Optical fiber wideband access system and optical network unit based on WDM structure

An optical network unit and wavelength division multiplexing technology, applied in wavelength division multiplexing systems, electromagnetic wave transmission systems, optical fiber transmission, etc., can solve the problems of increased system communication capacity, inability to meet broadband communication, and increased access costs , to achieve the effect of large number of user access, lower access cost, and low-cost upgrade

Inactive Publication Date: 2009-07-01
上海鼎频通信技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, although the method of using ADP receiver or optical amplifier can increase the number of optical branches, the increase in the number of branches does not mean that the communication capacity of the system will also increase linearly, such as the existing precursor based on time division multiplexing. Passive optical network (GPON) technology, when the number of users increases to 512 households, the average uplink signal rate per household is only 1000 / 512=1.95M, which cannot meet the needs of broadband communication
In addition, the configuration of APD receiver and optical amplifier also increases the system cost, thus increasing the access cost per household

Method used

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  • Optical fiber wideband access system and optical network unit based on WDM structure
  • Optical fiber wideband access system and optical network unit based on WDM structure
  • Optical fiber wideband access system and optical network unit based on WDM structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, a fiber optic broadband access system based on a wavelength division multiplexing structure, including an optical line terminal OLT, an optical splitter OS, and a plurality of optical network nodes ONT (represented by letters 1 to n here), wherein the signal of the OLT The input and output terminals are connected to the common terminal 10 of the OS, and the n branches of the OS are respectively connected to n ONT modules.

[0028] Such as image 3 As shown, the OLT includes:

[0029] A standard wavelength selectable light source WGS is used to generate various light wave signals required for system transmission;

[0030] A wavelength selective modulator WSM for data modulation of a specific wavelength channel;

[0031] a wavelength selective receiver WSR for receiving communication data of a specific wavelength channel;

[0032] Wherein, the WGS transmitting end is connected with the optical port of the WSM, and the optical receiving end o...

Embodiment 2

[0043] Such as figure 1 As shown, a fiber optic broadband access system based on a wavelength division multiplexing structure, including an optical line terminal OLT, an optical splitter OS, and a plurality of optical network nodes ONT (represented by letters 1 to n here), wherein the OLT The signal input and output terminals are connected to the common terminal 10 of the OS, and the n branches of the OS are respectively connected to n ONT nodes.

[0044] Such as Figure 5 As shown, the OLT includes a dense wavelength division multiplexing optical transceiver module DWDM TR1, which is used to generate various optical wave signals required for system transmission, perform data modulation on a specific wavelength channel, and receive communication data at an upstream wavelength;

[0045] Wherein, the optical splitter OS can be an arrayed waveguide grating type wavelength division multiplexer, or a dielectric filter type optical wavelength division multiplexer, which is used to ...

Embodiment 3

[0054] A passive optical network unit such as Figure 4 As shown, it has the same structure as the ONU in Embodiment 1, and its detailed description is omitted here.

[0055] Based on the above, it can be seen that the present embodiment adopts the wavelength division multiplexing technology between the OLT and the ONU, which is conducive to realizing high-speed signal transmission at the ONU, so that more users can be configured, and the average access rate per household can be effectively reduced. Cost; in addition, since the configuration of the largest number of users remains unchanged compared with the existing network, it is beneficial to realize low-cost upgrade on the basis of the existing access network.

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Abstract

The invention discloses a broadband optical fiber access system based on wavelength-division multiplexing (WDM), and an optical network unit thereof. The broadband optical fiber access system comprises an optical line terminal, an optical splitter, an optical network node and a user terminal. The optical line terminal comprises a standard wavelength-selectable light source used for transmitting the required signals of various wavelengths; a wavelength-selectable modulator used for modulating specific-wavelength signals; and a wavelength-selectable receiver used for receiving specific-wavelength incident signals. The optical splitter is coupled to the optical line terminal and the optical network node and is used for distributing downlink signals and feeding back uplink signals. The optical network unit comprises an optical detector, two WDM devices, an optical transponder and an Ethernet exchanger. The broadband optical fiber access system greatly increases the number of optical division on the premise of ensuring the broadband access, thereby increasing the number of user access to the passive optical network, effectively improving the transmission efficiency and reducing the average cost of user access.

Description

technical field [0001] The invention relates to the technical field of broadband access networks, in particular to an optical fiber broadband access system and an optical network unit based on a wavelength division multiplexing structure capable of increasing the number of access users. Background technique [0002] Optical fiber broadband access network technology is a very promising technology for realizing broadband access now and in the future. With the continuous expansion of fiber-to-the-home (FTTH) and fiber-to-the-building (FTTB) applications, fiber optic broadband access network technologies will be used extensively. [0003] Existing optical fiber access network solutions usually use passive optical network technology, refer to "A Passive Optical Network System and Its Service Protection Method" (Patent Application No.: 200610034310.0) and "A Gigabit Passive Optical Network System" (Patent application number: 200510064550.0), etc., generally use time division mult...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H04B10/12H04J14/02H04L12/28H04B10/25
Inventor曹小帆张林涛冒晓平
Owner上海鼎频通信技术有限公司