Research Of Aggregation And De-aggregation Of Vector Optical Signal

With the arrival of the 5G era,the demand for information capacity from enterprises and users is growing rapidly.Massive information transmission and optical switching put forward the new requirement for the ability of optical fiber communication to have higher transmission capacity and faster processing capabilities.The optical signal in high-order modulation format can carry more bits of information in each symbol,which increases the transmission capacity and saves transmission bandwidth.However,the high-order modulation format signal has a small noise margin,and its transmitting and receiving devices are relatively complicated and costly,while the low-order modulation format signal has a strong anti-noise capability and the transmitting and receiving devices are relatively simple.Therefore,at the transmitting end,the receiving end,and the nodes between different optical networks in the optical communication system,the aggregation and de-aggregation techniques between the vector optical signals of high-order modulation format and low-order modulation format are particularly important.The proper aggregation or de-aggregation of the vector optical signals can not only simplify the transmitting and receiving devices,but also realize the reasonable distribution of information and complete the service grooming.At present,the research about aggregation and de-aggregation technologies of vector optical signals is mainly focused on the conversion between two low-speed services and one high-speed service.There are few studies on the aggregation and de-aggregation in more channels.This paper focuses on the research about aggregation and de-aggregation of vector optical signals in high-order modulation formats based on the nonlinear effects in highly nonlinear fibers.The main work and research of the paper are as follows:1.The aggregation and de-aggregation techniques between three BPSK optical signals and one 8PSK optical signal.The encoding information of the signals before aggregation and after de-aggregation is analyzed and compared one by one.And there is no information redundancy or loss in this system.Using the principles of coherent addition,cross-phase modulation,and four-wave mixing of vector optical signals,through the theoretical derivation of the formula,we have proposed the aggregation system from three BPSK signals into one 8PSK,and the de-aggregation system from 8PSK into the original three BPSK signals.What's more,we verified the feasibility of the systems by simulation,and analyzed the error vector magnitude,bit error rate,and constellation diagrams of input and output signals under different optical signal-to-noise ratios.2.The aggregation and de-aggregation techniques between four BPSK optical signals and one 16QAM optical signal.Based on the coherent addition of vector optical signals and non-linear effects,we have theoretically deduced the processes of aggregation and de-aggregation,proposed the simulation block diagrams of the aggregation system and de-aggregation system,and verified them by simulation.Furthermore,an all-optical aggregation method is proposed to aggregate six BPSK optical signals into one 64QAM optical signal.