Chirality coupling core diameter optical fiber and manufacturing method thereof

Abstract

The invention discloses a chirality coupling core diameter optical fiber and a manufacturing method thereof and relates to the field of optical fiber laser transmission and amplification. The manufacturing method comprises the following steps of: processing a guide fiber core preform semifinished product and a satellite fiber core preform semifinished product to form a satellite fiber core preform and a guide fiber core preform; embedding the satellite fiber core preform into a fiber core slot; carrying out fused biconical taper at the top of the guide fiber core preform to form a chirality coupling core diameter optical fiber preform; and carrying out melting and wire drawing on the chirality coupling core diameter optical fiber preform to form a chirality coupling core diameter optical fiber. Output optical beam quality of the chirality coupling core diameter optical fiber is less than 1.1, fundamental mode loss is less than 0.5dB / m, and high-order mode loss is more than 100dB / m. The chirality coupling core diameter optical fiber manufactured by the invention is good in optical property and reliability, low in manufacturing difficulty and applicable to mass production.

Description

technical field [0001] The invention relates to the field of optical fiber laser transmission and amplification, in particular to a chiral coupling core-diameter optical fiber and a manufacturing method thereof. Background technique [0002] Fiber laser is a laser that uses optical fiber as the fiber medium. Fiber laser has become one of the mainstream lasers in the field of laser applications due to its high conversion efficiency, good heat dissipation performance and stability. [0003] With the continuous expansion of laser application fields, users have higher and higher demands on the output power of fiber lasers. People generally use large-mode-field-area fibers to increase the output power of fiber lasers; since the laser mode oscillation in the large-mode-field fiber core will cause beam quality degradation, in order to optimize the beam quality, people generally reduce the numerical aperture of the fiber core The way. However, the decrease in the numerical apertur...

AI Technical Summary

Problems solved by technology

[0008] (1) When a mechanical drill drills a circular through hole, due to the need to ensure the roughness of the inner surface of the processed through hole and the matching degree between the processed through hole and the satellite core preform, the mechanical drill requires a higher The mechanical processing accuracy; and the mechanical drill drills the through hole, and the strength of the drill bit of the mechanical drill is difficult to control. With the increase of the depth of the processed through hole, the tip of the drill bit of the mechanical drill will produce a swing in the direction of the outer wall of the guiding fiber core preform. Dynamic centrifugal force, which in turn causes the size of the two ends of the processed through hole to be different

Therefore, it is difficult to manufacture chiral coupling core fiber by mechanical drilling method, and it is not convenient for people to manufacture

[0009] (2) When processing by the drilling method, the cross section of the satellite core preform is circular, and the satellite core is located in the center of the satellite core preform. Since the satellite core preform is provided with a certain thickness of cladding, the satellite The distance between the fiber core and the guide core is relatively large; in order to reduce the distance between the satellite core and the guide core, the aperture of the processed through hole and the volume of the satellite core preform must be reduced to reduce the processing The aperture of the through hole and the volume of the satellite core preform are relatively difficult, and the manufacturing is difficult

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