Extensible low-overhead TWDM-PON all fiber protection structure

Abstract

The invention discloses an extensible low-overhead TWDM-PON all fiber protection structure. The structure comprises an optical line terminal OLT, the optical line terminal OLT is connected with M remote nodes RN through a fiber to form a main ring, any two remote nodes RN on the main ring are connected with an extension node EN, the extension nodes EN are connected with M remote nodes RN through the fiber to form a secondary ring, any remote node RN on the main ring and N optical network units form a last kilometer ring through the fiber, and the main ring, the secondary ring and the last kilometer ring are all protected through a method of ring protection. The extensible low-overhead TWDM-PON all fiber protection structure provided by the invention can effectively reduce protection overhead while improving reliability. Secondly, the structure provided by the invention also can extend flexibly between any two remote nodes RN of the main ring through the extension node EN, and when the fiber connecting the extension node EN is failed, the structure can provide protection through a method of redundant backup, thus, reliability is guaranteed effectively while network extension is carried out.

Description

technical field [0001] The invention belongs to the field of optical network technology, and relates to a next-generation time division wavelength division multiplexing passive optical network (Time and Wavelength Division Multiplexed Passive Optical Network, TWDM-PON) fault protection technology in the optical network, in particular to a scalable low Overhead high survivability PON protection structure. Background technique [0002] With the development of new technologies and applications such as 4K / 8K ultra-high-definition video, virtual reality, smart home, and the Internet of Things, network and high-bandwidth services impose strict requirements on the access network for large capacity and flexible expansion. Passive Optical Network (PON) is regarded as the ultimate solution of fiber-to-the-home. The ITU-T GPON standard series has developed from GPON and XG-PON1 to the second-generation passive optical network (next-generation passive opticalnetwork stage 2, NG-PON2), ...

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Problems solved by technology

In "A novel survivable architecture for hybridWDM / TDM passive optical networks" [Optics Communications[J].2014,312:52-56.], Qiu Y et al. proposed a communication between RN and ONU in TWDM-PON system The tree-ring structure of the last mile optical fiber for ring network protection, but the redundant backup method is still used for the trunk optical fiber, and it does not have the function of network expansion

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