Cooperative Research for Optical Communication System in Next Generation

近年来，光纤通信技术取得了显著的进展。全光通信系统已被提出，未来的通信系统将建设世界性的光纤网络。为了构建这样的网络，研究了实现超高速光通信的上限和波分复用的容量极限。对光网络系统的相关技术进行了研究。为此，我们的研究工作主要集中在以下三点。(1)超高速光通信系统：阐明了孤子传输系统的容量极限。研究了半导体激光器脉冲产生技术、频率/时间复用孤子传输技术和非线性光学信息系统。发现并分析了各种孤子传输系统，如成对孤子传输系统和三相孤子传输系统。对该传动系统的稳定性进行了详细的研究。(2)波分复用相干光通信系统：通过综合考虑激光技术和传输技术，设计波长复用系统，明确了传输系统的容量限制。(3)光网络技术：提出并分析了采用波分复用技术和光电流控制器件的光多功能网络。讨论下一代光通信系统的会议召开了。我们的研究工作报告发表了。

Recently, the optical fiber communication technique has made the remarkable progress. All optical communication system has been proposed and world-wide optical fiber net works will be constructed in the future communication system. For the purpose of constructing such networks, the upper limit of realizing the ultra-high speed optical communication and the limit of the capacity of the wavelength division-multiplexing were investigated. The techniques for the optical net work system were also investigated.For this purpose, our research works are focused on the following three points.(1) The ultra-fast optical communication systems :The limit of the capacity of the soliton transmission system was clarified. The pulse generation techniques using the semiconductor lasers, frequency/time multiplexing soliton transmission techniques, nonlinear optical information system were investigated. Various kinds of soliton transmission system, such as paired soliton and three phased soliton transmission systems are found and analyzed. The stability of such transmission system was investigated in detail.(2) The the wavelength-division-multiplexing coherent optical communicaiton systems :The limit of the capacity of the transmission system was clarified by designing the wavelength multiplexing systems taking the laser techniques and transmission techniques into consideration.(3) The optical network techniques :The optical multi-function networks using the wavelength-division-multiplexing techniques and the optical current conrolling devices were proposed and analyzed.The meeting for discussing the optical communication system in the next generation was held. The report of our research works was published.