Brillouin-Erbium-doped Fiber Random Lasers with Switchable Wavelength Spacing

Abstract

The invention discloses a Brillouin-Er-doped fiber random fiber laser with switchable wavelength intervals. The laser is of a semi-open cavity structure and comprises an open loop part and a straightline part. In the open loop part, one end of a circulator is connected with the output end of a coupler, the other end of the circulator is connected with the input port of the coupler, the other input end of the coupler is connected with the output end of a Brillouin pumping source, and the other output end of the coupler is connected with the input end of a spectrograph. The linear part comprises two connected linear units, and each linear unit comprises a pumping source, a wavelength division multiplexer, an Er-doped fiber and a single-mode fiber; the output end of the pumping source is connected with the input end of the wavelength division multiplexer, and the output end of the wavelength division multiplexer is connected with the Er-doped optical fiber; the other side of the Er-dopedoptical fiber is connected with one end of the single-mode optical fiber, and the other end of the single-mode optical fiber is connected with the second linear unit wavelength division multiplexer;and the single-mode optical fiber of the second linear unit is connected with the isolator. According to the invention, the Brillouin Stokes light output with switchable wavelength intervals is realized by the adjustment of the on / off and power of the pumping source.

Description

technical field [0001] The invention relates to a random laser, in particular to a Brillouin-erbium-doped fiber random laser with switchable wavelength interval. Background technique [0002] The concept of random laser was first proposed by Ambartsumyan et al. in 1966. Compared with traditional lasers, random lasers do not have a fixed optical resonator, and their optical feedback is realized by the multiple scattering effect in the disordered medium. The interference effect of scattered light is used to generate a resonance mode of a specific frequency to achieve random laser output. The potential applications of random lasers in fiber optic sensing, physical optics imaging, spectrometry, microwave photonics, and biomedicine have attracted considerable interest in recent decades. [0003] The random laser has no fixed optical resonant cavity. The working principle is that the light is scattered multiple times in the disordered medium to realize the feedback. The interfere...

AI Technical Summary

Problems solved by technology

[0007] Purpose of the invention: the purpose of the present invention is to provide a switchable wavelength interval Brillouin-erbium-doped fiber random laser, to solve the weak Brillouin signal optical feedback in the random fiber laser, the Brillouin order that can be produced by cascading few problems, and can achieve wavelength interval switchable output

Images