Research On Key Techniques In Multiple Wavelength3R Regeneration Based On Four Wave Mixing

With the continuous development of the information industry, the demand forextension of the optical communication network capacity grows gradually. At thesame time, the increasing demand of the transmission system rate of40Gbit/s andabove, and the signal need to carry out long-distance transmission, via a lot ofswitching nodes. Such a high-speed transmission system have more stringentrequirements to dispersion, signal deterioration caused by the nonlinear effect, thenoise of the amplifier, so it is necessary to solve the problem of the deterioration ofthe optical signal in the transmission process. As a result, high-speed3R(Reamplification, Reshaping, Retiming) regeneration system will become an essentialelement in the optical transmission network. Theoretically, nonlinear optical fiber andwaveguide can process multi-wavelength signals in parallel at the mean time. Thisthesis carries out theoretical and experimental studies focuses on the key issues thatneed to be addressed in all-optical3R regeneration system. We mainly carried out thefollowing works:Based on the establishment of theoretical models of the four-wave mixing light, thefiber gain and input and output characteristics of four-wave mixing effect in the idlerwavelength is analyzed and the theoretical simulation of nonlinear gain of the opticalfiber four-wave mixing effect characteristics is conducted. And the highly nonlinearoptical fiber input and output characteristic curve test is conducted to verify thepossibility of its all-optical judgment application.A multi-channel regeneration program based on four-wave mixing effect in DSF andexperimental testing is conducted. Compared with the prior use of four-wave mixingeffect for reproducing programs, using the degraded signal ad the pumping operationof the door switch for optical decision can suppress the noise on the signal "0"bit andthe "1" bit at the same time, which can solve the problem of reproducing uneven ofthe clock pumping program. We use bi-injection, orthogonal polarization of thetwo-way signal and of the delaying of half symbol period in timing to solve theproblem of channel crosstalk caused by the nonlinear effects of cross-phasemodulation (XPM) and cross-gain modulation (XGM) in nonlinear fiber. Besides, dual-signal crosstalk will not be generated by the clock signal, due to the setting ofbi-directional separator clock. Finally, the regeneration experiment test of4-channel40Gb/s deterioration signal in the wavelength of1547.72nm,1550.92nm,1557.36nm,1560.61nm is completed, and BER test is conducted. The receiver sensitivity ofthe multi-wavelength reproduction signal is improved by5.6dB to the most.