Research On All-optical Vetor Signal Processing Technology In Ultra-large Capacity And Flexible Optical Network

In recent years,under the continuous promotion of the "Broadband China" strategy,"Internet+" action plan and fifth-generation(5G)technology,services such as mobile Internet,cloud computing,Internet of Things,and video have developed rapidly.In order to adapt to the characteristics of large bandwidth and massive connections under the new network situation,the optical communication network puts forward new requirements for the larger capacity and better flexibility of the underlying carrier network,which brings great challenges to the signal processing technology both in the transmission and network switch nodes.At present,although the signal processing of optical communication networks is dominated by microelectronics technology,such method of relying on the scale effect to increase the processing speed of integrated circuits has gradually tended to the theoretical limit,and the limited electrical processing rate is difficult to adapt to the future development of ultra-large-capacity and flexible optical networks.All-optical signal processing technology can break the limitation of electronic rate bottlenecks,avoid redundant optical-to-electrical-to-optical(OEO)conversion.It is the key to the development of optical networks in the future by giving full play to the advantages of optical fiber communication networks.In this paper,according to the development needs towards ultra-large capacity and flexible optical communication networks,we propose alloptical regeneration method for high-order modulation format signals,various all-optical aggregation and de-aggregation methods,and the design of broadband and highly nonlinear resonator in the field of alloptical signal processing,the main academic research work and innovations are as follows:(1)Propose an all-optical simultaneous phase and amplitude regeneration method for high-order multi phase shift keying(MPSK)signals based on two-wave PSA.To address the problem of phasedependent amplitude noise conversion in the existing phase sensitive amplification(PSA)technology for MPSK signal regeneration,this paper proposes a new two-wave PSA regeneration method targeted at MPSK signal with amplifier spontaneous emission(ASE)noise,which can realize the simultaneous regeneration of both amplitude and phase.The simulation results show that,compared with the existing two-wave and three-wave PSA regeneration schemes,the regenerated signal from the proposed scheme has the best relay performance.(2)Propose an all-optcal de-aggregation method from 8-phase shift keying(8PSK)signal to quadrature phase shift keying(QPSK)signals without information loss.Aiming at the problem of information loss in the all-optical conversion from 8PSK signal to QPSK signal based on the principle of four-wave mixing(FWM),an all-optical deaggregation based on the fourth-order PSA without loss of infonnation is proposed.The simulation results show that the two de-aggregated QPSK signals retain all the information of the 8PSK signal.Benefiting from the phase compression effect of PSA,at the same bit error rate(BER),the received optical signal-to-noise ratio(OSNR)of the de-aggregated QPSK signal is improved by about 5dB compared with the 8PSK signal.(3)Propose two all-optical aggregation and de-aggregation methods.Aiming at the current situation that all-optical aggregation scheme and all-optical de-aggregation scheme are independent of each other and difficult to cooperate with the application,two simultaneous all-optical aggregation and all-optical de-aggregation methods are proposed:a)The all-optical aggregation and de-aggregation for QPSK signal and amplitude shift keying(ASK)signal.The simulation results show that the proposed method can not only realize the all-optical aggregation from a QPSK signal and an ASK signal to two kinds of 8-ray amplitude modulation(8QAM)signals but also the simultaneously reverse deaggregation;b)The all-optical aggregation and de-aggregation method for on-off Keying(OOK)signal and arbitrary MPSK signal.Taking the two cases of M=2 and M=4 as examples,the simulation results show that the proposed method can realize the optical aggregation from an OOK signal and a BPSK signal to a QPSK signal and simultaneously reverse de-aggregation,and the optical aggregation from an OOK signal and a QPSK signal to an 8PSK signal and simultaneously reverse de-aggregation.(4)Propose the design method of broadband and highly nonlinear micro resonator for its application in all-optical signal processing.Aiming at the problem that the narrow linewidth of the highly nonlinear micro resonator can not process the broadband signals,this paper proposes the design of broadband highly nonlinear micro resonator suitable for all-optical signal processing.Taking the nonlinear micro-ring resonator and the micro-bottle resonator as the research objects,the optimal conditions for the nonlinear efficiency of the micro resonator under the limitation of the fixed broadband condition are theoretically deduced,and the physical characteristics of the broadband highly nonlinear micro resonator are determined.A simulation platform for alloptical signal processing based on broadband nonlinear micro resonators is developed,and the high FWM efficiency of broadband highly nonlinear micro-ring resonator and micro-bottle resonator are verified on this platform,which provides theoretical guidance for the development of miniaturized optical functional devices.