Title page for ETD etd-01102003-020757


Type of Document Master's Thesis
Author Kang, Yuhong
URN etd-01102003-020757
Title Calculations and Measurements of Raman Gain Coefficients of Different Fiber Types
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Stolen, Roger Hall Committee Chair
Jacobs, Ira Committee Member
Safaai-Jazi, Ahmad Committee Member
Keywords
  • effective Raman gain and Raman gain coefficient
  • stimulated Raman scattering
  • GeO2 concentration
  • Fiber Raman amplifier
Date of Defense 2002-12-09
Availability unrestricted
Abstract
Fiber Raman amplification using the transmission line is a promising technology to increase the repeater distance as well as the capacity of the communication systems. Because of the growing importance of fiber Raman amplification, it is desired to predict the magnitude and shape of the Raman gain spectrum from the doping level and refractive index profiles of different fiber designs.

This thesis develops a method to predict the Raman gain coefficients and spectra for a pure silica core fiber and two different types of GeO2-doped silica fibers given their index profiles. An essential feature of the model is the inclusion of the variation in Raman gain coefficient over the mode field due to the variation in the Ge concentration across the fiber core. The calculated Raman gain coefficients were compared with measurements of the peak Raman gain on a step-index GeO2-doped fiber and with published measurements from various sources. Agreement between the calculated and measured peak gain for the step-index fiber was excellent. There was qualitative agreement with published measurements but there were significant differences between the calculated and published gain coefficients, which are not understood.

Part of the work sought a way of predicting Raman gain coefficients from a standard gain curve given only the fiber type and the effective area. This approach appears promising for moderately-doped fibers with the proper choice of effective area.

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