Low insertion loss three-loop narrow linewidth Brillouin fiber laser

A fiber laser and laser technology, used in lasers, laser parts, phonon exciters, etc., can solve the problems of increasing the loop loss, optimization, and increasing loss of the resonator cavity, reducing system cost, optimizing threshold and line width. , the effect of lowering the threshold

Active Publication Date: 2017-10-10
TAIYUAN UNIV OF TECH
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Problems solved by technology

Researchers such as Yong used an asymmetric Mach-Zehnder interference structure to obtain a single longitudinal mode output with a linewidth of less than 1kHz (J. Lightw. Technol.,vol. 21, no. 2, pp. 546–554, Feb. 2003) , through the asymmetric Mach-Zehnder interference to filter out the pump light and the Brillouin laser respectively, because there is only the Brillouin laser in the resonator, so the cavity loss can be effectively reduced, although this structure is simple and uses a commercial DFB Laser, but this structure also needs a high-precision (0.01 ℃) constant temperature box to ensure its filtering characteristics; researchers such as Shen used a Fab cavity composed of a Bragg grating to realize an 11GHz microwave signal (J.Lightwave Technol. 23, 1860 -1865,2005.), but it is necessary to precisely adjust the reflectivity of the FBG to obtain a narrow linewidth output, which virtually increases the loss of the resonator loop; researchers such as Geng used PDH (Pound-Drever-Hall) Stabilized system (IEEE Photon. Technol. Lett. vol. 18, no. 17, pp. 1813–1815, Sep. 1, 2006.), achieving a theoretical linewidth value of 75Hz, but this configuration is complex and costly
The above-mentioned experimental devices have a common problem, that is, the ring length of the resonator is in the range of 10m~20m, which will limit the further optimization of the linewidth and threshold of the Brillouin fiber laser
[0004] In view of the limitation of ring length, researchers such as Chen extended the resonant cavity length to 500m high nonlinear optical fiber as a medium to provide Brillouin gain (Appl. Phys. B, vol. 107, no. 3, pp . 791–794,2012.), with an adaptive ultra-narrow band-pass filter, to achieve a single longitudinal mode laser output, but did not measure its true line width value, and the adaptive ultra-narrow band-pass filter The pump light power needs to be precisely controlled, which increases the cavity loss and cannot achieve the effect of optimizing the laser threshold. At the same time, the 500m high nonlinear fiber is also very expensive

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  • Low insertion loss three-loop narrow linewidth Brillouin fiber laser

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Embodiment Construction

[0027] The specific implementation manners of the present invention will be further described below.

[0028] as attached figure 1 - attached Figure 6 Described, implement a kind of low insertion loss three-loop narrow-linewidth Brillouin fiber laser provided above of the present invention, this sensor comprises narrow-linewidth single-frequency laser 1; Erbium-doped fiber amplifier 2; First polarization controller 3 ; Optical circulator 4; The first single-mode optical fiber 5; The second single-mode optical fiber 6; Unpumped erbium-doped optical fiber 7; The first optical splitter 8a; The second optical splitter 8b; The third optical splitter 8c; the fourth optical splitter 8d; the fifth optical splitter 9; line width measurement system a; second polarization controller 10; photoelectric modulator 11; signal generator 12; Detector 14 and Spectrum Analyzer 15.

[0029]Based on the above-mentioned constituent requirements, the constitutional relationship of the present inv...

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Abstract

The invention discloses a Brillouin three-loop narrow-linewidth fiber laser with low insertion loss. The Brillouin gain effect of an optical fiber, the Brillouin narrowing effect and the wiener effect are applied to the Brillouin fiber laser. The Brillouin fiber laser comprises a narrow-linewidth single-frequency continuous laser, an erbium-doped optical fiber amplifier, a polarization controller, an optical circulator, an optical divider, a single-mode optical fiber, an unpumped erbium-doped optical fiber, a photoelectric modulator, a signal generator, a photoelectric detector and a spectrum analyzer. The laser is characterized in that the proper length of the three-loop optical fiber with low insertion loss is selected, thresholds and line width characteristics of the Brillouin fiber laser can be optimized, the system cost is effectively reduced, and the laser is measured by a line width testing system, so that the Brillouin single-longitudinal-mode laser with the threshold of 26mW and the line width less than 300Hz is obtained.

Description

technical field [0001] The present invention relates to a kind of optical fiber laser, especially a kind of narrow line width single-frequency continuous laser, erbium-doped fiber amplifier, polarization controller, optical circulator, optical splitter, single-mode optical fiber, unpumped erbium-doped optical fiber A three-loop low-threshold narrow-linewidth Brillouin fiber laser with an optoelectronic modulator, signal generator, photodetector, and spectrum analyzer. Background technique [0002] Because stimulated Brillouin scattering has the characteristics of narrow bandwidth and low noise, it is widely used in distributed optical fiber sensing, narrowband low noise amplifier, narrow linewidth fiber laser and microwave photon generator, etc., especially, from 1976 Hill et al. After the researchers (Appl. Phys. Lett. 1976, 28(10): 608-609.) proposed the Brillouin fiber laser for the first time, due to the advantages of the narrow linewidth, low threshold and low cost of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/098H01S3/094H01S3/30
Inventor 刘毅张明江李岚
Owner TAIYUAN UNIV OF TECH
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