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一、引言随着光纤、半导体激光器等性能的改善,光传输系统的实验研究也多起来了。除了无中继或1中继的实验外,数个中继的传输系统实验也有报告。对于这样的多中继长距离传输系统,不只是所谓3R中继器串联接续形成的中继线路,同时也进行了其中含有2R中继器、1R中继器的中继线路的研究。这些由不同类型的中继器构成的系统称为混合式传输系统,其意义除谋求达到降低功率消耗和小型化外,在2R,1R中继区间,在一定程度内具有自由选择比特速率的优点。就2R—3R混合传输系统而言,尽管其中混合配置了2R中继器和3R中继器,但在低比特率范围内,能够得到不亚于3R中继系统的中继间隔,得到的研
I. INTRODUCTION With the improvement of the performance of optical fiber and semiconductor laser, the experimental research of optical transmission system has also increased. In addition to experiments with no relay or 1 relay, several relay transmission system experiments have also been reported. For such a multi-relay long-distance transmission system, not only the so-called 3R repeaters are connected in series to form a trunk line, but also a repeater line containing 2R repeaters and 1R repeaters is studied. These systems composed of different types of repeaters are referred to as hybrid transmission systems. The meaning of the system is to provide a free choice of bit rate to a certain degree in the 2R and 1R relay zones in addition to the reduction of power consumption and miniaturization . In the case of the 2R-3R hybrid transmission system, although the 2R repeater and the 3R repeater are mixedly disposed therein, the repeater interval of no less than that of the 3R repeater system can be obtained in the low bit rate range.