by a system of two coupled differential equations for pump and Stokes electric fields. In this thesis, these two coupled differential equations are solved analytically and exact analytical solutions are compared by approximation solutions as well. We have simulated the SBS slow light with these exact analytical solutions. The main objective of the thesis is to find possibilities to overcome the natural limitations of SBS-based slow light systems. Hence, this work focuses primarily on three topics: 1. The enhancement of the Brillouin bandwidth, 2. The enhancement of the SBS-induced time delay and 3. The reduction of the SBS-induced pulse distortions. For these three topics different novel systems were designed and investigated. The basis of this design is the unique feature of SBS that its spectrum can be tailored by a modulation of the pump spectrum. The most important results are a bandwidth enhancement to a multiple of the natural Brillouin bandwidth up to the GHz rang. In doing so, it was shown that all disadvantages of traditional SBS-based slow light systems can be successfully overcome
  9. Keywords:
  10. Fiber Optics ; Group Velocity ; Time Delay ; Slow Light ; Simulated Brillouin Scattering (SBS)

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