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Self-correlation zero-difference detection apparatus and method based on mode multiplexing optical communication system

A technology for a communication system and a detection device, applied in the field of optical communication systems, can solve the problems of sacrificing the spectral efficiency of the system and reducing the spectral efficiency of the system, and achieve the effect of simple system structure, reduced complexity, and small demand for the number of lasers

Active Publication Date: 2016-05-25
WUHAN POST & TELECOMM RES INST CO LTD
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Problems solved by technology

However, the existing autocorrelation homodyne detection is not ideal due to the use of pilot remote transmission methods with different wavelengths, polarization states, and different fiber cores, which greatly reduces the spectral efficiency of the system and sacrifices the spectral efficiency of the system. s solution

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  • Self-correlation zero-difference detection apparatus and method based on mode multiplexing optical communication system
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  • Self-correlation zero-difference detection apparatus and method based on mode multiplexing optical communication system

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0023] see figure 1 As shown, the embodiment of the present invention provides an autocorrelation homodyne detection device based on a mode multiplexing optical communication system, which includes a sending end and a receiving end, and the sending end and the receiving end are connected by an optical fiber link.

[0024] Wherein, the transmitting end includes an initial light source generator, a first multi-carrier optical generating device, a first demultiplexer, a mode multiplexer, a first multiplexer, and N sending modules, where N is a positive integer greater than 1, and the The initial light source generator, the first multi-carrier light generating device, the first wave splitter, and the mode multiplexer are connected in sequence, and the first wave splitter is also connected to N sending modules respectively, and the N sending module...

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Abstract

The invention discloses a self-correlation zero-difference detection apparatus and method based on a mode multiplexing optical communication system, and relates to the field of the optical communication system. The detection method comprises the steps of dividing one path of light source in N frequency point light sources obtained by carrying out wave division on N related wavelength light sources into two paths, using one path of light source as a reference light source, inputting the reference light source into an a mode of a mode multiplexer, after modulating and compounding the other path of light source and the rest of frequency point light sources, inputting an obtained light source into to a b mode of the mode multiplexer, and after mode multiplexing, sending the obtained light source to a receiving end; and after carrying out mode demultiplexing by the receiving end, using the frequency point light source corresponding to a signal in the a mode as local oscillator light, using the frequency point light source corresponding to a signal in the b mode as signal light, inputting the local oscillator light and the signal light into integrated coherent receivers to carry out photovoltaic conversion, and after sampling by four-path ADCs (Analog-Digital Converters), completing signal recovery by DSPs (Digital Signal Processors). According to the self-correlation zero-difference detection apparatus and method disclosed by the invention, the problems of frequency deviation and phase noise are solved, and a corresponding optical communication system is simple in structure; complexity of a digital signal processing algorithm is reduced; and spectral efficiency of the system is ensured.

Description

technical field [0001] The invention relates to the technical field of optical communication systems, in particular to an autocorrelation homodyne detection device and method based on a mode multiplexing optical communication system. Background technique [0002] Digital coherent detection technology can realize all-optical amplitude modulation, phase and polarization state management, and can use electronic signal processing to realize optical fiber link loss compensation in the electrical domain. In addition to its recognized advantages of high sensitivity, digital coherent detection technology has become a It is a receiving method commonly used in commercial optical communication systems at present. In digital coherent detection, the frequency stability between the local oscillator light and the received optical signal is very important. If the frequency (or wavelength) of the laser drifts with different working conditions, the difference between the local oscillator ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00
CPCH04L7/0066H04L7/007
Inventor 贺志学李响杨奇
Owner WUHAN POST & TELECOMM RES INST CO LTD
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