Brillouin erbium (Er)-doped fiber laser (BEDFL) with single-frequency ultra-narrow line width

A technology of erbium-doped fiber and laser, applied in the structure/shape of active medium, active medium material, etc., can solve the problems of small Brillouin gain and inability to form stable BEFL laser output, and achieve improved Brillouin gain and structure Compact and reduce cavity loss

Active Publication Date: 2012-02-22
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, the Brillouin gain in the short fiber is small, and it is easy to excite the erbium-doped f

Method used

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  • Brillouin erbium (Er)-doped fiber laser (BEDFL) with single-frequency ultra-narrow line width
  • Brillouin erbium (Er)-doped fiber laser (BEDFL) with single-frequency ultra-narrow line width
  • Brillouin erbium (Er)-doped fiber laser (BEDFL) with single-frequency ultra-narrow line width

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[0021] See figure 1 The invention consists of a narrow linewidth pump laser 1, a three-port circulator 2, an erbium-doped fiber amplifier 3 capable of bidirectional amplification, a single-mode fiber 4, a narrowband optical filter 5, and a 2×2 fiber coupling 器6 consists of. The output light of the narrow linewidth pump laser 1 is injected into the first port 21 of the circulator 2, and then injected into the erbium-doped fiber amplifier 3 through the second port 22 of the circulator, and then amplified and injected into the single-mode fiber 4 as Brillouin pump light , The backscattered light excited in the single-mode fiber 4 includes the Rayleigh scattered light with the same frequency as the Brillouin pump light, and the anti-Stokes light with the frequency shifted up in the frequency shifted Brillouin scattered light and the frequency lower Stokes light moving. After being amplified by the erbium-doped fiber amplifier 3, the backscattered light is input to the third port 23...

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Abstract

The invention discloses a Brillouin erbium (Er)-doped fiber laser (BEDFL) with single-frequency ultra-narrow line width and aims to realize stable single-frequency Brillouin laser output in an annular cavity of the BEDFL. The BEDFL consists of a pump laser with narrow line width, a circulator, an Er-doped fiber amplifier (EDFA) capable of realizing bidirectional amplification, a section of singlemode fiber (SMF), a narrow-band optical filter and a fiber coupler. In the invention, the EDFL capable of realizing bidirectional amplification is placed in front of the SMF, Brillouin pump light is pre-amplified firstly and then injected into the SMF so as to improve the Brillouin pump power and further realize higher Brillouin gain in a shorter optical fiber; in addition, the EDFA also can be used for amplifying backscattered light so as to compensate cavity loss of the laser and realize higher-power Brillouin laser output. Therefore, the invention has the beneficial effects of solving the conflict between the short SMF and high Brillouin gain and realizing stable single-frequency BEDFL output and develops a novel hybrid gain type EDFL with ultra-narrow line width.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a single-frequency ultra-narrow linewidth Brillouin-doped erbium fiber laser. Background technique [0002] Ultra-narrow linewidth fiber lasers have become an important development direction of fiber lasers due to their unique low phase noise characteristics. They are widely used in distributed fiber optic sensing and interferometric fiber optic sensing systems to reduce noise and improve detection sensitivity. According to different gain media, ultra-narrow linewidth fiber lasers are mainly divided into stimulated scattering fiber lasers and doped fiber lasers. The Brillouin fiber laser (BFL) uses the nonlinear Brillouin gain in the fiber, and the linewidth can reach below kHz or even sub-Hz level. important applications in communication systems. But the Brillouin gain coefficient of ordinary single-mode fiber is small (~10 -11 m / W), it is necessary to precisely control the length of the reso...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/16
Inventor 周会娟姚琼陈伟胡正良宋章启徐攀张学亮倪明陈默
Owner NAT UNIV OF DEFENSE TECH
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