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Two-wave transmission system based on recessive conjugate

A transmission system and conjugate technology, applied in the field of nonlinear optical signal transmission and processing, can solve the problems of reduced transmission capacity, decreased spectrum utilization rate, and low effective transmission efficiency, and achieve simplified transmitter structure, good scalability, and suppression The effect of first-order nonlinear effects

Active Publication Date: 2017-11-03
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Application Information

AI Technical Summary

Problems solved by technology

However, because this technology needs to construct phase-conjugated dual wavelets, the transmission of conjugated signals will reduce the spectrum utilization by half and reduce the transmission capacity by half. bottleneck

Method used

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  • Two-wave transmission system based on recessive conjugate
  • Two-wave transmission system based on recessive conjugate
  • Two-wave transmission system based on recessive conjugate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0023] by figure 2 The transmission of a dual polarization state 4psk modulation signal is taken as an example to describe in detail.

[0024] The transmitting end divides the optical carrier generated by the laser into two orthogonal paths through the polarization beam splitter. After the bit stream is modulated and mapped, two channels of modulation signals are generated. The light of the two polarization directions is respectively input to the optical phase modulator, and the modulation sequence of the 4PSK system is adopted, and one channel is input to the optical fiber through the polarization combination plate.

[0025] The dual-polarized signal light is transmitted through the optical fiber, and the receiver adopts polarization multiplexing coherent receiving technology to separate and obtain two polarization signals of X and Y, and uses dispersion compensation, clock recovery, frequency offset compensation, polarization demultiplexing, phase noise compensation and Tr...

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Abstract

The invention provides a two-wave transmission system based on recessive conjugate. The system almost does not change a hardware structure and a digital signal processing process of the common optical transmitter; the generation and the transmission of two conjugate waves according to the conventional scheme are no longer needed; only at least two paths of paired and separable independent signals are required and meet orthogonality conditions each other; the orthogonality conditions include polarization multiplexing orthogonal channels or a plurality of multi-carrier modulation (OFDM) subcarriers or different channels utilizing a wavelength division multiplexing technology and different time slices of time division multiplexing, namely parallel transmission of at least two paths, the generalized orthogonality is met, and the orthogonality requirements, such as polarization multiplexing, time division multiplexing, frequency division multiplexing or mode division multiplexing, can be met in any dimension. One or more corresponding orthogonal channels are determined for each independent signal in an optical receiver, and the two conjugate waves are recovered on the channels, and then the coherent superposition of the two conjugate waves is carried out to eliminate a first-order fiber nonlinear effect.

Description

technical field [0001] The technology of the present invention relates to nonlinear optical signal transmission and processing technology. Background technique [0002] In the past two decades, the transmission capacity of optical fiber communication systems has experienced a huge increase of three orders of magnitude. In the current high-speed optical fiber communication system, with the completion of the commercial layout of the 100Gb / s system, the single channel of next-generation optical fiber transmission begins to develop to 400Gb / s or even 1Tb / s, and the total capacity of a single optical fiber develops to 100Tb / s to meet the rapidly increasing data traffic. growing demand. From the perspective of the development of existing long-distance optical fiber transmission technology, transmission capacity and transmission distance are mutually restricted, and there are theoretical limitations in ensuring sufficient transmission distance while improving transmission capacity...

Claims

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Application Information

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IPC IPC(8): H04B10/2543H04B10/61H04J14/06
CPCH04B10/2543H04B10/616H04B10/6162H04B10/6163H04J14/06
Inventor 易兴文黄夏涛宋阳朱明月张静邱昆
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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