Distributed protection device and protection method for optical fiber link of wavelength division multiplexing passive optical network

Abstract

The invention relates to a wavelength division multiplexing passive optical network optical fiber link distributed protection device. An optical line terminal is connected with a remote node through a working feed-in optical fiber and a protection feed-in optical fiber. N de-multiplexing ports of the remote node are respectively connected with N working distributed optical fibers, and the N de-multiplexing ports are respectively connected with N protection distributed optical fibers. Each optical network unit comprises a monitoring and control unit, a first optical coupler, a downlink receiver, and a reflective semiconductor optical amplifier. Each monitoring and control unit comprises an optical power detector and an optical switch. The N working distributed optical fibers and the N protection distributed optical fibers are connected with the reflective semiconductor optical amplifiers and the downlink receivers through the monitoring and control units via the first optical couplers respectively. According to the invention, a colorless optical distribution network is realized, the use of an independent light source is avoided, the complexity and cost of equipment are reduced, and unlink and downlink services of other users are not affected during protection of switching protection.

Description

technical field [0001] The invention relates to a wavelength division multiplexing passive optical network optical fiber link distributed protection device and a protection method thereof, belonging to the technical field of optical fiber communication. Background technique [0002] In recent years, with the emergence of new multimedia services such as VoIP, IPTV, HDTV, conference TV, and video-on-demand, the existing bandwidth will not be able to meet service requirements. The optical access network technology, especially the passive optical network (Passive Optical Network, PON) technology has achieved rapid development due to its flexible access mode and high-capacity bandwidth characteristics. Wavelength Division Multiplexing (WDM) passive optical network (WDM-PON) adopts wavelength division multiplexing to realize virtual point-to-point connection between optical line terminal (OLT) and each optical distribution network (ONU). Optical distribution network (ONU) users c...

AI Technical Summary

Problems solved by technology

However, the shared fiber links between ONU pairs are in the same shared risk link group, because a fiber failure may cause all links in the group to fail

In addition, two adjacent ONUs are connected to each other through an optical fiber, and each ONU also receives the signal originally sent to the adjacent ONU, so the data security of WDM-PON is also partially sacrificed.

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