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MGDM multimode optical fiber communication system and method based on ICA signal separation algorithm

An optical fiber communication system and multi-mode optical fiber technology, applied in the field of communication, can solve the problems of bandwidth occupation, difficult hardware implementation, and large amount of calculation

Inactive Publication Date: 2010-06-30
JILIN UNIV
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Problems solved by technology

The separation of MGDM system output signals generally adopts zero-forcing algorithm, maximum likelihood estimation, etc. These methods need to measure the channel matrix information with the help of pilot signals, and use its inverse matrix to demultiplex at the receiving end, which requires a large amount of calculation and hardware implementation. Difficult, and the pilot signal generally adopts frequency division multiplexing, occupying a certain bandwidth, resulting in low bandwidth utilization, reducing the transmission efficiency of the system, and it is very likely to amplify the noise

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  • MGDM multimode optical fiber communication system and method based on ICA signal separation algorithm
  • MGDM multimode optical fiber communication system and method based on ICA signal separation algorithm
  • MGDM multimode optical fiber communication system and method based on ICA signal separation algorithm

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Embodiment 1

[0049] Embodiment 1, digital video and digital signal transmission simultaneously

[0050] MGDM is a relatively new technology, and there is no corresponding commercial dedicated device. The present invention has set up the actual system that is easy to realize, sets up the (IM-DD) MGDM experiment system of a 2 * 2 intensity modulation-direct detection, as figure 2 shown.

[0051] The manufacturing method of the mode multiplexer is as follows: the central excitation connector is made by fusion splicing the single-mode fiber (SMF) and the gradient multimode fiber (GI-MMF) to the center (or the eccentricity is 0 μm) to achieve low The excitation of the first-order mode group; the bias excitation connector is made by welding SMF and GI-MMF with an eccentricity of about 26 μm, which is used to realize the excitation of the higher-order mode group. Use a 2×1 fused tapered multimode fiber coupler with a splitting ratio of 50 / 50 to couple the separately excited low-order mode grou...

Embodiment 2、70

[0053] Embodiment 2, CMI codes of 70Mb / s and 140Mb / s are simultaneously transmitted and demultiplexed

[0054] (1) Separation of mixed signals using symmetric orthogonalization FstICA algorithm based on negative entropy

[0055] The 70Mb / s and 140Mb / s CMI code digital signals are simultaneously transmitted using the above-mentioned MGDM test device. These two digital signals are generated by the PTA5102-002 signal source and the random code generator of HP 37717A respectively, and are processed by the signal processing module at the receiving end. Figure 5 is the original digital signal image before transmission. Figure 6 (a) is the received signal image after transmission by the system (the eccentricity of the offset detection connector is 26 μm), the upper part of the figure is the received 70Mb / s signal, and the lower part is the 140Mb / s signal. As a comparison, in order to observe the transmission effect when the receiving end chooses to change the detection position, ...

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Abstract

The invention relates to a mode group diversity multiplexing (MGDA) multimode optical fiber communication system and a channel demultiplexing method based on independent component analysis (ICA). The system comprises a signal generating module, a mode group multiplexing module, a mode group transmitting module, a mode group detecting module and a signal processing module. Data acquisition is carried out on the detected multiplex mixed signals by the signal processing module, thus obtaining a mixed signal matrix xn*T, then processing is carried out by applying the channel demultiplexing method based on the independent component analysis (ICA) and adopting a symmetrical orthogonalization FstICA algorithm based on negative entropy, then signs and orders of separated signals are identified according to an identification principle, thus ensuring the obtained separated signals and source signals to be accordant. The system and the method solve an inherent defect of blind signal separating technology, namely, uncertainty of the signal orders and signs. The system and method enhance the applicability of the symmetrical orthogonalization FstICA algorithm based on the negative entropy.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a mode group diversity multiplexing (MGDM) multimode optical fiber communication system and a channel demultiplexing method based on independent component analysis (ICA). Background technique [0002] In recent years, the rapid development of broadband integrated services such as the Internet and multimedia services has put forward higher and higher requirements for communication networks, and the "last mile" problem of communication networks has attracted more and more attention from the industry. Due to the advantages of large numerical aperture, easy connection, and low cost of supporting components, it has become an ideal medium for short-distance communication. MGDM opens up independent parallel communication channels by selecting and stimulating different mode groups to realize multiple service integration, such as: voice service, data transmission, video ...

Claims

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Application Information

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IPC IPC(8): H04B10/13H04B10/2581
Inventor 胡贵军刁国影崔云鹏王晋飞
Owner JILIN UNIV
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