Research On The Key Technologies Of 40Gb/s Long-haul Transmission And All Optical Signal Process

As the scale of the Internet enlarged, as IPTV, HDTV and other new business developed, the network bandwidth demand is growing fast, which drives the development of optical communication market. Optical transmission and optical switching are the two main aspects of optical communications. In this paper, supported by the key projects of National Natural Science Foundation "Research on PMD compensation and related infrastructure technologies in high-speed optical communication systems" and "Study on all-optical circuit switching technology ", we conduct a deep investigation into the theoretical and experiment researches on the 40Gb/s long-haul transmission, novel technology to 40Gb/s All-optical clock extraction and wavelength routing network applications of chirped fiber Bragg grating. The main results achieved are as follows:With the effort of other teachers and students of our laboratory, A 500km 40Gb/s error-free transmission was implemented in NRZ-employed system where dispersion was compensated by chirped fiber Bragg gratings(CFBGs). In this transmission system, Only EDFA was used to compensated the fiber attenuation and without FEC. It was the longest distance reported on 40Gb/s NRZ transmission based on CFBGs. A novel CFBG quanlity evaluation method was proposed through the detail analysis on the impact of the CFBG non-ideal characteristic, such as the group delay ripple(GDR), reflectivity ripple(RR) and the bandwidth. This method could be quite helpful in grating fabrication and selection. The optimized span packages of hybrid compensation by both non-ideal CFBG and DCF was achieved on the basis the measured data of non-ideal CFBG in 40Gb/s long-distance transmission.Numerical model of all optical stimulated Brillouin scattering(SBS) clock extraction structure was established and optimized. Clock extraction from degraded NRZ signal was experimental realized. The tolerance of the input signal deterioration degree was analyzed. The clocks of dual-wavelength are extracted for the first time, to our best knowledge. Experiments were set up and clocks from 40Gb/s CSRZ 8km and 0km transmission signals were recovered. AWG was adopted to enhance the clock-to-carrier ratio(CCR) of both 40Gb/s non-ideal signal RZ and the chirped NRZ according to their spectrum.Specific functional modules of all optical system based on optical circuit switching were established and enhanced. The end-to-end distributed call and connection was realized. The distributed network management, the automatic discovery of network resources as well as the network survival were detail researched. Transmission performance of this system was analyzed and optimized. Some problems that may be probably faced in the case of network upgrading and evolution were discussed.