A single-mode optical fiber with a lower attenuation coefficient

Abstract

The invention relates to a single mode fiber with a low damping coefficient. The single mode fiber with the low damping coefficient comprises a core layer and a cladding layer and is characterized in that the radius r1 of the core layer is 3.9-4.6Mum, the relative index of refraction delta1of the core layer is 0.08%-0.24%, the core layer covers an inner cladding layer, an concaving inner cladding layer, an auxiliary outer cladding layer and an outer cladding layer from interior to exterior, wherein the radius r2 of the inner cladding layer is 8-15Mum, the relative index of refraction delta2 of the inner cladding layer is-0.30 %--0.05 %,the radius r3 of the concaving inner cladding layer is 14-20Mum, the relative index of refraction delta3 of the concaving inner cladding layer is -0.6 %--0.2 %, the radius r4 of the auxiliary outer cladding layer is 35-50Mum, and the relative index of refraction delta4 of the auxiliary outer cladding layer ranges from -0.35 % to -0.05 %. The outer cladding layer is a pure silicon dioxide glass layer. The single mode fiber with the low damping coefficient has the advantages that the damping coefficient of a fiber is reduced, and through the reasonable design on the section face of each core and cladding layer of the fiber, the fiber is provided with a MFD equal to or larger than 8.7Mum; the section face of the fiber adopts a multilayer step-pattern concaving cladding structure, the wide cladding structure is used for limiting fundamental mode reveal, and a good improvement function on the bending loss of the fiber is achieved.

Description

Technical field [0001] The invention relates to the technical field of optical fiber transmission, in particular to a single-mode optical fiber with a lower attenuation coefficient. Background technique [0002] In 100G high-speed transmission systems, coherent receiving systems and digital signal processing DSPs are widely used. Since chromatic dispersion and polarization mode dispersion can be linearly compensated in the electrical domain of the output end, they can no longer be regarded as long-distance high-speed transmission system performance. The main limiting factor of the current, more difficulties and hotspots now focus on how to reduce the attenuation and nonlinear effects of the fiber, which are two factors that are difficult to compensate with signal processing. [0003] In 100G and super 100G systems, the receiving end adopts coherent reception and digital signal processing technology (DSP), which can digitally compensate the accumulated dispersion and polarization mo...

AI Technical Summary

Problems solved by technology

For the design of this pure silicon core, it requires complex viscosity matching inside the optical fiber, and requires extremely low speed in the drawing process to avoid the increase of attenuation caused by defects inside the optical fiber caused by high-speed drawing, and the manufacturing process is very complicated.

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