This research center has been implementing construction and development of optical communication system, which will be the backbone of next generation communication industry. Our lab has focused on the super-dense WDM(Wavelength Division Multiplexing) optical transmission technology, which is regarded as the optimum technology that can meet the demand for high-capacity and superhigh communication services. Based on the research results, this center has been making efforts to construct a communication system that can be applied to the superhigh services from long-distance and high-capacity transport networks at the national level to user access networks. On the other hand, the center focuses on technology accumulation through steady mutual exchange of information between industry and academic field, including producing high-level core manpower.
TDM
WDM
DWDM
40 Gbps
UD-WDM
Our lab has developed the optical transmitter by using 256 LED light sources, and made a success in reducing the board size and heating value through using new temperature control chips and upgrading the existing circuits when designing a CPU board used for light source control. Based on the research results, the number of light sources per control PCB has been doubled. The light sources of 256 channels were arrayed by using the Beat-frequency-locking technology, in which the gap of 12.5 GHzb etween channels is regarded as very small. In order to carry out long-distance transmission, the lab has fabricated recirculating loop of 400 km/turn. And the lab has been carrying out 2000 km one-way transmission experiments by using the 256 super-dense WDM channels, the transmission line and recirculating loop.
