Double-WDM-PON network architecture with mutual protection mechanism and method thereof

Abstract

The invention provides a double-WDM-PON network architecture with a mutual protection mechanism. The system is composed of two sub PONs, optical network units in the two sub PONs are grouped in a pairwise mode, and the optical network units are connected through an interconnection optical fiber. The invention further provides a corresponding protection method. Through the wide reflective spectrum characteristic of a chirped grating and the circulation routing characteristic of an AWG, optical fiber faults can be detected in time on one side of an optical line terminal, optical switches are switched so that protection switching can be achieved, and all feeder optical fibers and distributed optical fibers between the optical line terminal and the optical network units can be protected; a colorless optical network unit technology is adopted in each WDM-PON, and thus the cost of the optical network units can be effectively lowered; through a sharing optical fiber link, two WDM-PON systems can provide protection links for each other, hence, application of backup feeder optical fibers and backup distributed optical fibers is avoided, and the number of redundancy optical fibers is minimized.

Description

technical field [0001] The invention relates to a system in the technical field of optical communication, in particular to a dual WDM-PON network architecture and protection method with a mutual protection mechanism. Background technique [0002] With the rapid development of information technology and the rapid growth of new bandwidth services such as high-definition television, interactive games, and video conferencing, optical fiber access technology is developing in the direction of high bandwidth, large capacity, high reliability, and high service quality. Optical fiber-based passive optical networks have the advantages of large bandwidth and low cost. Fiber-to-the-premises, fiber-to-building and fiber-to-the-home have become an inevitable trend in the development of access networks. WDM-PON technology allocates a specific wavelength for each user, has the advantages of large bandwidth, protocol transparency, high confidentiality, and good service quality, and is consid...

AI Technical Summary

Problems solved by technology

Although this solution avoids the use of backup distributed optical fibers, the disadvantage is that backup feeder optical fibers are still required

However, the disadvantage of this solution is that the detection of fiber link failures and the switching of protection paths are all performed at the ONU end, which increases the complexity of the ONU.

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