Wavelength division multiplexing passive optical network optical line terminal having shared protection function

Abstract

The invention discloses a wavelength division multiplexing passive optical network optical line terminal having a shared protection function. The outside of the optical line terminal is provided with two ports, namely a primary port and a backup port; the inside of the optical line terminal comprises a primary optical transceiver module, a backup optical transceiver module and a control module as well as a 2*2 optical path switching module for optical path selection and switching; wherein the control module is connected to the primary optical transceiver module and the backup optical transceiver module, the number of the optical transceiver units of the backup optical transceiver module is not more than that of the optical transceiver unit needed to be protected by the primary optical transceiver module, at least light sources of part of optical transceiver units are wavelength-adjustable light sources; the primary optical transceiver module and the backup optical transceiver module are respectively connected with the primary port and the backup port through the 2*2 optical path, and the control module is also connected to a control end of the 2*2 optical path connected with the backup port; the control module is connected with the primary optical transceiver module and the backup optical transceiver module; and a light source of at least part of optical transceiver units of the backup optical transceiver module adopts a wavelength dimmablelight source. The optical line terminal provided by the invention can realize the protection to all wavelength optical transceivers in the wavelength division multiplexing passive optical network optical line terminal at the low cost of a redundant device, can realize the fault protection switching to a feeder line fiber and the local recovery to local faults of a distribution fiber, and even canrealize the recovery of a plurality of concurrent faults in a network when used in the network having double-fiber backups.

Description

Technical field [0001] The invention relates to a passive optical network, in particular to an optical line terminal of a wavelength division multiplexing passive optical network. Background technique [0002] Optical fiber access technology is one of the main technologies to realize the next-generation broadband access network. It has the characteristics of high bandwidth, large capacity, high reliability, and good service quality. It is convenient to realize the integration of multiple networks such as voice, data, and video. With the increase in the types of services and bandwidth carried by the access network, especially the incorporation of possible voice services, the requirements for its reliability are getting higher and higher. The specific manifestation is the increase in the requirements for network survivability, namely The network is required to have redundant protection and rapid recovery capabilities in the event of a failure, and it should be able to maintain comm...

AI Technical Summary

Problems solved by technology

[0005] At present, the protection of OLT in TDM-PON can be realized by double optical transceiver modules or double OLT, because there is only one pair of optical transceiver modules in OLT, so even if double redundancy is used, the cost increase is still relatively large compared to the entire network. Not significant, but if the protection of OLT in WDM-PON also adopts double redundancy, the increased cost will become the main limitation of this solution, and its protection efficiency is also too low

At present, WDM-PON uses mutual backup of OLTs of different PONs to protect against fiber failures, provides switching functions in OLT or ONU to protect redundant optical fiber paths, and uses redundant light sources in OLTs For other fixed-wavelength light sources in the OLT, there are no solutions that can protect the optical transceivers in the OLT and protect against fiber failures.

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