Research On Wavelength Conversion Based On The Nonlinearity Of Fiber

This thesis focuses the research on wavelength conversion based on the nonlinearity of dispersion-shifted fiber(DSF).First, the principles of all sorts of wavelength conversion were summarized, and their advantages and shortcomings were discussed. All-Optical Wavelength conversion(AOWC) is more applicable to future All-Optical Network. So our research focused on the AOWC based on the nonlinearity of DSF. Then the characteristics of Four-Wave Mixing(FWM) in DSF were analyzed theoretically. Intensity-dependent phase-matching factor for four wave mixing was derived. Through investigating the FWM power as function of channel power and channel space, it showed that the new phase-matching factor was more effective, the relationship of parametrical gain in FWM V. S. pump wavelength and pump power were discussed.Secondly, the spectrum broadening due to the cross phase modulation(XPM) in DSF was analyzed, and the principle and experimental setup of actively mode-locked Erbium-doped fiber laser was introduced. Then the wavelength conversion based on XPM was studied experimentally. The spectrum broadening of continuous-wave(CW) was observed, further converted pulse was obtained by using Bragg fiber grating(FBG) as a filter. The peak power of the converted pulse was -38.67dBm, with Signal Noise Ratio (SNR) 25.02dB and pulse-width 2ns.In the last chapter, wavelength conversion based on supercontinuum(SC) in DSF was studied experimentally. The SC spectrum with 80nm bandwidth was observed, further the converted pulse was obtained by using FBG as a filter. The peak power of the converted pulse was -37.27dBm, with Signal Noise Ratio (SNR) 24.83dB and pulse-width 3ns.