Research On The Wavelength Conversion Technology Based On Semiconductor Optical Amplifier (SOA)

Wavelength conversion technology could be widely used in optical fiber communication, it will play the key role especially in the all-optical network based on wavelength division multiplexing (WDM). Wavelength conversion can increase the utilization efficiency of wavelengths, efficiently solve the blocking problem in the networks, simplify the management of the networks, enhance the adaptability to failure of the networks. Wavelength converter based on semiconcuctor optical amplifiers (SOAs) has become a research hotspot in recent years due to its advantages of simple configuration and easy realization.In this dissertation, we focus on the wavelength conversion based on cross-gain modulation (XGM), cross-phae modulation (XPM) and four-wave mixing (FWM), several theoretical and experimental studies has been carried out as follows:1. The research signification of wavelength convertion is analyzed. Many kinds of wavelength converters and their development status are summarized.2. The theoretical basis of wavelength conversion based on SOAs is investigated. The static and dynamic model of SOA, which are used to simulate the wavelength conversion based on XGM, XPM and FWM, is established.3. An in-depth study on the gain characteristics of SOA is carried out. Several properties of wavelength conversion based on XGM in SOA, such as output extinction ratio (ER), conversion efficiency, output signal-to-noise ration (SNR), are studied theoretically and experimentally. The results provide detail gists for parameters optimization. 1.25Gb/s wavelength conversion based on XGM in SOA is achieved. 4. Numerical simulation of both in-phase and out-of-phase wavelength conversion based on XPM in SOA is carried out, the study focus on the output ER characteristic and the input power dynamic range. An effective new scheme to optimize the parameters is proposed.5. Numerical simulation of the wavelength conversion based on FWM in SOA is carried out, and the effects of the satellite light are considered. An in-depth study on the conversion efficiency and the output ER characteristic is carried out. More impersonal evaluations and conclusions are obtained.6. A new scheme of wavelength conversion based on the cascade of XGM and XPM in SOAs is proposed for the first time. The new scheme has many advantages, such as both high ER and large input power dynamic range, broad conversion band and can realize no-conversion operation, which are proved by the simulation results.The innovations of this dissertation are as follows:1. A new scheme of wavelength conversion based on the cascade of XGM and XPM in SOAs is proposed for the first time. The new scheme has many advantages, such as both high ER and large input power dynamic range, broad conversion band and can realize no-conversion operation.2. A new theory and scheme in which the iuput powers of the two probe beam are not the same is proposed. Based the scheme, the parameters optimization is achieved and results in larger ER and larger input power dynamic range.3. The output ER characteristic of the wavelength coversion based on XGM in SOA is analysed throuth the in-out characteristic curve. This method can open out the degeneration of ER and its causation more intuitively than other methods.