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在海底区间不用中继器的横跨海峡的传输线路和弧岛线路等较短距离的海底传输线路的无中继海底光缆传输系统已经实用化了。本系统是由相当于1～5次群高速数字的1.5Mb/s、6.3Mb/s、32Mb/s、100Mb/s和400Mb/s传输系统组成的。本文详细地叙述了上述系统的构成方法和实现该系统的个几关键问题[(1)如何通过提高光接收机的光接收灵敏度来提高中继增益;(2)考虑模式分配嗓声的使用波长范围,LD的光谱半功率点宽度和光纤波长色散标准的设定方法;(3)利用主信号的码形变换规则的监视、勤务信号的插入和分路方法),以及在伊豆半岛.稻取——河津之间的现场试验的结果。
A repeaterless submarine cable transmission system having a shorter distance of a submarine transmission line such as a trans-Strait transmission line and an arc island line without a repeater in the seabed area has been put into practical use. The system is composed of 1.5Mb / s, 6.3Mb / s, 32Mb / s, 100Mb / s and 400Mb / s transmission system equivalent to 1 ~ 5 times high-speed digital group. This paper describes in detail the composition of the system and the realization of the system a few key issues [(1) how to improve the optical receiver sensitivity by increasing the optical receiver to improve the relay gain; (2) consider the mode of use of the voice wavelength distribution Range, LD spectral half-power point width and fiber wavelength dispersion standard setting method; (3) the use of the main signal of the code-shape transformation rules monitoring, service signal insertion and shunt method), and in Izu Peninsula. - Kawazu site test results.