Multi-wavelength erbium-doped optical fiber laser based on parallel non-linear polarization rotation structure

Abstract

The invention relates to a multi-wavelength erbium-doped optical fiber laser based on a parallel non-linear polarization rotation structure, which comprises a pump source, a wavelength-division multiplexer, a erbium-doped optical fiber, a polarization dependent isolator, a first optical coupler, a first polarization controller, a second optical coupler, a second polarization controller, an ordinary single-mode optical fiber and a polarization-maintaining optical fiber; and the structure is based on polarization rotation effect, the polarization controller in a parallel structure is adopted to form the non-linear polarization rotation structure, so that a multi-wavelength narrow-line width optical fiber laser is realized. Compared with other erbium-doped optical fiber lasers, the structure with non-linear polarization rotation effect inhibits mode competition caused by the homogeneous broadening effect of the erbium-doped optical fiber, so that the multi-wavelength laser output is stable; and the multi-wavelength erbium-doped optical fiber laser based on the parallel non-linear polarization rotation structure is in the parallel structure, so that twice of polarized rotation occurs every time when an optical signal runs in a resonator, the utilization rate of the pump source is improved, the quantity and the power of output laser are increased, and the multi-wavelength erbium-doped optical fiber laser based on the parallel non-linear polarization rotation structure has the advantages of compact structure, low cost, stability in work at room temperature and the like.

Description

technical field [0001] The invention belongs to the technical field of high-speed optical fiber communication and laser, and in particular relates to the design of a multi-wavelength erbium-doped optical fiber laser. Background technique [0002] Multi-wavelength fiber lasers are currently a research hotspot in the field of wavelength division multiplexing high-speed communication systems. At present, in wavelength division multiplexing networks, semiconductor distributed feedback lasers are generally used as light sources. However, each wavelength division multiplexing branch requires a stable distributed feedback laser light source, which leads to system complexity, increases system cost, and cannot meet stability requirements. In a small-scale WDM network (generally less than 10 branches), it is particularly important to reduce the cost and complexity of the light source. Thus, multi-wavelength lasers increase the economics of WDM technology. [0003] Multi-wavelength ...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of limited number of output wavelengths and difficulty in maintaining stability in the serial structure in the prior art, and to provide a multi-wavelength erbium-doped fiber laser based on a parallel nonlinear polarization rotation structure, which realizes low cost, high structure Compact, narrow-linewidth, multi-wavelength novel erbium-doped fiber laser

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