Allocation method for downlink wavelength in shared multi-wavelength WDM-PON

A technology of WDM-PON and wavelength allocation, applied in the field of optical communication, to achieve the effect of adapting to diversity
CN102710362AInactive Publication Date: 2012-10-03NANJING UNIV OF POSTS & TELECOMM
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING UNIV OF POSTS & TELECOMM
Publication Date
2012-10-03
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses an allocation method for downlink wavelength in a shared multi-wavelength WDM-PON (Wavelength Division Multiplexing-Public Data Net Works) system, which belongs to the field of optical communication technology. The shared multi-wavelength WDM-PON system comprises a optical line terminal (OLT) and a plurality of optical network units connected with the OTL through optical fiber, wherein each of the optical network units is allocated with a dedicated wavelength; each unit optical network unit can use the dedicated wavelength thereof and at least one sharing wavelength to receive downlink data; service is pre-divided into a high priority and a low priority; wavelength allocation is based on the principle of giving priority to the dedicated wavelength when new service packet comes; the OLT periodically polls the queue of each wavelength and reallocates the wavelength according to the queue of each wavelength; and the wavelength reallocation is based on the principle of the high priority service preempting the dedicated wavelength. According to the allocation method for downlink wavelength in the shared multi-wavelength WDM-PON provided by the invention, a wavelength reallocation mechanism is introduced to guarantee QoS (Quality of Service) of different service so as to better adapt to demand diversity of different user service.
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Description

technical field

[0001] The present invention relates to a wavelength allocation method in a passive optical network, in particular to a downlink dynamic wavelength allocation method in a multi-wavelength sharing type WDM-PON (wavelength division multiplexing passive optical network) system, which belongs to optical communication technology field. Background technique

[0002] Passive optical network (PON) is one of the important realization technologies of optical access network. Compared with the widely used passive optical network based on time division multiplexing (TDM-PON), WDM-PON has the advantages of simple structure and bandwidth allocation. Flexibility and other advantages are the main development direction of the future PON system. With the rapid development of high-bandwidth services including high-definition television (HDTV), the traffic demand in the access network has increased significantly, which will easily lead to increased network load and network conge...

Claims

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