Research And Design Of Optical Module Based On Electrical Dispersion Compensation

With the advent of 5G era,network data and traffic are bound to grow rapidly.Optical communication networks urgently need to be accelerated and upgraded.How to achieve higher transmission rates and longer transmission distances has become the mainstream direction of current research.This thesis studies the principles of attenuation and dispersion in optical fiber communication systems,and studies dispersion compensation techniques,and analyzes various optical dispersion compensation methods and electrical dispersion compensation techniques.Among the optical dispersion compensation technologies,dispersion compensation fiber is the most widely used,but has obvious shortcomings.Although there are many emerging optical domain compensation technologies,most of them are not mature enough.In contrast,electrical dispersion compensation technology has low cost and easy integration,dynamic dispersion compensation,small engineering volume,easy modification and other advantages.Coherent optical communication technology is usually inseparable from the electric dispersion compensation technology,which is also studied and researched in this thesis.The performance of the coherent optical module is much stronger than that of the current ordinary optical module,and it has a wide range of application prospects,but the high cost makes it impossible for large-scale commercial use at this stage.This thesis also studies a newly proposed quasi-coherent receiving technology,which has a simpler structure and lower cost than coherent detection technology.Although the benefits obtained are not as good as coherent detection technology,the improvement is very obvious compared with the existing direct detection technology.In order to explore the actual effects of quasi-coherent technology,this thesis combines existing optical modules and quasi-coherent receivers for experiments.The experiments show that quasi-coherent receivers have strong processing capabilities for optical signals degraded by chromatic dispersion.The use of quasi-coherent receivers can significantly improve the transmission sensitivity of optical modules and greatly extend the transmission distance of ordinary C-band 25Gbit/s optical modules.It is also found that quasi-coherent technology still has great potential,and the transmission distance of the module can be further increased if combined with electrical dispersion compensation technology.Finally,this thesis designs an optical module that combines electrical dispersion compensation technology and quasi-coherent technology.Through three parts: transmitter design,receiver design and overall design,the design idea of the optical module is described,and the idea of point-to-point communication system based on this optical module is proposed.