Adaptive control of feed-forward linearization for laser nonlinearity compensation system

摘要: Radio over Fiber technology (RoF) is a promising solution to the next generation wireless access network because of its ability transmit high capacity data and be cost effective. However, RoF systems are analog which sensitive noise distortions. The links need have good linearity in order avoid nonlinear primary limitation on performance optical transceiver nonlinearity laser source transmitter. nonlinearities generate intermodulation distortion products can severely degrade links. Hence, various linearization schemes proposed compensate source, such as feedback, predistortion, feed-forward. Among technique, feed-forward considered most effective due provide broadband reduction at frequencies, all distortions regardless characteristics. relatively scheme, where highly influenced by changing operating conditions. feedforward system needs incorporated with adaptive properties achieve optimization for more practical implementations. In this thesis, transmitter has been modeled commercial software OptiSystem 9.0. integrated control developed MATLAB through Visual Basic scripting. results cosimulations achieved significant reductions 20 dBm third-order frequencies from 5.1 5.8 GHz.