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Multi-carrier code division multiplexing light transmission system and method based on ultra dense wavelength division multiplexing

A technology of wavelength division multiplexing and transmission method, which is applied in the field of optical communication, and can solve problems such as limited radio frequency signals and short transmission distances

Inactive Publication Date: 2013-02-13
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, a 5.4Tb / s PDM-QPSK signal for Orthogonal Frequency Division Multiplexing has been generated by using a supercontinuum light source and optical frequency comb technology, but the transmission distance is very short due to the limitation of the optical signal-to-noise ratio of the supercontinuum ; At the same time, the cascaded phase modulation technology is used to generate a 1.2Tb / s PDM-RZ-QPSK DWDM optical signal, but limited by the RF signal on the phase modulator, only 12 subcarriers can be generated

Method used

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  • Multi-carrier code division multiplexing light transmission system and method based on ultra dense wavelength division multiplexing
  • Multi-carrier code division multiplexing light transmission system and method based on ultra dense wavelength division multiplexing
  • Multi-carrier code division multiplexing light transmission system and method based on ultra dense wavelength division multiplexing

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Embodiment 1

[0054] Such as figure 1 As shown, this embodiment provides a multi-carrier code division multiplexing optical transmission system based on ultra-dense wavelength division multiplexing, including a multi-carrier light source generation part, a modulation part, a multiplexing part, and a demultiplexing part connected in sequence , a demodulation part and a signal processing part, the multi-carrier light source generating part utilizes a single-frequency light source to generate a multi-carrier light source for transmission; the modulation part is used to modulate each branch electrical signal to the multi-carrier light source generating part generated on the corresponding optical carrier; the multiplexing part is used to multiplex the optical carriers modulated by the modulation part into a fiber channel; the demultiplexing part is used to separate the optical carriers in the signal transmitted by the optical fiber, respectively Perform signal recovery; the demodulation part is ...

Embodiment 2

[0068] The structure of this embodiment is the same as that of Embodiment 1 except for the following features: this embodiment is based on ultra-dense wavelength division multiplexing. multi-carrier methods such as Figure 7 As shown, the multi-carrier light source generation part is composed of a coupler, an I / Q modulator, a first erbium-doped fiber amplifier, a filter, a second erbium-doped fiber amplifier and a phase controller closed loop, and the input terminals of the coupler are respectively connected to the phase The controller is connected to the laser, and the output end is respectively connected to the I / Q modulator and the signal output end, and the I / Q modulator is driven by two radio frequency signals with the same amplitude and 90-degree phase difference.

[0069] In the optical transmission method based on the above-mentioned multi-carrier code division multiplexing optical transmission system based on ultra-dense wavelength division multiplexing, the method ba...

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Abstract

The invention discloses a multi-carrier code division multiplexing light transmission system and a multi-carrier code division multiplexing light transmission method based on ultra dense wavelength division multiplexing. The system comprises a multi-carrier light source generating part, a modulating part, a multiplexing part, a demultiplexing part, a demodulating part and a signal processing part which are sequentially connected. Firstly, a multi-carrier light source is generated by a single-frequency light source; then the modulating part modulates each branch electric signal onto a corresponding optical carrier; the multiplexing part is used for multiplexing each modulated optical carrier into an optical fiber channel; the demultiplexing part is used for separating each optical carrier in the signals to conduct signal recovery; the demodulating part is used for demodulating each branch signal; and the signal processing part is used for carrying out compensation on the demodulated signals. The method disclosed by the invention is fused with a code division multiplexing technology, a subcarrier modulating and demodulating technology, a wavelength division multiplexing and demultiplexing technology, a subcarrier demodulating technology based on coherent demodulation and the like. The multi-carrier code division multiplexing light transmission system and the multi-carrier code division multiplexing light transmission method based on ultra dense wavelength division multiplexing improve the message capacity of a network system and have the advantages of simpleness for capacity expansion, reliable performance and the like.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a multi-carrier code division multiplexing optical transmission system and method based on ultra-dense wavelength division multiplexing. Background technique [0002] In modern optical transmission systems, in order to meet the needs of high-capacity data transmission such as high-definition audio and video, the method of wavelength division multiplexing (WDM) has been widely used. Using this method can improve the spectrum utilization of the system and achieve more High data transfer rate. Wavelength division multiplexing refers to the transmission of multiple optical signals with different carrier frequencies on the same optical transmission channel, and each optical carrier can be regarded as an independent transmission channel. In practical applications, in order to increase the transmission capacity, the number of carriers for wavelength division multiplexing continues ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/02H04L27/26H04B10/61H04B10/556
Inventor 郭昌建黄凌晨戴龙玲
Owner SOUTH CHINA NORMAL UNIVERSITY
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