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Multi-rate subcarrier modulation signal receiving and transmitting method and system

A subcarrier modulation, multi-rate technology, applied in the field of optical communication, can solve the problems of high peak average power, complex transmitter transceivers, low optical modulation efficiency, etc., and achieve the effect of high dispersion tolerance and flexible rate allocation

Active Publication Date: 2021-11-30
JINAN UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these schemes require complex transmitters or complex transceivers
In the intensity modulation / direct detection optical communication system, digital signal processing can also effectively compensate the spectral zero point damage caused by dispersion, but the algorithm complexity is usually high
Discrete multi-tone modulation using bit and power allocation also has some dispersion tolerance, but its peak-to-average power ratio is relatively high, resulting in low optical modulation efficiency

Method used

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  • Multi-rate subcarrier modulation signal receiving and transmitting method and system
  • Multi-rate subcarrier modulation signal receiving and transmitting method and system
  • Multi-rate subcarrier modulation signal receiving and transmitting method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0084] A multi-rate subcarrier modulation signal transmission method, used for transmitting optical modulation signals based on intensity modulation / direct detection optical communication system; such as figure 2 As shown, the multi-rate subcarrier modulation data transmission method includes the following steps:

[0085] Step S1, such as figure 1 As shown, according to the zero point information of the optical fiber dispersion channel, the number of subcarriers N is designed, and the center frequency f of each subcarrier is i and bandwidth B i , avoiding the channel zero position, generating the multi-rate subcarrier modulation signal, wherein i=1,2,...,N, the specific process is as follows:

[0086] Step S1-1, divide the bit sequence to be transmitted into N groups, and perform M on the bit stream of each group i order QAM mapping;

[0087] Step S1-2, performing shaping filtering on the I and Q components of the QAM signal of each branch, respectively, to obtain shaping...

Embodiment 2

[0106] A multi-rate subcarrier modulation signal receiving method, which is used to receive the data sent by Embodiment 1, such as figure 2 As shown, it includes the following steps:

[0107] Step S3, performing direct detection and analog-to-digital conversion on the optical signal transmitted through the optical fiber to obtain a digital signal;

[0108] Step S4, performing recovery processing on the digital signal in step S3, including:

[0109] Step S4-1, performing a digital down-conversion operation on the digital signal to obtain I and Q components of the digital down-conversion signal;

[0110] Step S4-2, resampling the down-converted signal;

[0111] Step S4-3, performing matching filtering on the resampled signal to obtain baseband digital signals of each branch;

[0112] Step S4-4, perform equalization, post-filtering and maximum likelihood sequence estimation on the baseband digital signals of each branch, and recover M i order QAM signal;

[0113] Step S4-4,...

Embodiment 3

[0138] Such as image 3 As shown, Embodiment 3 discloses a system for implementing the signal transmission method of Embodiment 1, which is used to send and receive optical modulation signals based on intensity modulation / direct detection optical communication systems; the multi-rate subcarrier modulation signal transmission system of this embodiment includes :

[0139] A multi-rate subcarrier modulation signal generation unit, which is used to design the number N of subcarriers and the center frequency f of each subcarrier according to the zero point information of the optical fiber dispersion channel i and bandwidth B i , avoiding the signal zero position, generating the multi-rate subcarrier modulation signal, where i=1, 2,...,N;

[0140] A digital-to-analog converter, configured to perform digital-to-analog conversion of the multi-rate subcarrier modulation signal;

[0141] An electro-optical modulator, configured to perform intensity modulation on the analog electrical...

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Abstract

The invention relates to a multi-rate subcarrier modulation signal receiving and transmitting method and system, and the method comprises the steps: carrying out the grouping and Mi-order mapping of a bit sequence according to the zero information of an optical fiber dispersion channel, so as to flexibly distribute the rate; carrying out the shaping filtering of each branch through a roll-off raised cosine filter, so as to eliminate a part of inter-symbol crosstalk; adjusting the bandwidth of each branch through resampling and rate adjustment of the formed filtering signal; realizing the frequency spectrum shifting through digital up-conversion of the resampled signal, and obtaining each subcarrier intermediate frequency signal with the center frequency being fi and the bandwidth being Bi and successfully avoiding the zero point position of each channel; and finally, adding the subcarrier signals to obtain a multi-rate subcarrier modulation signal. According to the sending method disclosed by the invention, the to-be-sent signal which can flexibly avoid the frequency spectrum zero point position of the optical fiber dispersion channel and has high dispersion tolerance can be generated while the rate is flexibly distributed.

Description

technical field [0001] The invention relates to optical communication technology, in particular to a method and system for receiving and transmitting optical communication data with multi-rate sub-carrier modulation with flexible rate allocation and high dispersion tolerance. Background technique [0002] In recent years, applications such as 4K / 8K HDTV, augmented reality / virtual reality, and edge cloud computing are driving the growth of global data traffic. In order to meet the increasing demand for capacity, the intensity modulation and direct detection system with the advantages of low cost, low power consumption and small size has always attracted the attention of the industry. However, C-band intensity modulation and direct detection systems with low transmission loss face the challenge of power fading caused by fiber dispersion. In the C-band intensity modulation and direct detection optical fiber communication system, the problem of zero-point damage of the signal s...

Claims

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Application Information

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IPC IPC(8): H04B10/2513H04B10/54H04B10/556H04B10/079
CPCH04B10/5563H04B10/54H04B10/2513H04B10/07953H04B10/07955Y02D30/50
Inventor 周骥王海德余长源
Owner JINAN UNIVERSITY
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