Laser security protection method and apparatus in optical communication system

Abstract

The invention discloses a laser safety protection method and a laser safety protection device in an optical communication system, which belong to the field of laser safety. To solve danger problems existing on application occasions of a raman amplifier or a remote pump amplifier that whether a network breaks down and whether the network has laser leakage fail to be correctly judged through a mode of detecting optical power, the invention provides a method, which comprises the following steps: each path of optical channel signal bears a low-frequency identification signal through the low-frequency small-amplitude modulation to each path of optical channel in an optical fiber, and the normality of an upstream optical fiber link can be judged if any low-frequency identification signal is detected at a downstream node, or else the upstream optical fiber link is considered to be faulty further to control the output of optical power of the node to achieve the aim of laser safety. The invention also provides the laser safety protection device in the optical communication system, which is used for realizing the safety protection of laser.

Description

technical field [0001] The invention relates to the field of laser safety, in particular to a laser safety protection method and device in an optical communication system. Background technique [0002] Because of the good directivity of the laser, the intensity in the output direction is particularly high, so the threat to the human eye is particularly great. The lasers used in communication systems now have a wavelength distribution outside the visible light range, such as short-wave 870nm, long-wave 1310nm and 1550nm, and the human eye cannot directly see the beam distribution, so the threat to the human eye is particularly great. After the invention of EDFA (Erbium-Doped Fiber Amplifier-Erbium-doped Fiber Amplifier) ​​and WDM (Wavelength Division Multiplexing-Wavelength Division Multiplexing) technology, the optical signal power carried in the optical fiber is higher than that of the traditional SDH (Synchronous Digital Hierarchy-synchronous digital System) equipment, it...

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Problems solved by technology

[0006] In order to solve the problem that in the application of Raman amplifier or remote pump amplifier, it is impossible to correctly judge whether the network is faulty or whether there is a danger of laser leakage in the network by detecting the optical power. Each optical channel is modulated with low frequency and small amplitude, so that each optical channel signal carries a low-frequency identification signal. If any low-frequency identification signal is detected at the downstream node, it can be determined that the upstream optical fiber link is normal. Otherwise, the upstream optical fiber link is considered normal. Failure occurs, and then the optical power output of the node is controlled to achieve the purpose of laser safety. The method includes the following steps:

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