本建议提供了实现光学安全的技术指南和要求 用于人眼和光学系统的同步传输（SDH）和光学设备。光学安全等级的实际定义和规范不在本建议的范围内（由IEC提供）。主要应用领域是为采用拉曼放大的光传输网络设计的系统和具有大信道数的密集波分复用（DWDM）系统。 为了便于操作这些系统，本建议侧重于自动重启的自动降功率（APR）技术。

This Recommendation provides guidelines and requirements for techniques to enable optically safe working conditions (for the human eye and skin) on optical interfaces of the optical transport network, including conventional synchronous digital hierarchy (SDH) systems, for equipment in both restricted and controlled locations.The actual definition and specification of optically safe levels are considered outside the scope of this Recommendation (they are provided by IEC).The main fields of application are systems designed for the optical transport network employing Raman amplification and dense wavelength division multiplexing (DWDM) systems with large channel counts. For the purpose of ease of operating these systems, this Recommendation focuses on automatic power reduction (APR) techniques with automatic restart.