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1.前言适用于海底传输线路的光传输技术与目前的海底同轴传输方式相比,具有大幅度扩大中继间隔的可能性。由于最近长波长带的光传输技术取得进展,增加了实现海底光缆传输方式的可能性,目前,正在开展各方面的基础研究工作。曾报导过利用长波长带的光纤低损耗化,进行中继间隔约为63km(传输速率32Mb/s)的传输实验情况,这会使日本相当数量的海底传输线路实现无中继化和高可靠性。但
1. Introduction The optical transmission technology applicable to the transmission lines on the sea floor has the possibility of greatly expanding the relay interval compared with the current method of transmitting the sea-floor coaxial transmission. As the progress of optical transmission technology in the long wavelength band has recently been made and the possibility of realizing the transmission mode of optical fiber cables on the sea floor has been increased, at present, various basic research work is being carried out. It has been reported that a transmission experiment using a long-wavelength band for optical fiber loss reduction at a relay interval of about 63 km (transmission rate of 32 Mb / s) will result in a considerable number of submarine transmission lines in Japan being non-relayed and highly reliable Sex. but