Tunable single-polarization Brillouin erbium-doped optical fiber laser with super narrow linewidth

Abstract

A tunable single-polarization Brillouin erbium-doped optical fiber laser device with super narrow linewidth comprises a narrow linewidth pump laser, a three-port circulator, a wavelength division multiplexer, a section of erbium-doped optical fiber wound on a piezoelectric ceramic ring, an erbium-doped optical fiber pump light source and a narrow-band optical filter and an optical fiber coupler with a coupling mode of 2*2 or 1*2. The narrow linewidth pump laser is connected to a first port of the circulator through an optical fiber, a second port of the circulator is connected with a reflecting port of the wavelength division multiplexer through an optical fiber, the erbium-doped optical fiber pump light source is connected with a passband port of the wavelength division multiplexer through an optical fiber, a common port of the wavelength division multiplexer is connected with the erbium-doped optical fiber and then connected to a third port of the optical fiber coupler, a third port of the circulator is connected to a first port of the optical fiber coupler through the narrow linewidth pump laser, and a fourth port of the optical fiber coupler outputs laser. The tunable single-polarization Brillouin erbium-doped optical fiber laser device with the super narrow linewidth achieves output of tunable single-polarization Brillouin erbium-doped optical fiber laser with the super narrow linewidth.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a tunable single polarization ultra-narrow line width 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. There are two main types of ultra-narrow linewidth fiber lasers: rare earth-doped fiber lasers and Brillouin fiber lasers (BFL). [0003] The method to achieve narrow linewidth rare earth doped fiber laser is to compress the cavity length, such as the patent "Single Frequency Single Polarization Linear Cavity Ytterbium Doped Laser" (Patent Publication No. CN 101355226A). This patent uses ytterbium-doped fiber as the gain medium, and the length of the linear cavity is only 5cm....

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Problems solved by technology

However, this method uses a polarization-maintaining fiber grating, an unpumped erbium-doped fiber, and a polarization modulator to form a wavelength tuner, resulting in a complex laser structure and unchanged adjustment control.

Moreover, the saturated absorber increases the cavity loss, and the fiber grating is prone to temperature drift, which in turn leads to the instability of the laser

There is no report on tunable single-polarization ultra-narrow linewidth BEFL

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