A cladding optical power stripping method of a double-clad optical fiber

Abstract

The invention provides a cladding optical power stripping method of a double-cladding fiber. The method comprises the following steps of (1) preparing a mechanical element, (2) removing and recoating a double-cladding fiber outer layer, and (3) placing the double-cladding fiber in the mechanical element. According to the cladding optical power stripping method of the double-cladding fiber, a signal light high order mode and an ASE high order mode in a fiber core can be leaked to cladding, so that amplified spontaneous emission of the fiber core is restrained, and the transmitting mode and the light beam quality of signal light in the fiber core are improved. The divergence angle of light transmitted in the cladding is enlarged, the optical power of the large divergence angle cladding can be more effectively absorbed and stripped, and thus the stripping efficiency is improved. The cladding optical power stripping method of the double-cladding fiber has the advantages that the structure is simple, the manufacturing cost is low, and the method is suitable for mass production.

Description

technical field [0001] The invention relates to a method for stripping cladding light power in a double-clad optical fiber, which belongs to the technical field of optoelectronics. Background technique [0002] Since E.Snitzer first described cladding-pumped fiber lasers in 1988, double-clad fibers have gradually been widely used in the fields of fiber lasers and fiber amplifiers. The emergence of double-clad fibers effectively improves the coupling efficiency and absorption efficiency of pump light in fiber lasers, and greatly improves the output efficiency of fiber lasers. The working principle of cladding pumping technology is: the pump light is injected into the inner cladding of the optical fiber in an oblique manner, and repeatedly passes through the fiber core in the form of refraction, so that the pump light is absorbed by the rare earth ions in the fiber core, and the laser light produced propagates along the fiber core. Ideally, all signal light would be amplifie...

AI Technical Summary

Problems solved by technology

Its disadvantages are: firstly, it needs a longer absorption length; secondly, the stripping efficiency is low, especially for cladding power with small divergence angle; thirdly, the inhibition effect on ASE in the fiber core is not obvious

Chinese Patent Publication No. CN102208741A, named as a high-efficiency residual pump light attenuation method, is to remove a section of outer cladding and coating layer of the double-clad optical fiber at the output end of the fiber laser, and then make a long-period optical fiber in the middle of the section of optical fiber Grating, whose bandstop wavelength is matched to the wavelength of the pump light to attenuate the remaining pump light in the inner cladding, but not the signal light from the fiber laser

The disadvantage is that the ASE suppression effect in the fiber core is not obvious

The role of the first section of coating material is to increase the divergence angle of light in the cladding; the role of the second section of coating material is to attenuate the cladding optical power Improvement, but the structure is complex and the process is difficult to control

At the same time, the suppression effect on ASE in the fiber core is not obvious

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