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A dual-frequency dfb fiber laser

A fiber laser and dual-frequency laser technology, applied in the structure/shape of the active medium, can solve problems such as difficult to meet requirements, small frequency interval between double peaks, complex structure, etc., and achieve the effect of compact structure and low cost

Inactive Publication Date: 2011-11-30
FOSHAN UNIVERSITY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] To sum up, the current long-cavity dual-frequency fiber lasers have disadvantages such as poor stability and complex structure, while short-cavity dual-frequency DFB fiber lasers almost all use phase-shifting gratings or sampling gratings, and there are difficulties in engraving double-peak filters. , The double-peak frequency interval is small, the engraving accuracy, consistency and stability are difficult to meet the requirements and other shortcomings

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  • A dual-frequency dfb fiber laser
  • A dual-frequency dfb fiber laser
  • A dual-frequency dfb fiber laser

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Embodiment Construction

[0017] Now in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

[0018] As shown in the figure, the present invention includes an active optical fiber 4, a signal / pumping wavelength division multiplexer 2, and a pump laser 3. On the active optical fiber 4, a uniform fiber grating 1 and a port 1 of the uniform fiber grating 1 are engraved. -1 is connected to one port 2-1 of the signal / pump wavelength division multiplexer 2, and the pump laser 3 is connected to another port 2-2 of the signal / pump wavelength division multiplexer 2 through an optical fiber, and the signal / pump wavelength division multiplexer 2 is connected to each other. The laser output terminals 2-3 of the pump wavelength division multiplexer are dual-frequency laser output terminals.

[0019] The active fiber 4 is an erbium / ytterbium co-doped fiber, and the length of the active fiber is 2-8 centimeters.

[0020] The signal / pump wavelength ...

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Abstract

A dual-frequency DFB fiber laser is characterized in that it comprises an active optical fiber, a signal / pumping wavelength division multiplexer, and a pumping laser, and is engraved with a uniform fiber grating on the active fiber, and the port of the uniform fiber grating is connected to the signal / pumping laser. One port of the pump wavelength division multiplexer is connected, and the pump laser is connected to the other port of the signal / pump wavelength division multiplexer through an optical fiber. The laser output port of the signal / pump wavelength division multiplexer is dual-frequency Laser output. Compared with the prior art, the invention has the advantages of large frequency difference of the dual-frequency laser, low manufacturing cost and high stability in use.

Description

technical field [0001] The invention belongs to the field of optical fiber lasers, in particular to a dual-frequency optical fiber laser that generates millimeter waves with optical beats. It is mainly used in radio over fiber (ROF, radio over fiber) technology, band mobile communication, network wireless access, intelligent transportation and satellite communication, optical fiber sensing technology and other fields. Background technique [0002] Dual-frequency fiber lasers have important applications in the fields of optical sensing, interferometry, wavelength division multiplexing optical communication, and optical beat generation of millimeter waves. Since the two laser modes output by the dual-frequency laser come from the same resonator and gain medium, their frequency difference and phase difference are stable, so the coherence and stability are good. [0003] Compared with dual-frequency semiconductor lasers (linewidth of the order of MHz), dual-frequency fiber las...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067
Inventor 陈国杰黄德修
Owner FOSHAN UNIVERSITY