Method and device for prolonging transmission distance of passive optical network

A passive optical fiber network and transmission distance technology, which is applied in the field of optical communication research, can solve the problems of limiting the access network access distance and access bandwidth, fading, etc., and achieve the effects of low cost, obvious compensation effect, and bright application prospects

Active Publication Date: 2014-05-21
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Therefore, fiber dispersion will also introduce frequency selective fading to the signal in the non-coherent detection system, thereby limiting the access distance and access bandwidth of the access network

Method used

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  • Method and device for prolonging transmission distance of passive optical network
  • Method and device for prolonging transmission distance of passive optical network
  • Method and device for prolonging transmission distance of passive optical network

Examples

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Embodiment 1

[0026] This embodiment adopts as figure 1 The shown device includes a signal input device at the sending end, a digital-to-analog converter, an intensity modulator, an optical fiber, an amplifier, a photodetector, an analog-to-digital converter and a digital signal processing device connected in sequence, and the laser is also connected to the intensity modulator.

[0027] In this embodiment, the schematic diagram of the sinusoidal signal spectrum theoretically output by the digital-to-analog converter (DAC) is as follows figure 2 shown. The sampling frequency of the DAC is Fs. Due to the sample-and-hold characteristics of the DAC, after passing through the DAC, the signal output by the DAC not only contains the original signal spectrum Fout, but also contains the image spectrum of the signal in the high frequency. For example, the frequency of the first-order image signal is Fs-Fout, and the frequency of the second-order image signal is Fs+ Fout, the third-order image sign...

Embodiment 2

[0030] In this example, Figure 4-6 In an actual optical communication system, before optical fiber transmission ( Figure 4 ), after optical fiber transmission ( Figure 5 ) and after downsampling to double the symbol rate ( Figure 6 ) example of a signal spectrum. This example also uses the figure 1 The device shown is used to extend the transmission distance of the passive optical fiber network, including a signal input device at the sending end, a digital-to-analog converter, an intensity modulator, an optical fiber, an amplifier, a photodetector, an analog-to-digital converter and a digital signal connected in sequence The processing means, the laser is also connected to the intensity modulator. It differs from Embodiment 1 in the transmitted signal. The signal transmitted in this example is an Orthogonal Frequency Division Multiplexing (OFDM) signal. Signals without dispersion compensation after optical fiber transmission, such as Figure 5 shown, with Figure 4...

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Abstract

The invention discloses a method and a device for prolonging the transmission distance of a passive optical network. The method comprises the steps that the sampling band width of an analog-digital converter at a receiving end is more than the symbol rate of a transmitted signal, corresponding spectrum aliasing is generated when the output signal of the analog-digital converter is sampled, and the frequency ingredient outside a transmitting signal frequency range in the sampled signal of the analog-digital converter is used for compensating the frequency ingredient of a power attenuation part after the optical fiber dispersion, so as to realize the compensation on the optical fiber transmission dispersion in the passive optical network. According to the method, the receiving bandwidth can be increased, the compensation on the optical fiber transmission dispersion in the passive optical network can be conveniently and effectively realized, and the method has the characteristics of being simple to realize, low in cost, significant in compensation effect, and is capable of greatly improving the signal quality of the receiving end.

Description

technical field [0001] The invention relates to the field of optical communication research, in particular to a method and a device for extending the transmission distance of a passive optical fiber network. Background technique [0002] From the perspective of the entire network structure at present, the application of new technologies such as the laying of a large number of optical fibers and Dense Wavelength Division Multiplexing (DWDM) has made breakthroughs in the development of the backbone network. At the same time, due to the advancement of Ethernet technology, the bandwidth of the LAN dominated by it has gradually increased from 10M, 100M to 1G or even 10G. At present, the place where the research most needs a breakthrough lies in the section between the network backbone, the local area network and the home users, which is often referred to as the "last mile", which is a bottleneck. To break this bottleneck, the currently accepted solution is the passive optical fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/2513H04Q11/00
Inventor 郭昌建戴龙玲
Owner SOUTH CHINA NORMAL UNIVERSITY
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