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Method and system for transmitting upstream signals of passive optical access network user

A signal transmission system and access network technology, applied in the field of passive optical access network user uplink signal transmission method and system, capable of solving problems such as signal-to-noise ratio decrease, system complexity and cost increase, and orthogonal characteristic deterioration , to achieve the effect of reducing system cost

Active Publication Date: 2013-05-22
HUAZHONG UNIV OF SCI & TECH
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  • Description
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AI Technical Summary

Problems solved by technology

Frequency offset and phase noise will deteriorate the orthogonality between subcarriers, and a frequency offset of only 1% will reduce the signal-to-noise ratio by 30dB
Therefore, the OFDM system is sensitive to frequency offset and phase noise, which increases the complexity and cost of the system

Method used

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  • Method and system for transmitting upstream signals of passive optical access network user
  • Method and system for transmitting upstream signals of passive optical access network user
  • Method and system for transmitting upstream signals of passive optical access network user

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] The embodiment of the signal transmission method of the present invention is used for 2 users, including a signal transmitting step and a signal receiving step:

[0045] (1) The signal transmitting step includes the following sub-steps:

[0046](1.1) Set up two different orthogonal waveform generators, and the two orthogonal waveform generators generate the first-order and second-order orthogonal waveforms respectively, and the orthogonal waveforms of each order are orthogonal to each other;

[0047] (1.2) The information of two different users is respectively modulated onto the first-order and second-order orthogonal waveforms generated by two orthogonal waveform generators;

[0048] (1.3) Superimposing the two modulated electrical quadrature waveform signals to form a mixed electrical signal;

[0049] (1.4) Modulating the mixed electrical sig...

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Abstract

The invention discloses a method and a system for transmitting upstream signals of a passive optical access network user, belongs to the technical field of fiber optical communication, and solves the problem about upstream signal conflicting of the user so as to improve transmission rate. The method includes: respectively modulating user information on N orthogonal waveform generators, converting into composite output optical signals via a laser; converting the received composite output optical signals into composite electrical signals, and separating N paths of same sub composite electrical signals to recover N paths of different user information. In the system, a signal transmitting terminal comprises N different orthogonal waveform generating circuits, an electric combiner and the laser, a signal receiving terminal comprises a photoelectric detector, an electric branching unit, N relative circuits, N judging regenerative circuits and the N orthogonal waveform generators. Requirements for frequency offset and phase noise are low, dependence on electronic chips is reduced, access capability of user-side data is greatly improved, and the structure and the protocol of a passive optical access network are simplified.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and in particular relates to a method for transmitting an uplink signal of a passive optical access network user in an optical fiber to the home system and a system thereof. Background technique [0002] At present, in the passive optical access network technology in the fiber-to-the-home system, the core technology is divided into three parts: downlink signal transmission, passive access, and uplink signal transmission / reception. Due to the use of the passive optical access network (PON) structure, the downlink signal uses one transmission and multiple receptions, while the uplink signal is shared by multiple users on one optical fiber. Conflicts occur during transmission. In order to solve the problem of multiple uplink signal conflicts, the current PON structure proposes many implementation methods: time division multiplexing passive optical network (TDM-PON), wavelength di...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B10/516H04B10/60
Inventor 李洵李蔚
Owner HUAZHONG UNIV OF SCI & TECH
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