D-shaped fiber-based cross-polarization beat laser and sensor

An orthogonal polarization and laser technology, applied in the laser field, can solve the problems of high cost, complex fabrication, and low birefringence of polarization-maintaining erbium-doped fibers, and achieve high integration, shortened cavity length, and good laser coherence

Inactive Publication Date: 2017-01-25
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, due to the low birefringence of ordinary optical fibers, the cost of polarizat

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  • D-shaped fiber-based cross-polarization beat laser and sensor
  • D-shaped fiber-based cross-polarization beat laser and sensor

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[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0029] It should be noted that like numerals and let...

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Abstract

The invention provides a D-shaped fiber-based cross-polarization beat laser and a sensor. The laser comprises a pump laser, a wavelength division multiplexer connected with the pump laser, a first fiber Bragg grating, one end of which is connected with the wavelength division multiplexer, a second fiber Bragg grating, one end of which is connected with an output fiber, and an erbium-doped D-shaped fiber which is encapsulated between the other end of the first fiber Bragg grating and the other end of the second fiber Bragg grating, wherein the first fiber Bragg grating, the second fiber Bragg grating and the erbium-doped D-shaped fiber are integrated on one fiber. The distributed fiber grating is adopted as a reflector to form an ultrashort resonant cavity, and the cavity length can be effectively shortened, so that the laser can run in a single-longitudinal-mode state, and the generated laser has good coherence. The D-shaped fiber is used as the body of the resonant cavity, the constraining performance of the resonant cavity on light can be reduced, and part of the transmitted light is leaked from one side to form an evanescent field which is sensitive to external environment changes, so that induction of a specific parameter can be realized.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to an orthogonally polarized beat-frequency laser and a sensor based on a D-type optical fiber. Background technique [0002] Fiber laser (Fiber Laser) refers to a laser that uses a rare earth-doped glass fiber as a gain medium. Fiber lasers can be developed on the basis of fiber amplifiers: under the action of pump light, high power density is easily formed in the fiber, resulting in laser The laser energy level of the working substance is "particle number inversion", and when properly added to the positive feedback loop (to form a resonant cavity), the laser oscillation output can be formed. [0003] As a laser light source with broad application prospects, fiber laser has the advantages of broadband tunability, high signal-to-noise ratio, and narrow output laser linewidth. It can be widely used in optical fiber sensing, optical fiber communication, optical processing, etc. field....

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Application Information

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IPC IPC(8): H01S3/067
CPCH01S3/0675H01S3/067H01S3/06716
Inventor 邵理阳钱恒梁家伟闫连山潘炜罗斌
Owner SOUTHWEST JIAOTONG UNIV
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