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System and method for achieving network reconfigurability of mixed WDM (Wavelength Division Multiplexing)/TDM (Time Division Multiplexing) PON (Passive Optical Network)

A technology of passive optical network and time division multiplexing, which is applied in the direction of time division multiplexing system, multiplexing system selection device, transmission system, etc., to achieve good reliability, extend transmission distance, and increase the number of network users Effect

Inactive Publication Date: 2012-08-15
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the structural configuration of the remote node RN and the state switching of a series of optical switches, the new hybrid WDM / TDM-PON system can not only overcome the uplink signal transmission problems caused by the existing methods to achieve network reconfiguration performance, but also solve Reconfigurability issues in network failures not resolved in existing methods

Method used

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  • System and method for achieving network reconfigurability of mixed WDM (Wavelength Division Multiplexing)/TDM (Time Division Multiplexing) PON (Passive Optical Network)
  • System and method for achieving network reconfigurability of mixed WDM (Wavelength Division Multiplexing)/TDM (Time Division Multiplexing) PON (Passive Optical Network)
  • System and method for achieving network reconfigurability of mixed WDM (Wavelength Division Multiplexing)/TDM (Time Division Multiplexing) PON (Passive Optical Network)

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Embodiment one: see figure 1 , in this hybrid wavelength division multiplexing / time division multiplexing passive optical network system for realizing network reconfigurability, the optical line terminal OLT 1 ​​communicates with n remote The nodes RN 14 are connected sequentially as the wavelength division multiplexing part of the system; and each remote node RN 14 is connected to m optical network units ONU 16 through the distribution optical fiber 15 respectively, as the time division multiplexing part of the system, and n and m are respectively A natural number other than zero. Among them, the optical line terminal OLT 1 ​​is composed of TDM-PON burst module transmitter 2 under n different wavelength channels, burst module receiver 8 under n different wavelength channels, 2 arrayed waveguide gratings 3, 7, and 2 doped Composed of erbium fiber amplifiers 4, 6, a first optical circulator 5 and three 1*2 optical switches 9, 10, 11. n TDM-PON burst module transmitters...

Embodiment 2

[0018] Embodiment two: adopt above-mentioned figure 1 and figure 2 In the system shown, the specific method for realizing network reconfigurability in this hybrid WDM / TDM passive optical network is as follows: during communication, in the normal working mode, each of the optical line terminal OLT and the remote node RN The switch state is shown in the attached figure. First, all downlink signals from the TDM-PON burst module transmitter 2, including n wavelength channels, pass through the first arrayed waveguide grating 3, the first erbium-doped fiber amplifier 4, the first optical circulator 5, the first 1 *2 Optical switch 9 and the second 1*2 optical switch 10 are transmitted to the RN from the upper branch of the working optical fiber 12 on the feeder optical fiber ring 1 14, based on wavelength λ 1 -λ n All downlink signals enter the remote node RN 1 After 14, the wavelength is λ 1 -λ n All downlink signals of the RN are divided into two parts, and part of the do...

Embodiment 3

[0020] Embodiment three: using the above figure 1 and figure 2 In the system shown, the specific method for realizing the reconfigurability of the network in terms of security in this hybrid wavelength division multiplexing / time division multiplexing passive optical network is as follows: 1) If the optical line terminal OLT 1 ​​described in the second embodiment and remote node RN 1 If the working feeder fiber 12 between 14 fails, it is necessary to switch the state of the 1st*2 optical switch 9 in the optical line terminal OLT 1, so that the transmission of the downlink signal can start from the lower branch of the working feeder fiber. At the same time, The 2*2 optical switches 18 in all remote nodes RN 14 also need to switch to the cross state, so that the signal can be transmitted from the RN n to RN 1 get a smooth transfer. In this protection mode, the transmission mode of the signal is the same as the transmission mode in the normal mode described in Embodiment 2, ...

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Abstract

The invention discloses a system and a method for achieving network reconfigurability of a mixed WDM (Wavelength Division Multiplexing) / TDM (Time Division Multiplexing) PON (Passive Optical Network). In the system, one optical line terminal is adopted and is sequentially connected with n remote end nodes through double fiber feeder lines, and all remote end nodes are respectively connected with moptical network units by using a shunt through distributed optical fibers; wherein each remote end node adopts one reconfigurable optical add / drop multiplexer based on a wavelength blocker and a tunable optical filter technology so as to realize the function of reconfiguring a network downlink signal wavelength resource, the reconfiguration of an uplink is realized by utilizing a wavelength re-modulation technology based on a reflection type semiconductor optical amplifier, and meanwhile, the system can improve the network reconfiguration property when confronting certain optical fiber faults. The method ensures that in the network, the wavelength resource of the network can be flexibly reconfigured according to changing bandwidth requirements, and meanwhile, the reconfiguration capability of the mixed PON on confronting emergencies can be realized by using one backup feeder line optical fiber loop and a series of switch transformation, thereby ensuring the network to be with better reliability.

Description

technical field [0001] The present invention relates to a hybrid wavelength division multiplexing / time division multiplexing passive optical network WDM / TDM-PON, in particular to a system for realizing network reconfigurability of a hybrid wavelength division multiplexing / time division multiplexing passive optical network and methods. Background technique [0002] Hybrid wavelength division multiplexing / time division multiplexing passive optical network combines the advantages of time division multiplexing and wavelength division multiplexing, and makes up for the simple time division multiplexing passive optical network TDM-PON and wavelength division multiplexing passive optical network. The respective shortcomings of the optical network WDM-PON can realize the upgrade from the existing TDM-PON to the future WDM-PON. However, with the advent of large-capacity intelligent converged network access requirements, the network structure of PON not only needs to be cost-effectiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04Q11/00H04J3/08
Inventor 曹娅楠甘朝钦阮浩杨登峰李凡帆
Owner SHANGHAI UNIV
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