Device and method for estimating optical fiber chromatic dispersion through low-speed coherent detection and neural network

A neural network and optical fiber dispersion technology, applied in the field of communication, can solve problems such as bit rate opacity, pilot or training sequence, and large amount of calculation, and achieve the effect of reducing the implementation cost

Active Publication Date: 2019-02-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of existing optical fiber link dispersion estimation methods that require pilots or training sequences, large calculations, or opaque bit rates, and propose a device and method for low-speed coherent detection and neural network estimation of optical fiber dispersion. Low-speed cohere...

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  • Device and method for estimating optical fiber chromatic dispersion through low-speed coherent detection and neural network
  • Device and method for estimating optical fiber chromatic dispersion through low-speed coherent detection and neural network
  • Device and method for estimating optical fiber chromatic dispersion through low-speed coherent detection and neural network

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Embodiment 1

[0052] This embodiment 1 describes the device and method for low-speed coherent detection and neural network estimation of optical fiber dispersion of the present invention. The principle and device composition and function of optical fiber communication link dispersion are estimated. Use the data preprocessing unit to preprocess the data set;

[0053] Such as figure 1 with figure 2 As shown, the low-speed coherent detection unit is used to perform low-speed sampling of optical signals transmitted through optical fiber links under different conditions; obtain I and Q discrete digital sequences under different transmission conditions, and build them into a data set; input the data set into the data The preprocessing unit outputs a fixed-length data set; the data set classification unit is used to divide the preprocessed data set into a training set and a test set. Construct the neural network unit, set the neural network parameters; use the training set to train the constructed ...

Embodiment 2

[0055] In order to make the objectives, technical solutions, and advantages of an apparatus and method for estimating the dispersion of optical fiber communication links by using low-speed coherent detection and neural network algorithms of the present invention clearer, the following describes the embodiments of the present invention with reference to the drawings in the second embodiment of the present invention. A clear and complete description of the technical solutions in:

[0056] image 3 It is the simulation system diagram of this embodiment 2. As can be seen from the figure, it includes the light emitting end 1, EDFA 2, 4, M fiber spans (one span contains 100km single-mode fiber and an EDFA) 3, Set OSNR module 5. This device 6.

[0057] The optical transmitter 1 is used to transmit QPSK and 16QAM signals; the input interface of the optical amplifier 2 is connected to the output interface of the transmitter 1, and is used to adjust the transmit power of the transmitter; the...

Embodiment 3

[0080] The third embodiment verifies that the present invention is robust to ASE and nonlinear noise when estimating the dispersion in the optical fiber communication link. The specific implementation is to change the OSNR and transmit power respectively to change the influence of ASE and nonlinear noise on optical signal transmission, and to observe the change of the dispersion estimation result in the optical fiber communication link.

[0081] among them, Figure 7 In order to change ASE and nonlinear noise, the result of dispersion estimation of QPSK and 16QAM optical signals transmitted by optical fiber links. Figure 7 (a) and (c) are the results of the dispersion estimation of QPSK and 16QAM signals by changing the ASE noise; Figure 7 (b)(d) are the results of the dispersion estimation of QPSK and 16QAM signals by changing the ASE noise. Figure 7 (a)(c) The abscissa is OSNR, the left vertical axis is the dispersion value, and the right vertical axis is the dispersion refere...

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Abstract

The invention relates to a device and method for estimating optical fiber chromatic dispersion through a low-speed coherent detection and neural network, and belongs to the technical field of the communication. The method comprises the following steps: step one, performing low-speed detection on an optical signal after being transmitted through an optical fiber link by using a low-speed detectionunit, producing a data set through a data preprocessing unit, and dividing the data set into a training set and a test set by using a data set classification unit; step two, constructing a neural network unit, setting a neural network parameter, and training the constructed neural network by using the training set produced in the step one; step three, estimating the chromatic dispersion of the test set divided in the step one by using the neural network unit trained in the step two, wherein the estimation method comprises the step of performing weighted average by using the output of the neural network unit and the reference chromatic dispersion. The chromatic dispersion estimation on the signal sampled in low rate is realized, the receiving end cost is greatly reduced, the defect that thecyclic training sequence signal is required for performing chromatic dispersion estimation is solved, and an operation of changing a transmitting end is unnecessary.

Description

Technical field [0001] The invention relates to a device and method for low-speed coherent detection and neural network estimation of optical fiber dispersion, belonging to the technical field of communication. Background technique [0002] The optical transmission network is developing towards ultra-long transmission distance and ultra-large capacity. With the increase of the channel transmission rate and the extension of the transmission distance, the dispersion and nonlinearity in the optical fiber seriously restrict the performance of optical communication systems and networks. With the widespread application of digital signal processing technology, dispersion equalization technology effectively compensates for the degradation of optical communication signals caused by dispersion. But the premise of chromatic dispersion equalization is to accurately estimate the cumulative chromatic dispersion of the optical fiber communication link. [0003] Fiber dispersion monitoring metho...

Claims

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Application Information

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IPC IPC(8): H04B10/079
CPCH04B10/07951
Inventor 杨爱英郭少健
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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