Method and apparatus of laser safety protection in optical communication system

Abstract

The invention discloses a laser safety protecting method and device in optical communication system, belonging to laser safety field. And the invention advances a method, making low frequency small amplitude modulation on each optical channel in optical fiber to make signal of each optical channel carry a low frequency mark signal, detecting any low frequency mark signal at lower node and able to determine the upper optical fiber link is normal and otherwise considering the upper optical fiber link fails, thus controlling optical power output of the node and achieving the laser safety purpose. And the invention also provides a safety protecting device in optical communication system for implementing laser safety protection.

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, i...

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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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