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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

Inactive Publication Date: 2012-10-03
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
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Problems solved by technology

However, the above two algorithms are only applicable to the dynamic allocation of the upstream bandwidth of the PON network

Method used

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

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Embodiment Construction

[0018] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0019] still attached figure 1 The shown multi-wavelength shared WDM-PON system is taken as an example. It is assumed that there are 4 dedicated wavelength channels, 1 shared wavelength channel and 4 ONUs in the multi-wavelength shared WDM-PON structure; 1Gbps); the dedicated wavelength and the shared wavelength use C-band (1530nm-1560nm) and L-band (1560nm-1600nm) respectively, and the colorless ONU technology is adopted at the ONU end, so that the ONU can receive data on the dedicated wavelength and the shared wavelength channel .

[0020] In the traditional WDM-PON network structure, each wavelength service queue should satisfy the following relationship:

[0021]

[0022] In a multi-wavelength shared WDM-PON network, each dedicated wavelength pair satisfies the following relationship:

[0023]

[0024] in, on the dedicated wavelength chan...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/02H04Q11/00
Inventor 沈建华邢盈盈
Owner NANJING UNIV OF POSTS & TELECOMM
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