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Multi-granularity hybrid optical orthogonal mode division multiplexing access system

An access system, orthogonal mode technology, applied in the field of communication, to achieve the effect of improving transmission capacity, high capacity and high transmission rate

Pending Publication Date: 2020-07-17
NANJING UNIV OF INFORMATION SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a multi-granularity mixed optical orthogonal mode division multiplexing access system to solve the practical problems raised in the above-mentioned background technology

Method used

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Embodiment Construction

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0025] see figure 1 and image 3 , taking the 3-mode optical fiber communication system as Embodiment 1 of the present invention, after the terminal is firstly mapped to the constellation, different chips are allocated according to different needs of users, the downlink channel is spread with chips, and then allocated to a given sub carrier to generate an OFDM frame, which is realized by an inverse fast Fourier transform. Each chip is encoded by a Walsh code, and...

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Abstract

The invention provides a novel passive optical network access system based on optical orthogonal mode division multiplexing and code division multiplexing orthogonal frequency division multiplexing, so that different users / services can occupy the same subcarrier at the same time, and interference among different users / services caused by high code correlation can be eliminated.. In addition, the code gain is very high, the loss of the power divider can be resisted, the optical orthogonal mode division multiplexing method is provided, so that more users are supported, beat noise among differentusers is reduced, meanwhile, the multimode optical fiber is adopted as a transmission medium, each mode can independently transmit signals from a terminal to the users, the optical orthogonal mode division multiplexing method is provided, crosstalk among the modes is eliminated, and the information transmission quality of the system is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a multi-granularity hybrid optical orthogonal mode division multiplexing access system. Background technique [0002] Orthogonal frequency division multiplexing passive optical network is regarded as an effective solution for future broadband access networks due to its high spectral efficiency, high dispersion tolerance, and flexibility in multiple service provisioning and dynamic bandwidth allocation. In recent years, much research and development has focused on OFDM PONs, such as hybrid WDM-OFDM PONs and hybrid TDM-OFDM Passive optical network. However, the WDM-OFDM passive optical network system requires a large number of high-speed OFDM transceivers and arrayed waveguide gratings to distribute the broadband among the optical network units, which not only increases the system cost and complexity, but also lacks Flexibility to dynamically allocate resources ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/04H04B10/516H04B10/25H04L27/34
CPCH04J14/04H04B10/5165H04L27/34
Inventor 刘博忻向军任建新毛雅亚渠松松王瑞春沈磊李良川周锐王光全吴泳锋孙婷婷赵立龙
Owner NANJING UNIV OF INFORMATION SCI & TECH
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