Generally, because the effects of environment on submarinefibercable and the terrestrial fiber cable are smaller, its PMD has smaller fluctuation and is easy to compensate.
架空光缆因受环境影响比较大，尤其受气温变化的影响较大，所以pmd波动也较大，对其补偿要困难一些。
2
A novel submarine optical fibercable monitoring system based on BOTDR and sonar is proposed, and the method of measurement is also discussed.
文章提出了一种新的基于BOTDR和声纳的海底光缆事件监测系统，并讨论了其测量方法。
3
The advanced instruments and equipment were used for the submarinefiber optic cable route surveys, and the collected digital information can be used to quickly and correctly make the maps.