Passive optical network system and downlink transmission method thereof

A technology of passive optical network and optical network unit, which is applied in the field of passive optical network system and its downlink transmission to achieve the effect of saving upgrade cost and improving upgrade efficiency

Inactive Publication Date: 2012-05-02
李亚泽
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The embodiment of the present invention provides a passive optical network system to solve the problem of flexible upgrading of the passive optical network; at the same time, the embodiment of the present invention also provides a downlink transmission method of the above-mentioned passive optical network system

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  • Passive optical network system and downlink transmission method thereof
  • Passive optical network system and downlink transmission method thereof
  • Passive optical network system and downlink transmission method thereof

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Embodiment Construction

[0021] figure 1 It is a schematic diagram of network architecture of a passive optical network (PON) system adopting a time division multiplexing (TDM) mechanism. The passive optical network system may include an optical line terminal (OLT), an optical distribution network (ODN), and a plurality of optical network units (ONUs).

[0022] Wherein, the direction from the OLT to the ONU is defined as a downlink direction, and the direction from the ONU to the OLT is defined as an uplink direction. In the downlink direction, the OLT broadcasts the downlink data to the multiple ONUs in a time division multiplexing manner, and each ONU only receives data carrying its own identification; and in the uplink direction, the multiple ONUs use time division multiple access (TDMA, TimeDivisionMultiplexingAccess) mode communicates with the OLT, and each ONU sends uplink data strictly according to the time slot allocated by the OLT.

[0023] The passive optical network system may be a commun...

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Abstract

The embodiment of the invention discloses a passive optical network system and a downlink transmission method thereof. The passive optical network system comprises an optical line terminal, an optical distribution network and a plurality of optical network units. The optical line terminal is used to send a downlink multi-wavelength optical signal composed of a plurality of downlink optical signal wavelength division multiplexing having different wavelengths, and the optical distribution network comprises a first-stage optical splitter, a plurality of second-stage optical splitters and a plurality of filter modules. The first-stage optical splitter is used to divide a downlink multi-wavelength signal sent by the optical line terminal into a plurality of downlink multi-wavelength signals, the plurality of filter modules are used to carry out filter processing on the plurality of downlink multi-wavelength signals to obtain a downlink single wavelength optical signal of which the wavelength corresponds to a channel central wavelength; wherein, the channel central wavelengths of the plurality of filter modules respectively correspond to the plurality of downlink optical signals having different wavelengths, the second-stage optical splitters are used to carry out spectral processing on the downlink single wavelength signal and then provide the downlink single wavelength signal to the optical network unit.

Description

technical field [0001] The present invention relates to passive optical network (PON, Passive Optical Network) technology, in particular to a passive optical network system and a downlink transmission method thereof. Background technique [0002] The passive optical network system may include at least one optical line terminal (OLT, Optical Line Terminal), multiple optical network units (ONU, Optical Network Unit) and an optical distribution network (ODN, Optical Distribution Network). The OLT is connected to the multiple ONUs in a point-to-multipoint manner through the ODN, and communicates with the multiple ONUs in a time division multiplexing (TDM, TimeDivisionMultiplexing) manner. [0003] Passive optical network has been widely used due to its low cost, simple maintenance and ability to provide very high bandwidth. However, with the emergence of new services, the user's demand for bandwidth is increasing day by day, while the traditional PON system adopts the TDM mecha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00H04B10/12
CPCH04J14/0282H04J14/0246H04J14/0252H04J14/0286H04J14/0247H04Q2213/1301
Inventor 卫国程宁王峰
Owner 李亚泽
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