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Spatial multiplexing-based non-local oscillation coherent receiving optical fiber communication system

A technology for spatial multiplexing and communication systems, applied in the field of non-local oscillator coherent receiving optical fiber communication systems, can solve the problems of limiting all-optical non-relay transmission distance and practical network applications, and achieve the effect of reducing complexity

Active Publication Date: 2013-01-16
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

As the rate of optical fiber communication systems is upgraded from 10G to 40G, and even 100G, factors such as dispersion, polarization mode dispersion, nonlinear effects, and phase noise in optical fiber links greatly limit the transmission distance and practical network applications of all-optical non-relay

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  • Spatial multiplexing-based non-local oscillation coherent receiving optical fiber communication system

Examples

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Embodiment 1

[0018] see figure 1 , a non-LO coherent receiving optical fiber communication system based on spatial multiplexing provided in this embodiment includes: a light source input unit (including a multi-wavelength laser array, a first arrayed waveguide grating and a coupler), an optical signal modulation unit (including PBS, first MZM modulation module, second MZM modulation module, PBC and EDFA), spatial multiplexing and demultiplexing unit (including spatial multiplexer, spatial demultiplexer and multi-core optical fiber 1), optical signal conversion unit (including the second array waveguide grating, optical mixer, balance detector and analog-to-digital converter) and electrical signal processing unit (using DSP chip). Different cores in a multi-core fiber have different refractive indices. The multi-core optical fiber 1 in this embodiment adopts a seven-core optical fiber. The multi-wavelength laser array is connected with the coupler through the first arrayed waveguide grati...

Embodiment 2

[0021] see figure 2 , a non-local oscillator coherent receiving optical fiber communication system based on spatial multiplexing provided by an embodiment of the present application, including: a light source input unit (using a single-wavelength laser), an optical signal modulation unit (including a PBS, a first MZM modulator, a second Two MZM modulator, PBC and EDFA), spatial multiplexing and demultiplexing unit (including spatial multiplexer, spatial demultiplexer and multi-core fiber 1), optical signal conversion unit (including optical mixer, balance detector device and analog-to-digital converter) and electrical signal processing unit (using DSP chip). Different cores in a multi-core optical fiber have different refractive indices, and the multi-core optical fiber 1 in this embodiment adopts a seven-core optical fiber. The single-wavelength laser is sequentially connected to the spatial multiplexer through the PBS, the first MZM modulator, the PBC, and the EDFA (connec...

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Abstract

The invention relates to the technical field of optical fiber communication, in particular to a spatial multiplexing-based non-local oscillation coherent receiving optical fiber communication system. The spatial multiplexing-based non-local oscillation coherent receiving optical fiber communication system comprises a light source input unit, a light signal modulation unit, a spatial multiplexing and demultiplexing unit, a light signal conversion unit and an electric signal processing unit; the light source input unit is connected with the spatial multiplexing and demultiplexing unit through the light signal modulation unit; the light source input unit is also connected with the spatial multiplexing and demultiplexing unit; and the spatial multiplexing and demultiplexing unit is connected with the electric signal processing unit through the light signal conversion unit. By the spatial multiplexing-based non-local oscillation coherent receiving optical fiber communication system provided by the invention, an expensive narrow-linewidth adjustable local oscillation light source at a receiving end is eliminated, and the complexity degrees of the frequency estimation and the phase retrieval algorithm of the receiving end are reduced.

Description

technical field [0001] The present application relates to the technical field of optical fiber communication, in particular to a non-local oscillator coherent receiving optical fiber communication system based on spatial multiplexing. Background technique [0002] In the 1970s, with the successful research of low-loss optical fibers and semiconductor lasers operating at room temperature, a wave of optical fiber communication development was set off worldwide. Over the past few decades, the optical fiber has developed from multimode to single-mode, and the working wavelength has developed from short wavelength (850nm) to long wavelength (1310nm and 1550nm). The invention of EDFA (that is, Erbium-doped Fiber Amplifier) ​​avoids the regeneration of photoelectric and optical relays, and prolongs the transmission distance of all-optical relays. DWDM (that is, Dense Wavelength Division Multiplexing) technology improves the transmission capacity of communication systems based on si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/61
Inventor 付松年李博睿
Owner HUAZHONG UNIV OF SCI & TECH
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