ONU (Optical Network Unit) discovery ranging method and system in TDM (Time Division Multiplexing) PON (Passive Optical Network)

A ranging method and a ranging system technology are applied in the field of optical communication to achieve the advantages of power consumption, reduce jitter and delay.

Active Publication Date: 2020-11-06
FENGHUO COMM SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method and system for ONU discovery and distance measurement in TDM PON, which uses baseband remodulation optical top adjustment technology and adopts technologies such as optical power superposition to solve the problem of multi-point to point to send function

Method used

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  • ONU (Optical Network Unit) discovery ranging method and system in TDM (Time Division Multiplexing) PON (Passive Optical Network)
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  • ONU (Optical Network Unit) discovery ranging method and system in TDM (Time Division Multiplexing) PON (Passive Optical Network)

Examples

Experimental program
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Embodiment 1

[0043] Specifically, such as figure 1 As shown, in the existing TDM PON system of the present invention, the ONU optical transmission unit adds a top adjustment sending subunit, and the optical receiving unit of the OLT adds a top adjustment receiving subunit; the OLT optical transmission unit can optionally increase the top adjustment sending subunit, The optical receiving unit of the ONU can optionally add a top-tuning receiving sub-unit.

[0044] In TDM PON technology, the high-speed data of ONU is transmitted by TDM under the management of DBA (DBA Dynamic Bandwidth Assignment) of OLT, and the transmission time slots of different ONUs are known to OLT. Based on the above situation, although the transmission optical power of the optical transmission unit of each ONU and the distance from each ONU to the OLT are different, the optical reception unit of the OLT can obtain the received optical power from each ONU to the OLT through the optical power detection of different time...

Embodiment 2

[0047] When it is necessary to start the newly added ONU discovery and ranging process, the OLT broadcasts a discovery request message to each online and newly added ONU. After receiving the discovery request message, the newly added ONU replies with a discovery response message through the tuning mechanism to enter the discovery reply Process, after receiving the discovery response message, the OLT sends a ranging request message to the newly added ONU again, and after the newly added ONU receives the ranging request message, it replies with a ranging response message through the top adjustment mechanism and enters the ranging process.

[0048] Such as figure 2 As shown, the present invention provides a method for ONU discovery ranging in TDM PON, comprising:

[0049] S1, OLT broadcasts a discovery request message to online and newly added ONUs;

[0050] Discovery request message: it can be related messages such as Upstream_Overhead and SN request in G.984.

[0051] Genera...

Embodiment 3

[0073] Such as Figure 4 As shown, it is an ONU discovery ranging method in a TDM PON in an embodiment of the present invention, including:

[0074] Step S101: The uplink and downlink data transmission of the online ONU does not stop. The networking mode of the device is as follows: figure 1 .

[0075] Step S102: The OLT allocates time slots for sending uplink data to each online ONU.

[0076] Step S103: The OLT monitors and records the optical power corresponding to the uplink data of each online ONU according to the assigned time slot for sending uplink data of the ONU.

[0077] Step S104: The optical power corresponding to each online ONU monitored by the OLT is in a stable state.

[0078] Step S105: if image 3 As shown, the OLT periodically starts the discovery command, and sends the ranging command according to whether a new ONU joins, and superimposes the discovery command, the ranging command and the top adjustment signal on the high-speed data channel and broadca...

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Abstract

The invention discloses an ONU (Optical Network Unit) discovery ranging method in a TDM (Time Division Multiplexing) PON (Passive Optical Network). A ONU discovery ranging method comprises the following steps: an OLT (Optical Line Terminal) broadcasts a discovery request message to online and newly added ONUs; after receiving the discovery request message, the newly added ONU sends a discovery response message to the OLT through a topping mechanism; after receiving the discovery response message, the OLT determines a corresponding newly added ONU according to the discovery response message, and sends a ranging request message to the newly added ONU; after receiving the distance measurement request message, the newly added ONU replies a distance measurement response message through a top adjustment mechanism; and after the OLT receives a distance measurement response message, the distance between the newly added ONU and the OLT is calculated. According to the method, a baseband re-modulation optical topping technology is used, technologies such as optical power superposition and the like are adopted, and the function of multipoint-to-point transmission is achieved. The invention also provides a corresponding ONU discovery ranging system in the TDM PON.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and more specifically relates to a method and system for ONU discovery and ranging in TDM PON. Background technique [0002] Passive Optical Network PON (Passive Optical Network, Passive Optical Network) technology is a point-to-multipoint optical fiber access technology, which consists of OLT (Optical Line Terminal, Optical Line Terminal) Unit, Optical Network Unit), and ODN (Optical Distribution Network, Optical Distribution Network). The traditional TDM (Time-Division Multiplexing) PON system uses broadcasting technology for downlink data flow and TDM technology for uplink data flow to solve the multiplexing problem of multi-user signals in each direction. [0003] In the existing TDM PON, due to the different distances between different ONUs and the OLT, delay compensation is required to avoid transmission collisions; while delay compensation requires ranging; at the same time,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00H04J14/02
CPCH04Q11/0062H04Q11/0067H04J14/0202H04Q2011/0083
Inventor 刘新峰王志军常宇光
Owner FENGHUO COMM SCI & TECH CO LTD
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