Wavelength-division-multiplexing-based ethernet passive optical network transmission system and method

Abstract

The invention provides a wavelength-division-multiplexing-based ethernet passive optical network transmission system that is arranged on a circuit between a local-side optical line terminal and a client optical network unit and is used for transmitting a signal on a fiber. The system is composed of a first WDM-PON device, a first combiner/separator, a second combiner/separator, and a second WDM-PON device. To be specific, the first WDM-PON device is used for carrying out wavelength conversion on an optical signal; the first combiner/separator and the second combiner/separator are used for carrying out wave combination and wave separation on the signal; the second WDM-PON device is used for carrying out wavelength conversion on the optical signal. In addition, the invention also provides a wavelength-division-multiplexing-based ethernet passive optical network transmission method. According to the method, no modification on the original line and no laying of a new optical cable are required; and only a few of devices are added on the original line; and on the basis of wavelength conversion and wavelength division multiplexing of the ethernet passive optical network, transmission of a plurality of signals with different wavelengths is supported by one optical cable and thus the capacity of the user at the optical cable can be expanded by multiple times; and thus the heavy engineering load of reconstruction can be avoided under the circumstance that optical cable resources are insufficient.

Description

technical field [0001] The invention relates to the technical field of optical network transmission, in particular to an Ethernet passive optical network transmission device and transmission method based on wavelength division multiplexing. Background technique [0002] EPON (Ethernet Passive Optical Network) is a new type of optical fiber access network technology. It adopts point-to-multipoint structure and passive optical fiber transmission to provide various services on Ethernet. It adopts PON technology in the physical layer, uses Ethernet protocol in the link layer, and realizes the access of Ethernet by using the topological structure of PON. Therefore, it combines the advantages of PON technology and Ethernet technology: low cost; high bandwidth; strong scalability, flexible and fast service reorganization; compatibility with existing Ethernet; convenient management and so on. [0003] It is precisely because EPON has so many advantages that the number of users incr...

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Problems solved by technology

[0003] It is precisely because EPON has so many advantages that the number of users increases rapidly. The current OLT device can connect up to 64 ONUs in succession. In fact, the number of users in a community often exceeds this number. In this case, it is often necessary to add OLT at the central office. and correspondingly increase the number of optical fibers. Many residential areas have already laid optical cables during construction. If they are re-laid, the construction will be difficult and costly.

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