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An ultra-dense wavelength division multiplexing passive optical fiber network transmission system and transmission method

A passive optical fiber network and wavelength division multiplexing technology, which is applied in the direction of wavelength division multiplexing system, optical multiplexing system, multiplexing system selection device, etc., can solve the problem that the wavelength channel below 25GHz cannot be realized Distribution and other issues, to avoid ultra-high loss, to avoid limited number of users, and to guarantee system performance

Active Publication Date: 2020-05-05
WUHAN POST & TELECOMM RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Using existing AWG (Arrayed Waveguide Grating, Arrayed Waveguide Grating) and other wavelength division multiplexing devices cannot achieve wavelength channel allocation below 25 GHz. How to ensure more splitting ratios and power budgets on the basis of existing devices has become an issue. problems that must be solved

Method used

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  • An ultra-dense wavelength division multiplexing passive optical fiber network transmission system and transmission method
  • An ultra-dense wavelength division multiplexing passive optical fiber network transmission system and transmission method

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Embodiment 1

[0039] see figure 1 As shown, the embodiment of the present invention provides an ultra-dense wavelength division multiplexing passive optical network transmission system, and the system includes an OLT end, an optical fiber link, an ODN, and N·M ONU devices.

[0040]The OLT end is used to: provide the optical fiber interface of the user-oriented passive optical fiber network, connect to the upper layer network, complete the upstream access of the PON network, and connect to the ONU device at the user end through the ODN network to realize the control and management of the ONU device at the user end and ranging functions.

[0041] The OLT end includes N M OLT transmitters, N M OLT receivers, N 1:M OLT optical couplers, N 1:M OLT optical beam splitters, and an N-channel OLT wave Division multiplexer, an N-way OLT wavelength division multiplexer and an OLT optical circulator; N·M OLT transmitters are respectively connected to the OLT wavelength division multiplexer through N OL...

Embodiment 2

[0064] On the basis of Embodiment 1, the embodiment of the present invention provides a transmission method based on an ultra-dense wavelength division multiplexing passive optical fiber network transmission system, including the following steps:

[0065] Down direction:

[0066] N·M OLT transmitters respectively send optical signals to N OLT optical couplers;

[0067] The OLT optical coupler couples N·M optical signals into N groups of optical signals, and then sends them to the OLT wavelength division multiplexer;

[0068] The OLT wavelength division multiplexer multiplexes the optical signals output by N OLT optical couplers into one optical signal, and then sends it to the optical fiber link through the OLT optical circulator, and then transmits it to the ODN;

[0069] The optical signal is sent to the ODN wave division multiplexer through the ODN total optical circulator;

[0070] The ODN wavelength demultiplexer demultiplexes the optical signal output by the ODN total ...

Embodiment 3

[0084] An embodiment of the present invention provides an ultra-dense wavelength division multiplexing passive optical fiber network transmission system, which is applied to a UDWDM-PON with a channel spacing of 50 GHz. The system includes an OLT end, an optical fiber link, an ODN and N·M ONU devices. N is the number of optical beam splitters and optical couplers, and 1:M is the coupling or multiplexing ratio of optical beam splitters and optical couplers. Among them, 3≦M≦5.

[0085] In this embodiment, N=80, M=5. The OLT side includes a wavelength division multiplexer MUX1 with 80 wavelength channels and a wavelength channel spacing of 50GHz, a wavelength division multiplexer DEMUX2 with 80 wavelength channels and a wavelength channel spacing of 50GHz, 80 sets of 1:5 Optical couplers, 80 1:5 optical beam splitters, and 1 optical circulator.

[0086] The OLT side has 400 independent PM-QPSK optical signal transmitters with a net rate of 10Gb / s (numbered OLT_TX1, OLT_TX2, .....

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Abstract

The invention discloses a transmission system for an ultra-dense wavelength division multiplexing passive optical fiber network, and relates to the technical field of high-speed optical access networks. According to the transmission system for the ultra-dense wavelength division multiplexing passive optical fiber network, a wavelength division multiplexing and demultiplexing device and an opticalbeam splitter are mixed for use, thereby avoiding the problem that high loss occurs when using the optical beam splitter alone for multiple users, and avoiding the problem that the number of users islimited when using a wavelength division multiplexer alone; meanwhile, by ingeniously designing the upstream and downstream wavelength, the bandwidth limitation of the wavelength division multiplexer / demultiplexer can be effectively avoided, so that the system performance of multipath downstream signals and multipath upstream signals in each group of wavelength division multiplexing channels are guaranteed; and a crosstalk is not introduced in a single-fiber two-way transmission, thereby remarkably improving the capacity and the number of users of the upstream and downstream access signals. The invention further discloses a transmission method based on the transmission system for the ultra-dense wavelength division multiplexing passive optical fiber network.

Description

technical field [0001] The invention relates to the technical field of high-speed optical access networks, in particular to an ultra-dense wavelength division multiplexing passive optical fiber network transmission system and transmission method. Background technique [0002] With the rise and popularization of cloud computing, Internet of Everything, high-definition / ultra-definition video, virtual reality and other large-scale services, access network traffic continues to increase, and existing optical fiber communication systems are facing enormous pressure to expand capacity. The so-called "last mile" optical access network is the closest network entrance to users, and its capacity and bandwidth will eventually become a bottleneck affecting users' online experience. With the continuous promotion of 4G, 5G wireless technology and Internet of Things services, the next-generation optical access network will develop in the direction of low cost, large capacity, long distance,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02H04Q11/00
CPCH04J14/0227H04J14/023H04J14/0245H04J14/0249H04Q11/0067
Inventor 贺志学罗鸣李响余少华
Owner WUHAN POST & TELECOMM RES INST CO LTD
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