Free space optical receiving system based on few-mode multi-core optical fiber

A multi-core fiber, free space technology, applied in the field of free space optical receiving systems, can solve problems such as blanks, achieve the requirements of reducing aiming and tracking accuracy, increase coupling efficiency, and reduce bit error rate.

Inactive Publication Date: 2019-04-09
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

Few-mode multicore fiber (R.G.H.van Uden, R.A.Correa, E.A.Lopez, F.M.Huijskens, C.Xia, G. Li, et al.,"Ultra-high-density spatial division multiplexing with a few-mode multicore fi

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  • Free space optical receiving system based on few-mode multi-core optical fiber
  • Free space optical receiving system based on few-mode multi-core optical fiber
  • Free space optical receiving system based on few-mode multi-core optical fiber

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[0021] The present invention will be further described in detail below with reference to the drawings and embodiments, but the protection scope of the present invention should not be limited by this.

[0022] figure 1 It is a schematic structural diagram of a free space optical receiving system based on a few-mode multi-core fiber according to the present invention. It can be seen from the figure that the free-space optical receiving system based on the few-mode multi-core fiber of the present invention includes a receiving antenna 1, a few-mode multi-core fiber 2, a mode demultiplexer 3, a detector 4, and a receiver 5; After the space atmosphere is turbulent, the free-space light is optically coupled through the receiving antenna 1, and then received by the few-mode multi-core optical fiber 2, and then the received signal is transmitted through the mode demultiplexer 3 The light is converted into a multi-channel single-mode signal, and the optical signal is converted into an ele...

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Abstract

The invention discloses a free space optical receiving system based on a few-mode multi-core optical fiber. The receiving system is characterized by comprising a receiving antenna, a few-mode multi-core optical fiber, a mode demultiplexer, a detector and a receiver. The invention aims to further develop a free space optical receiving system, and provides the free space optical receiving system based on the few-mode multi-core optical fiber. The system is characterized in that the characteristic of high tolerance of the few-mode multi-core optical fiber is fully utilized when the received lightbeams are not aligned. According to the invention, the coupling efficiency of free space light can be improved, and the influence caused by atmospheric turbulence disturbance is reduced, so that thebit error rate during signal demodulation is reduced. In addition, the requirement on the aiming tracking precision of the received light beam can be reduced, and the method has very important significance for free space optical receiving systems such as long-distance free space optical communication and laser radar.

Description

technical field [0001] The invention relates to a free-space optical receiving system, in particular to a free-space optical receiving system based on few-mode multi-core optical fibers. Background technique [0002] The free space optical receiving system is a means of coupling the light arriving at the receiving system into the receiver. At present, due to the development of optical fiber receivers, optical fiber reception has become a mainstream method. Among them, the single-mode fiber core diameter is too small, and the coupling efficiency is too low under the condition of atmospheric turbulence. Since multimode optical fibers receive hundreds of modes at the same time, subsequent processing is difficult. Recently, the reception method of few-mode fiber has attracted attention. [0003] Prior art [1] (D.H.Zheng, Y.Li, E.H.Chen, B.B.Li, D.M.Kong, W.Li, et al., "Free-space to few-mode-fiber coupling under atmospheric turbulence," OpticsExpress, vol .25, pp.18739-18755...

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Application Information

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IPC IPC(8): H04B10/61H04B10/11H04B10/2581H04J14/04
CPCH04B10/11H04B10/2581H04B10/61H04B10/615H04J14/04
Inventor 张波孙建锋贺红雨
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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