Self-excited multi-wavelength Brillouin erbium-doped fiber laser based on optical fiber faraday rotation mirror ring structure

Abstract

The invention discloses a self-excited multi-wavelength Brillouin erbium-doped fiber laser based on an optical fiber Faraday rotation mirror, which is generated by an erbium-doped fiber amplificationbased on a linear gain and a cascaded stimulated Brillouin scattering process based on a nonlinear gain. The apparatus comprises: an erbium doped fiber amplifier EDFA, an optical loop, a single-mode fiber SMF, an optical fiber faraday rotary mirror FRM, an optocoupler and a c-band spectrometer. The invention has the advantages of simple structure, polarization-independent and large number of wavelengths, adopts the ring structure of the Faraday rotating mirror, not only is the laser output not affected by the polarization state, but also can obtain large bandwidth, generates multi-wavelength laser covering the whole c-band, and predicts to obtain about 200 multi-wavelength Brillouin lasers.

Description

technical field [0001] The invention relates to the field of Brillouin erbium-doped fiber lasers, in particular to a multi-wavelength output laser based on erbium-doped fiber linear gain and single-mode fiber nonlinear Brillouin gain. Background technique [0002] Multiwavelength Brillouin lasers have attracted widespread attention due to their wide applications in fiber optic sensing, spectroscopy, microwave photonics and dense wavelength division multiplexing (DWDM) optical communications. In 1997, Cowle et al first proposed a multi-wavelength erbium-doped fiber laser. In the multi-wavelength Brillouin erbium-doped fiber laser, the erbium-doped fiber provides linear gain, and the single-mode fiber provides nonlinear Brillouin gain. Through cascading, multi-wavelength Brillouin lasers with fixed wavelength intervals are output. [0003] Searching in the existing literature found that domestic and foreign scholars (Opt.Lett. published by Y.J.Song et al., 30(5), pp.486-488, ...

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Problems solved by technology

Although the structure has been improved, there are still deficiencies: First, the output of the multi-wavelength laser is related to the regulation of the polarization controller PC. Adjusting the PC has two functions, one is to adjust the polarization state of the laser, and the other is to change the reflection path of the light. Improve the reflectivity of the ring mirror

In the above experiments, the polarization state of the light was changed by adjusting the PC, which affected the intensity of the light and caused excessive loss of light energy; moreover, the adjustment of the PC was limited by the bandwidth of the Sagnac ring mirror, and the number of multi-wavelength laser outputs was small, and the narrow bandwidth could not be occupied. The entire C-band; the adjustment of PC also affects the Brillouin gain of the system. When the Brillouin gain is high enough, the low-order Stokes wave reaches saturation, and the pump power is transferred to the high-order Stokes light. The 980nm pump In the case of limited pump power, it is difficult to generate higher-order multi-wavelength lasers

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