Ultralow attenuation single mode fiber

Abstract

The invention relates to an ultralow attenuation single mode fiber. The ultralow attenuation single mode fiber comprises a fiber core layer and cladding layers. The ultralow attenuation single mode fiber is characterized in that the radius r1 of the fiber core layer ranges from 3.9 micrometers to 4.8 micrometers, the relative refringence delta n1 ranges from -0.08% to 0.10%, and the fiber core layer sequentially covers an inner cladding layer, an inner caving cladding layer, an outer auxiliary cladding layer and an outer cladding layer from outside to inside. The radius r2 of the inner cladding layer ranges from 9 micrometers to 14 micrometers, and the relative refringence delta n2 ranges from -0.40% to -0.15%. The radius r3 of the inner caving cladding layer ranges from 13 micrometers and 25 micrometers, and the relative refringence ranges from -0.7% to -0.3%. The radius r4 of the outer auxiliary cladding layer ranges from 30 micrometers to 50 micrometers, and the relative refringence ranges from -0.4% to -0.15%. The outer cladding layer is a pure silicon dioxide glass layer. An attenuation parameter of the fiber is lowered so that the fiber can have an ultralow attenuation performance. Comprehensive performance parameters such as the cut-off wavelength, the bending loss and the dispersion are good in an application wave segment, and the G652 standard is compatible. Due to a relatively wide caving cladding layer structure, the good improvement effect is provided for the bending loss of the fiber.

Description

technical field [0001] The invention relates to the field of optical fiber transmission, in particular to a single-mode optical fiber with ultra-low attenuation performance. Background technique [0002] With the rapid growth of IP network data services, operators' demand for transmission capacity continues to increase, and the single-fiber capacity in the existing network is gradually approaching the limit value of 100Tbps. The 100G transmission system has entered the first year of commercial use. How to further increase the transmission capacity on the basis of 100G transmission signals is the focus of attention of various system equipment manufacturers and operators. [0003] The PM-QPSK modulation technology, coherent detection technology and DSP processing technology used in the 100G system reduce the OSNR tolerance of the system to the same level as 10G, reducing the system's requirements for optical fibers. Studies have shown that under the 100G system, ordinary G.6...

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Problems solved by technology

[0004] OSNR limitation, noise and nonlinearity caused by 400G transmission system will limit the transmission distance. From the test results of current mainstream equipment manufacturers, the transmission distance of 400G system using dual carrier and 16QAM modulation technology is only 100G system About 1 / 3 of that, so the construction of a high-speed system needs to comprehensively consider the system capacity and transmission distance requirements

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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