Then, it explains the application of WDM/DWDM on optical fiber transmission line.
接着，叙述波分多路在光纤传输线路的应用，对加大传输容量非常有效。
This digitalized optical fiber transmission system is upstream line of the bi-directional optical fiber transmission system.
数字化光纤传输系统，为有线制导光纤传输系统的一个部分；
The main development trend of high voltage transmission line's protection is the line fiber optical differential protection.
光纤电流差动保护是高压线路主保护的发展趋势。
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