Study On Key Technologies Based On Orthogonal Modulated Optical Label In Optical Label Networks

In recent years,with the rapid growth of voice business and fast development of IPbroadband network technology, the technology of dense wavelength division multiplexing(DWDM) in optical fiber communication system has been from10Gbps rate to l00Gbps rate.Due to the increase of transmission capacity and transmission instance in optical fibercommunication system, the chromatic dispersion(CD), polarization mode dispersion (PMD)and nonlinear effect generated by the signal transmitted in the optical link has also increasedas a consequence, which seriously affected the performance of optical fiber transmissionsystem. Therefore transitional forms of switching between Optical Circuit Switching andOptical Packet Switching have emerged,such as Optical Burst Switching and Optical LabelSwitching.These forms combine the advantages of both electronic and Photonic technologyand manage the optical switching by electrical control.In this paper,based on such a researchbackground, generation,swapping and transmission of optical labels are researched bytheoretical analysis,numerical simulation,and experimental verification,mainly including:Firstly, a novel orthogonal optical labeling scheme based on OFDM/PSK has beenproposed and simulation demonstrated. OFDM label signals are generated by intensitymodulation on the optical carrier, and PSK payload signals are generated by Phasemodulation.OFDM/PSK orthogonal modulation on the identical optical carrier is achievedand optical paeket is produced.After single-mode fiber transmission, Payloads and labels arereceived with the respective detection mode.OFDM signals can help to overcome thedispersion effect and PSK signals can suppress the non-linear effect effeetively because of theconstant intensity of PSK signals. Therefore, OFDM/PSK optical label the new scheme hasmuch attention.The feasibility of this scheme is proved by simulation and theoretiealanalysis.This scheme is characteristic of simple structure,high spectral effieiency and suitablefor long-distance transmission. The feasibility of this scheme is proved by simulation andtheoretieal analysis.This scheme is characteristic of simple structure,high spectral effieiencyand suitable for long-distance transmission.Secoundly, a novel orthogonal optical labeling scheme based on DPSK/PPM has beenproposed and simulation demonstrated, PPM technique is induced to solve the ER limitationof Payload in the DPSK/ASK labeled system. Compared with the DPSK/ASK labeled systemat the same rate,the ER of PPM Payload has been analyzed.Besides,the relationship betweenBER and received optical Power of DPSK label and PPM Payload after the transmissdifferent distances has also been investigated.The PPM Pulse width has Been studied for theinfluence on the system performance.The results show that DPSK/PPM labeled signal has apotential transmission Performance and the ER of Payload has been improved with the PPM format. The results show that DPSK/PPM labeled signal has a potential transmissionperformance and the ER of Payload has been improved with the PPM format.Finally, the concluding remarks of the study, and further research work made clear.