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System and method for simultaneously transmitting multiple signals by using mode division multiplexing of multimode optical fiber

A multi-mode optical fiber and mode division multiplexing technology, which is applied in the direction of optical mode multiplexing system, multi-mode transmission, optical fiber transmission, etc., can solve the problems that the application of mode division multiplexing has not been reported, and achieve low cost, easy connection, The effect of low device cost

Inactive Publication Date: 2013-02-06
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] At present, most of the signals transmitted by optical fibers are wavelength division multiplexing and frequency division multiplexing, but there are no reports on the application of mode division multiplexing.

Method used

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  • System and method for simultaneously transmitting multiple signals by using mode division multiplexing of multimode optical fiber

Examples

Experimental program
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Embodiment 1

[0029] Embodiment 1 of the present invention such as figure 1 As shown, a system that utilizes mode division multiplexing of multimode fiber to simultaneously transmit multiple signals includes a solid-state laser 1, a fiber collimator 2, single-mode fibers 3 and 8, an optical modulator 4, and a fiber coupler A ( 5), B(7), multimode fiber 6, optical demodulator 9, characterized in that the solid-state laser 1 is located in front of multiple fiber collimators 2, each fiber collimator 2 is fixed by a bracket, each A single-mode optical fiber 3 is connected behind the fiber collimator 2, and an optical modulator 4 is connected behind each single-mode optical fiber 3, and each optical modulator 4 is connected to a fiber coupler A (5) by a single-mode optical fiber, and the optical fiber A multimode fiber 6 is connected behind the coupler A (5), and multiple single-mode fibers and multimode fibers 6 are coupled and connected by the fiber coupler A (5); the other end of the multimod...

Embodiment 2

[0032] 1) Connect the mode division multiplexing system, turn on the power of the solid-state laser, and place the optical power meter at the exit of the solid-state laser to check whether the solid-state laser is working normally. If there is an optical power display, it means that the solid-state laser is working normally;

[0033] 2) Place the scanning interferometer between the optical power meter and the solid-state laser, use the scanning interferometer to measure the laser mode spectrum of the laser emitted by the solid-state laser, and then use the optical power meter to detect it on a plane perpendicular to the axis of the solid-state laser The energy of different modes of laser light and their positions in space; adjust the brackets of each fiber collimator so that each fiber collimator is located at the spatial position of each different mode of laser light, so that the received Lasers of different modes are input into different single-mode fibers connected with each...

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Abstract

The invention relates to a system and method for simultaneously transmitting multiple signals by using mode division multiplexing of multimode optical fiber, belonging to an optical fiber communication technology. The system comprises a solid laser, an optical fiber collimator and the like. Light beams emitted from the solid laser contain multiple transverse modes, and high-level modes and low-level modes are in different spatial positions, therefore different modes of laser can be separated and are respectively received by the optical fiber collimator and led out by single mode optical fiber, different signals are modulated to different modes of light, modulated optical signals are then coupled to one multimode optical fiber to be transmitted to a receiving end, and then different modes of light are separated by using an optical fiber coupler and are respectively demodulated to further obtain different signals. The signal and method disclosed by the invention has the characteristics that multiple channels are transmitted by taking different modes as mutually independent channels, so that the transmission capability of the multimode optical fiber is greatly improved. The multimode optical fiber used in the system and method has the advantages of large numerical aperture, easy connection, lower cost of matched devices, large bearing capacity and the like and is suitable for short-distance optical fiber communication.

Description

technical field [0001] The present invention relates to a system and method for simultaneously transmitting multiple signals by means of mode division multiplexing of multimode optical fibers, specifically, a system and method for using different modes of light to load different signals and using multimode optical fibers for transmission. Background technique [0002] According to the number of transmission modes in the optical fiber, the optical fiber is divided into single-mode optical fiber and multi-mode optical fiber. Single-mode fiber can only transmit one mode, while multimode fiber allows different modes of light to be transmitted on the same fiber. [0003] Although single-mode fiber is cheaper and has better performance than multimode fiber, fiber optic networks still use multimode fiber because the characteristics of multimode fiber just meet the requirements of network fiber. Compared with long-distance trunk lines, the characteristics of optical fiber networks ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/2581H04J14/04
Inventor 常军高婷王宗良朱存光李晨王强刘永宁
Owner SHANDONG UNIV