Research On Multi-source Signal Fusion And High Rate Optical Transmission Technology

Time division multiplexing is one of the main ways to implement high speed and large capacity communication systems.In the field of communications,electrical time division multiplexing and optical time division multiplexing have made great progress.Based on time-division multiplexing,this paper accomplishes one fusion of multi-source electrical signals through electrical time division multiplexing and completes the second multiplexing of signals through optical time-division multiplexing to achieve high-speed optical transmission of 80 Gbps.The main research content is as follows:From the basic theory of time division multiplexing,the thesis first studies the basic principle of time division multiplexing.Phase-locked loop based synchronization system theory is studied through control theory.The theory of frame state transition in time division multiplexing system is studied from the perspective of probability theory,and the relevant performance indicators of frame state transition are given in this paper.High-speed time-division multiplexing based on 8b/10 b SERDES is studied in the electrical time division multiplexing section.The serial to parallel and parallel to serial converse circuit and the channel coded polarity control theory are studied and designed.A high-speed clock generation circuit and a high-speed clock recovery circuit based on digital phase-locked loop are researched and designed.The basic principle of differential interface circuit and differential signal are studied in this paper,and the design of high speed differential transceiver/receiver circuit is completed.The optical time-division multiplexing section has conducted in-depth research on the following key technologies: Firstly,is the high speed narrow pulse light source technology,the theory of the mode-locked laser is studied,and the simulation analysis is carried out based on the mode-locking principle.The results show that the repetition frequency of the narrow pulse light source is up to 5GHZ,and the spectrum broadening is controllable and meets the requirement.The optical modulation technology module mainly studies the electro-optical outward-adjustment technology based on LiNbQ3 crystals.The correlation theory of optical coupler and optical fiber delay is mainly studied,and the results of simulation show that the optical pulse transfer is normal.System simulation analysis shows that electrical time division multiplexing Module works fine.After optical multiplexing,the width of the pulse signal is basically unchanged,all remain at 6.25 ps.In the 0.2ns optical time division period,the number of pulses is 16 and it meets the design requirements of 16-channel optical time division multiplexing in the system.The simulation analysis results of 80 G optical transmission show that for the NRZ code,the corresponding Q value is 7.2304 when the attenuation value is 23 db,and the corresponding Q value is 7.3609 when the attenuation value is 22 db for the RZ code.When the attenuation value is less than 23 db,system communication quality of NRZ pattern is good,and eye pattern has a high definition.When the attenuation value is higher than 23 db,the sharpness of eye pattern is obviously deteriorated,and the error rate is rapidly increased.The corresponding threshold of RZ pattern is 22 db.