Method and system for upgrading passive optical network

A passive optical network and optical network unit technology, which is applied in the field of passive optical network upgrade methods and systems, can solve the problems of increased equipment costs, increased difficulties in implementing WDM-PON network spectrum transfer technology, and no consideration of upgrades, etc., to achieve Effects of reduced maintenance, reduced initial investment costs, and reduced risks

Active Publication Date: 2007-12-26
HUAWEI TECH CO LTD
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  • Description
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Problems solved by technology

[0009] 3) When the transmission bandwidth of the original TDMA-PON network is relatively wide, it will make it more difficult to realize the spectrum moving technology of the WDM-PON network;
[0010] 4) The WDM-PON network needs to add additional line coding, which increases the cost of the equipment accordingly;
[0015] 2) This technical solution adopts an implementation method of the WDM-PON system, which uses a wavelength different from that of the TDMA-PON band, and does not consider how to use the wavelength resources of the original TDMA-PON network to upgrade the network

Method used

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  • Method and system for upgrading passive optical network
  • Method and system for upgrading passive optical network
  • Method and system for upgrading passive optical network

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Embodiment 1

[0058] 1. Realization of downlink bandwidth expansion of TDMA-PON network:

[0059] The original TDMA-PON network system is a time-division multiplexing system, and multiple users transmit information on a shared wavelength. Due to the limitation of single wavelength and uplink burst receiving technology, the transmission rate of TDMA-PON network is difficult to develop to a higher rate. To expand the transmission bandwidth of the original TDMA-PON network, it is necessary to consider the expansion of the wavelength. The transmission bandwidth of the TDMA-PON network can be increased by using multiple wavelengths for transmission instead of the original transmission mode of one wavelength.

[0060] The technical scheme of the invention is realized by combining the wiring method of the optical fiber distribution network ODN and the WDM technology of wavelength division multiplexing. By subdividing the downlink transmission wavelength of the original network (TDMA-PON standard...

Embodiment 2

[0075] The present invention can also be realized in another way, which is to expand the bandwidth of the original TDMA-PON network through wavelength conversion, and the realization structure is shown in FIG. 9 . Each group of TDMA-PON users adopts a separate uplink and downlink wavelength respectively. For example: the uplink wavelength λu of the first group of users is converted to λu1, and the downlink wavelength λd is converted to λd1. By analogy, the uplink wavelength λu of the fourth group of users is converted to λu4, and the downlink wavelength λd is converted to λd4.

[0076] This embodiment is another way of implementing TDMA-PON network upgrade. The multiplexing of multiple groups of TDMA-PON users is realized by adding a level of WDM.

[0077] Since the uplink and downlink of each group of users in the original TDMA-PON network use the same wavelength, in order to realize the multiplexing of these user groups using the same wavelength, it is necessary to replace...

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Abstract

The method includes: using the spreading fiber possessing two stage branches; dividing the down-going band of the passive optical net into multiple wave-lengths; dividing all users into several corresponding user groups; each user group sharing a divided wave-length. The invention realizes the transferring bandwidth expansion of the current time division multiplexing passive optical net (TDMA-PON) and the gradual transition from TDMA-PON to the wave division multiplexing passive optical net (WDM-PON). Thus without changing the user terminal device ONU, the user transmission bandwidth can be increased, both reducing cost and lowering risks.

Description

technical field [0001] The invention relates to a passive optical fiber access technology, in particular to an upgrading method and system for a passive optical fiber network. Background technique [0002] At present, optical fiber access has become the main means for people to solve the bandwidth bottleneck of the access network. Optical fiber access can not only meet the bandwidth required by people's future broadband integrated services, but also the bandwidth provided by optical fiber is unmatched by existing transmission media such as copper wires and wireless transmission. The traditional point-to-point optical fiber access network, in addition to high wiring costs, also requires high operation and maintenance costs due to the need for external active devices. Passive Optical Network (PON, Passive Optical Network) is a point-to-multipoint tree-like network structure, the network structure is simple, optical fiber resources can be shared, the cost is low, and no active...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/02
CPCH04J14/02H04J3/1694
Inventor 黄伟林华枫王运涛赵峻王峰江涛
Owner HUAWEI TECH CO LTD
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