Research On DWDM Network Performance Monitoring Based On Optical Label

DWDM system is evolving rapidly the optical network,higher spectral efficiency and bandwidth,more dynamic.With the ROADM and OXC servicing in the network,wavelength connection becomes more and more flexible and reconstitution becomes more complex.Highly reliable and low cost performance monitoring system is needed in the network.It’s an important guarantee for DWDM system running smoothly and steadily to realizing wavelength-channel monitoring.The optical label motoring technology could avoid using an optical spectrum analyzer and optical filters,and its low hardware complexity and easy to service to the network.In an optical network,the control plane could not judge that whether the ROD AM completed the wavelength connections in orders,the monitoring of wavelength connection is an urgent demand.Meanwhile,the monitoring of optical power,OSNR,data modulate parameter of every wave-channel is also needed necessities.Therefore,this article focuses on above monitoring demand,carries out research on optical label monitoring technology.The main research work and innovations are as follows.1.As for the generating,modulating and receiving of optical label,this article carries out researches on how to transmit and receive DPSK optical label.A digital create,code and modulate method is raised.It could create and modulate the optical label to service data signal in the digital field without using hardware.Hundred-MHz-order-PD and hundredMSa/s-order-ADC is used in optical label receiver.Simulation research the influence between optical labels and service signals,and we find out a Parameter settings to ensure the degradation of OSNR is lower than 0.5dB.A low-cost timing error tolerated asynchronous is proposed to reply the timing frequency offset between the optical transmitter and receiver.Build a 16GBaud PM-16QAM and PM-QPSK simulation platform,and the results show that the algorithm could correct the timing error around±100ppm has been verified.Build an off-line experiment platform to test the scheme,the results show that the digital transmitter and low cost receiver of optical label is useful and reliable.2.As for the monitoring demand of optical power and OSNR of every wave-channel,this article carry out a low cost digital monitoring scheme based on optical label.In this scheme,Fast-Fourier-Transform(FFT)and spectrum integration methods are used to monitor optical wavelength power,and it could calculate the Gain of every optical amplifier by the optical labels.A 4GBaud-16QAM and QPSK off-line experiment is used to verify the power monitoring,the results show that the error is less than 0.5dB;The Noise Factor of every EDFA in every wave-channel could be founded in instruction book,and we could count the accumulation of ASENoise in linking,then OSNR could be calculated.A simulation of 8channel,10-cross DWDM system is used to verify the OSNR monitoring.The results show that the monitoring error is less than 0.5dB.3.As for the demand of connective performances of wavelength channels,this article carry out a monitoring scheme,which could monitoring the linking route state,modulated format and rate of service signals,breaks,abnormal gains and attenuations.Monitoring label byte sequences in fixed structure are set in optical label transmitter,which involved parameters,identifiers of service signals.Optical label receiver could recover this byte sequences and collate the real path and preinstall path,then find out the routing error in networks.The receive spectrum of optical labels is used to monitoring the linking abnormal state.A 16GBaud PM-16QAM simulation system is founded to verify the scheme,the emulational results shows it could 100%find the abnormal linking,error routing,and realize the modulated parameters.