Single-double wave convertible wavelength location and interval adjustable erbium doped fibre-optical laser

Abstract

The invention relates to a double-wavelength Erbium-doped optical fiber laser, especially a convertible single double-wavelength, regulable wavelength position and space, stable output laser, including reflector, pumping laser, wavelength division multiplexing optical coupler, Erbium-doped optical fiber, polarization controller, etc. It utilizes elastic optical effect to cause stress double refraction in optical fiber, to make two reflecting films with orthogonal polarizing directions of Prague grating separated from each other in wavelength, utilizes polarization hole burning effect to overcome mode competition caused by Erbium-doped optical fiber uniform gain widening, implementing double-wavelength stable output at normal temperature, by changing magnitude of force applied on axial and side directions, respectively controls and tunes position and space of two wavelengths. By adjusting polarization controller, it changes in-cavity polarizing state to implement switching between single double wavelengths. It has simple structure, convenient adjustment, low cost and stable working at normal temperature.

Description

technical field [0001] The invention relates to a dual-wavelength erbium-doped fiber laser, in particular a laser capable of switching between single and dual wavelengths, adjustable in the wavelength position and wavelength interval of two laser outputs, and stable at room temperature. Background technique [0002] Multi-wavelength erbium-doped fiber lasers are widely used in the fields of optical communication and optical sensing. For example, in dense wavelength division multiplexing systems, multi-parameter optical fiber sensors and optical soliton sources, this kind of light source is extremely important. However, due to the mode competition caused by the gain broadening effect in the erbium-doped fiber, it is difficult to achieve multi-wavelength output at room temperature in a laser cavity. At present, to achieve multi-wavelength output, the following methods are generally adopted: one method is to cool the erbium-doped fiber in liquid nitrogen to reduce gain broadeni...

AI Technical Summary

Problems solved by technology

However, due to the mode competition caused by the gain broadening effect in the erbium-doped fiber, it is difficult to achieve multi-wavelength output at room temperature in a laser cavity

At present, to achieve multi-wavelength output, the following methods are generally adopted: one method is to cool the erbium-doped fiber in liquid nitrogen to reduce gain broadening, but this method is obviously not practical

Another method is to couple multiple fiber lasers with wavelength division multiplexing. Although it can obtain stable multi-wavelength output at room temperature, it requires multiple drive circuits and laser cavities.

Another method is to insert a frequency shifter in the cavity, but the disadvantage is that it is expensive

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