Optical access system and method supporting optical interconnection between WDM-PON subnets

Abstract

The invention discloses an optical access system and method supporting optical interconnection between WDM-PON subnets. Far-end node structure and colorless optical network unit design in a WDM-PON are important research content in an optical access network. The embodiment of the invention provides an optical access system and a communication method for supporting optical interconnection between WDM-PON subnets. According to the scheme, the following three functions are realized by using lower device cost: 1, a conventional uplink and downlink communication function between an OLT and an ONU of a WDM-PON; 2, each ONU is divided into two subnets, and the subnets are physically isolated through wavelengths; and 3, the function of mutual communication between subnets is supported. According to the invention, the receivers or transmitters of the two subnets can be all colorless or colorless in the subnets, but the subnets are different, and particularly, the tunable laser part can be colored along with the subnets. The design not only considers the increased manpower maintenance cost of the colored ONU in the operation and maintenance process, but also considers the increased technicaldifficulty and cost brought by the tunable laser in a large wavelength range, and meanwhile, the function of mutual communication between sub-networks is added.

Description

technical field [0001] The invention relates to optical communication and optical network technology, in particular to wavelength division multiplexing passive optical network technology. Background technique [0002] Time Division Multiplexing-Passive Optical Network (TDM-PON) and Wavelength Division Multiplexing-Passive Optical Network (WDM-PON) are two types of optical access important technology. During the evolution of the optical access network rate from 10Gbit / s to 40Gbit / s, to 100Gbit / s, Time-Wavelength Division Multiplexing-Passive Optical Network (TWDM-PON) ) is considered to be an effective solution with both performance and economy. However, with the increase in the number of users and the increase in the access rate of a single user, WDM-PON technology has attracted the attention of the industry and is considered to be the most important technical solution in the next-generation optical access network. [0003] The wavelength division multiplexing (Wavelength...

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Problems solved by technology

3. ODN uses a wavelength selective switch to connect different users. Each port of the wavelength selective switch can independently select any wavelength, but the loss of the device is large, and it cannot be completely passive; the application of this scheme in actual WDM-PON Currently only in the exploratory stage

The second type of WDM-PON completely changes the ODN of the original TDM-PON, and needs to be redeployed in the actual process; the third type of WDM-PON is the most flexible, but the loss of the wavelength selective switch is large and the cost is high

At the same time, in the existing WDM-PON, there is no direct communication between end users, and the direct communication between end users is very important for some applications that require low latency in the future, although in TDM-PON There are some schemes for direct communication between ONUs, but there are not many such schemes in WDM-PON for colorless ONU requirements

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