TWDM-PON (time division multiplexing-passive optical network) structure and TWDM-PON equipment for annular subnet extension and control method

Abstract

At present, low-cost optical network units in TWDM-PON (time division multiplexing-passive optical network) and user amount expansion are key research issues in optical access networks. an embodiment of the invention provides a TWDM-PON optical access network structure for annular subnet extension and provides specific structures of certain devices in the network and a control method of the whole network and particularly provides a novel optical network unit structure supportive to subnet extension, an optical network unit side subnet structure and a structure of a subnet optical network unit. By adoption of the network structure and the equipment, users in subnets can share a tunable laser with the optical network units while receiving of downlink signals is unaffected; gains of uplink and downlink optical amplifiers can be tuned according to intensity of uplink and downlink optical signals, and accordingly quality of signals in the optical network units and optical network unit side subnets can be optimized; in addition, TWDM-PON user amount expansion can be carried out effectively while low terminal cost is kept.

Description

technical field [0001] The invention relates to optical communication and optical network technology, in particular to passive optical network technology with time division and wavelength division mixing. Background technique [0002] Time Division Multiplexing-Passive Optical Network (TDM-PON) and Wavelength Division Multiplexing-Passive Optical Network (WDM-PON) are two technologies in the field of optical access. an important technology. During the evolution of the optical access network rate from 10Gbit / s to 40Gbit / s, Time-Wavelength Division Multiplexing-Passive Optical Network (TWDM-PON) is considered to be a An effective solution with both performance and economy, it combines the wavelength-dimension resource expansion method of Wavelength Division Multiplexing (WDM) and the advantages of flexible bandwidth allocation of Time Division Multiplexing (TDM) technology to form a A new type of passive optical network. The typical structure of TWDM-PON is as follows figu...

AI Technical Summary

Problems solved by technology

If the existing structure is adopted, the splitting ratio of the optical splitter has been determined when the network is deployed, and it is difficult to use other methods to increase the number of network users.

Even if the optical splitter can be replaced, the optical power budget and device selection of the entire network are carried out according to the original optical splitter, so there is a risk of replacing the ONU in the entire network

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