Dissertation
Dissertation > Mathematical sciences and chemical > Physics > Optics > Nonlinear optical ( light and matter) > Stimulated Brillouin scattering

Study on Stimulated-scattering-induced Slow Light in a Single Mode Optical Fiber

Author WangShiHe
Tutor RenLiYong
School Xi'an Optics and Fine Mechanics
Course Optical Engineering
Keywords Diffuse light Stimulated Brillouin Scattering (SBS) Flat top broadband gain spectrum Zero Span Large signal gain
CLC O437.2
Type Master's thesis
Year 2008
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A single-mode optical fiber technology in its low power threshold value, the wavelength-tunable, easy control of the group velocity and the compatibility with the existing optical communication system based on the stimulated scattering especially those subject to the slow-down in the group velocity of the stimulated Brillouin scattering (stimulated Brillouinscattering: SBS) and good controllable optical delay optical buffer, with potential applications in optical data precision synchronization and other fields, has become a slow light research hotspot. Only tens of MHz due to the the SBS intrinsic bandwidth in order to transmit a higher bandwidth signal pulse, have been proposed a lot of building broadband SBS gain spectrum of the method, and a method of increasing the optical power of the pump signal caused by compensation gain spectrum broadening optical delay weakened. These broadband gain spectrum that can obtain a sufficient SBS gain bandwidth and still give a great deal of distortion of the signal light, but in the process of the role of the long distance and slow light. On the basis of previous work, the steady-state small-signal approximation, build the flat top can greatly reduce signal distortion broadband gain spectrum, using a similar method to find the SBS signal broadening due to the process of slow light zero The gain spectrum. Finally, we also discussed the large signal gain (considering pumping consumption that gain saturation) broadband pump case scenario, provided theoretical guidance for the application of slow light in actual communication. This innovation results mainly: 1 using the method of the gain spectrum and attenuation spectrum offset exactly by setting two different beam intensity broadband pump light frequency interval between the Brillouin frequency shift of 2 times, so that strong the gain spectrum of the pumping light (corresponding to the Stokes scattering) by the weak attenuation spectrum of the pumping light (corresponding to the anti-Stokes scattering) partially offset, to thereby construct a flattened broadband gain spectrum. And theoretically proved that this gain spectrum can greatly reduce the distortion of the signal pulse. 2 by using the same method as in the SBS gain spectrum due to the process of the slow-light pulse light broadening zero, further raising the possibility of the transmission rate of the optical signal in the single-mode optical fiber is theoretically predicted. Slow light transmission in the ultra-high-speed (high-bit-rate, narrow pulse, high-capacity) communication system will provide some of the theoretical and technical guidance. Studied the SBS due to slow light phenomenon in the case of large-signal gain, and is given a specific theoretical analysis. We can see that, in the case of large-signal gain, weakened by stimulated Brillouin effect.

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