The Realization Of Adaptive Electronic Dispersion Compensator And Performance Analysis

As the speed of optical communication continue to increase, the dispersion phenomenon which is generated in the process of signal transmission. Therefore, in order to ensure the accuracy of signal transmission, it is necessary to compensate the dispersion of the transmission signal. As the adaptive electronic dispersion compensator has the advantage of real-time compensation, easy extension and low cost, the compensation has been grown widespread concern.In this paper, we first described the research status of compensation technique at home and abroad. Next, we compared and analyzed a variety of self-adaptive compensation system models, after compared we obtained the balanced effect of decision-feedback model was better. Then the structures of DFE in the feed forward and feedback filter were discussed, including transverse filter (TF) , transverse wave filter structure (TWF) and its two kinds of improvement structures. In order to get a larger bandwidth, we finally chose the latter one as a DFE in the feed forward and feedback equalizer implementation structures through the comparison and simulation. After that, we carried out a detail study of the implementation approach of the circuit and layout structures of DFE. And two parts simulation were carried out. The first part was time-domain simulation by using MATLAB; we theoretically verified the equalizer could complete its dispersion compensation in 40 GB/s system; the second part was S parameters simulation, we verified the power gain and the match of the input and output through this simulation. We can see that in high-speed transmission channel, the DFE can effectively compensate PMD.