Research On Characteristics Of Optic Parametric Amplification In Fiber

The phenomenon of optical parametric amplification (OPA) of the nonlinear fiber optics is supposed to be a high efficiency and a promising technology in all-optic wavelength conversion (AOWC), because of its short response time and transparence to different modulation formats and bit rates. Nowadays, scientists in related area throughout the whole world focus on the method to implement all-optic 3R regeneration based on optical parametric amplification. Hence, it is necessary to do in-depth study on the various properties of OPA. The main research of this dissertation is on the topic of the optical parametric amplification system of OPA system with 10GHz-pump and the research works are listed as the following.In theory, the processes of one-pump and dual-pump optical parametric amplification are discussed, and the phase-match condition of one-pump OPA system is deduced in detail, which leads to the easy getting of the gain curve of the signal.The effects of various factors on properties of one-pump OPA system is experimentally demonstrated, including zero-dispersion wavelength of fiber, wavelength of pump, power of pump, by keeping two of these three factors constant, and adjusting the remaining one. Hence, the gain curves of signal are plotted. The elementary study of OPA with two pumps on two signals is done.Wavelength division multiplexer (WDM) and polarization maintenance fiber (PMF) are respectively utilized to implement the orthogonality of the states of polarization (SOP) of the two pumps to restrain four-wave mixing between them. In particular, the PMF makes it easy to let the SOPs of the pumps orthogonal, however the difference of their wavelengths must be one of some definite values. The expression including such difference is deduced and demonstrated experimentally. Let the wavelengths of the two pumps be longer than the zero-dispersion wavelength of fiber, and then adjust the polarization controller to make the signal to acting with only one of the two pumps. Thus, the feasibility of multi-3R regeneration is demonstrated elementarily.The drawback of this OPA system is that the noise can't be suppressed effectively. To solve this problem, we will do in the future study.