Novel wide-area coverage hybrid wavelength-time division multiplexing passive optical network system

Abstract

The invention relates to a novel wide-area coverage hybrid wavelength-time division multiplexing passive optical network system. A two-fiber bidirectional transmission mode is adopted for a system link. A central office wavelength division multiplexer / demultiplexer combines and splits uplink and downlink optical wavelengths respectively, so that the wavelength crosstalk of bidirectional data communication is avoided; a reconfigurable optical add-drop multiplexer inserted into a trunk fiber downloads and uploads signals of a time division multiplexing-passive optical network (TDM-PON) branch with any wavelength according to networking requirements; an all-optical wavelength converter transparently transmits a downlink optical signal which is downloaded by the reconfigurable optical add-drop multiplexer, and converts uplink data wavelength lambdaup signals which are transmitted by each optical network unit (ONU) in a unified way into uplink optical signals with optical wavelengths which are the same as the downlink optical wavelength lambdan of the branch; and an optical power splitter is connected with a plurality of ONUs in a hooking way to realize the service access of a user. The system is high in capacity, long in access distance, wide in coverage area, low in operation and maintenance cost and simple in network structure, a conflict between the bandwidth and cost of an access network is completely eliminated, and the advantages of various conventional PON technologies are reserved.

Description

technical field [0001] The invention relates to the technical field of optical access networks, in particular to a novel wide-area coverage hybrid wavelength division time division multiplexing passive optical network system. In particular, it refers to a new wide-area coverage hybrid wavelength division time division multiplexing passive optical network system based on reconfigurable optical add-drop multiplexers and all-optical wavelength converters. Background technique [0002] Against the background of the general trend of triple play integration, the Passive Optical Network (PON) technology, which has the advantages of large capacity, full service, low cost, high reliability, and easy maintenance, has been adopted by major fixed network operators and equipment The manufacturer considers it the best solution for fiber-to-the-home (FTTH) access. At present, TDM-PON (EPON / GPON) and WDM-PON optical access networks have been successfully commercialized on a large scale aro...

AI Technical Summary

Problems solved by technology

[0003] Based on its good economy and practicability, TDM-PON technology has been widely used, but its backbone fiber bandwidth capacity is low, the access distance is short (20 kilometers), the coverage area is small, and the increase in the branch ratio leads to system QoS performance and Disadvantages such as reduced end-user bandwidth are also exposed

[0004] WDM-PON technology has high security, optimal bandwidth guarantee and QoS performance. It can easily realize network upgrade and expansion by increasing the working wavelength. However, its user terminal equipment requires specific wavelength configuration, which brings inconvenience to operation maintenance and interconnection. And the high cost of equipment limits its wider application

[0005] As a new technology derived from the smooth transition stage from TDM-PON to WDM-PON, although hybrid wavelength division time division multiplexing passive optical network has the advantages of both, its inherent point-to-multipoint tree network structure causes The problem of limited single-point access coverage and access blind spots within the transmission distance of the backbone optical fiber still exists

[0006] Therefore, the existing mainstream passive optical network technologies are not satisfactory.

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