Design And Implementation Based On Full-duplex OFDM-PON System

In the next generation optical communication access network,integration of three networks based on telecommunication network broadcast network internet,new high-speed broadband business,such as the video games,mobile multimedia,high-definition TV and web conferencing,efficient connection between the optical wireless communication and passive optical network.TDM-based PON needs framing technology and complex scheduling algorithms to provide variety of services.WDM-based PON assigns optical filter distribution wavelengths to the corresponding receivers or different high-speed data to the appoint wavelength enabled by AWG.And,OFDM-PON optical access network,with the advantages of large capacity,many business characteristics,dynamic bandwidth allocation in both frequency and time domain and long distance transmission,can meet exponential increase user demand for access bandwidth.Besides,OOFDM has the inherent advantages:1)High IFFT/FFT' size,on the one hand,provides an enough separation of OFDM symbol and RF pilot used for laser phase noise compensation,on the other hand,keeps the overhead for cyclic prefix at the minimum value.2)High level QAM or PSK can overcome the cost of the electrical and optical components,further improve the data transmission capacity,easily improve spectral efficiency,largely relax electronic components bandwidth requirement at the transceiver.3)Synchronization technology,CO-OFDM has three major synchronization schemes:carrier frequency synchronization,sampling frequency synchronization and symbol timing synchronization.This paper has proposed a novel OFDM-PON framework enabled by OFDM been widely used in wireless communication and full-duplex PON architecture.With the help of OptiSystem7.0 and MatlabR2014a,simulation results show that BER required by communication are successfully achieved.Besides,both experimental data and simulation results are published on the famous optoelectronics journal.The main innovation points are as follows.1.A 40-Gb/s optical access system with hybrid 64/16/4-QAM-OFDM downstream link for SE improvement and lower complexity enabling by advanced DSP technology has been simulation demonstrated.As we know,this is the first simulation investigation using hybrid 64/16/4-QAM OFDM signal for downlink and NRZ for uplink transmission based on PON system.We find that high-level QAM is more sensitive to the ROP in this full-duplex PON system.2.We successfully analyzed a full-duplex PON access technique for both high SE and flexible dynamic bandwidth allocation in in-phase/quadrature-phase modulation coherent detection OF-DM(IQ-CO-OFDM)system,which consists of two 40-Gb/s links signal transmitted over 20-Km optical fiber path of SMF-28.One is hybrid 64/16/4QAM OFDM signal used for the downlink transmission and another is hybrid 16/8/QPSK OFDM signal available for the uplink transmission.For the sake of cost effective and reduce complexity,an ECL at 193.2-THz has been successfully for both downlink to provide an optical carrier signal with the ONU and uplink to perfectly generate LO signal.It is necessary for us to study how to realize subcarrier allocation in IFFT/FFT based on passive optical access system.3.A 40Gbps three sub-channels OFDMA downlink architecture enabled by MQAM technology is experimentally proposed and simulated investigation over 20-km short research standard single mode fiber(SSMF)transmission in intensity modulation direct detection(IMDD)PON access system,in which,each sub-channel has been made up of 256 successively possible subcarriers and three sub-channels are absolutely conveyed by three identical 4QAM,16QAM,64QAM data stream.This project has been successfully employed both channel estimation(CE)and carrier phase estimation(CPE)at the receiver side to improve system performance.The best sub-channel receiving performance of 4QAM OFDMA PON is second sub-channel,16QAM is first sub-channel,64QAM is second sub-channel.In addition,the receiver sensitivity has been obviously enhanced by-0.6,0.6,4.6-dBm comparing with single port 4QAM,16QAM,64QAM OFDMA broadband optical access network.