Low attenuation single-mode optical fiber and preparation method thereof

Abstract

The present invention relates to a low attenuation single-mode optical fiber and a preparation method thereof. The low attenuation single-mode optical fiber comprises a core layer and a cladding layer. The low attenuation single-mode optical fiber is characterized in that the radius r1 of the core layer is 3.5 to 4.0 micrometers, the relative refractive index difference Delta1 of the core layer is 0.33%to 0.36%, an inner cladding layer and an outer cladding layer are orderly coated from inside to outside outside the core layer, the radius r2 of the inner cladding layer is 12 to 14 micrometers, the relative refractive index difference Delta2 of the inner cladding layer is 0.01%to 0.01%, the radius r3 of the outer cladding layer is 62 to 63 micrometers, and the outer cladding layer is a pure silica glass layer. A core rod is manufactured through VAD process, the glass core rod with a germanium and chlorine doped core layer and a fluorine and chlorine doped inner cladding layer is obtained, the core rod is sleeved in a pure silica outer sleeve tube, or the outer cladding layer is deposited outside the core rod through OVD process, a prefabricated rod for drawing can be obtained, and the prefabricated rod is drawn in a drawing speed of 1500 to 3300 m/min to form an optical fiber. According to the low attenuation single-mode optical fiber and the preparation method, through doping chlorine, a core layer germanium doping amount is reduced and core layer and cladding layer viscosity matching is improved to realize the low attenuation of the optical fiber, and optical fiber preparation process is simple, the production cost is low, the process is stable, and the qualified rate of output is high.

Description

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AI Technical Summary

Benefits of technology

This patented technology improves the quality of optical waveguides made from silicon dioxide (SiO2) material used in communication devices such as laser diodes or detectors. By adding dopants like boron nitride (BN) or phosphorus pentoxygen tetrafluoroethylene (PBOE), it becomes possible to decrease rhenishness and increase light transmission efficiency without affecting other properties found on these materials. Additionally, this method allows for easy control over the composition of the SiON layers while maintaining good adhesion between them. Overall, this new technique makes manufacturing processes faster and easier compared to traditional methods.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the performance of optically amplified systems over longer distances without increasing their size. Current methods involve decreasing signal intensity through increased numerical aperture NA while maintaining good quality factors like transmitting signals. However, these techniques have limitations because they require expensive equipment components and may result in reduced reliability issues when applied on shorter lengths. To address these challenges, researchers developed new materials called rare earth elements, including yttrium oxide nanocrosion cores containing Ce(III). These rare metals also provide improved properties compared to traditional fluorescent dye coatings. Additionally, current processes utilizing halides suffer from environmental concerns associated with them. Therefore, alternative solutions must be explored.

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