Assembly capable of replacing beam expanding optical fiber and preparation method thereof

Abstract

The invention provides an assembly capable of replacing a beam expanding optical fiber and a preparation method thereof. The assembly comprises a pumping optical fiber, a signal optical fiber, a wavecombining optical fiber, an inserting core and a wave combining device, the signal optical fiber is arranged on the first side of the wave combining device, the inserting core is arranged on the second side of the wave combining device, the first end face of the inserting core is close to the wave combining device, and the pumping optical fiber and the wave combining optical fiber are attached tothe second end face of the inserting core; the pumping optical fiber directly faces the first optical fiber of the inserting core, and the wave combining optical fiber directly faces the second optical fiber of the inserting core; an optical thin sheet is fixed on the first end surface of the inserting core and covers the area wherein the first optical fiber and / or the second optical fiber on thefirst end surface are / is located; and the refractive index of the optical thin sheet is gradually increased from one side close to the insertion core to one side far away from the insertion core. Thepreparation method mainly comprises the step of fixing the optical thin sheet on the first end surface of the inserting core. The mode field matching problem among the pumping optical fiber, the signal optical fiber and the wave combining optical fiber can be effectively solved, and the coupling loss is reduced.

Description

technical field [0001] The invention relates to the technical field of optical fibers, in particular to an assembly that can replace a beam-expanding optical fiber and a preparation method thereof. Background technique [0002] Generally, an optical fiber amplifier needs a device or device for multiplexing the pumping optical signal and the optical signal to be amplified into the same optical fiber. The device includes an optical fiber for inputting a pumping optical signal, an optical fiber for inputting an optical signal to be amplified, and an optical fiber for transmission after multiplexing, with a multiplexing device in the middle. At present, the wavelength of the more economical and applicable pump laser is generally 980 nm. To keep the optical fiber transmission in single-mode mode, a fiber with a small core physical size is used. According to the 980-16 fiber produced by OFS Company It can be known that the mode field diameter (MFD) of 1550nm fiber is 7.5um, and t...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the parameters matching, high production cost, limited beam expansion area and complicated preparation process of the existing beam expansion process, this technical solution proposes a component that can replace the beam expandable optical fiber and its preparation method, which can solve the existing problems. Technical issues, reduce coupling loss, improve coupling efficiency, and improve process capacity

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