High-attenuation optical fiber and manufacturing method of same

Abstract

The present invention relates to the technical field of optical fiber manufacturing, in particular to a high-attenuation optical fiber and a manufacturing method of the same. The high-attenuation optical fiber comprises a core layer and a cladding layer around the core layer, the outer surface of the cladding layer is coated with an organic coating material, the core layer is made of metal ions with high capacity in absorption of light with wavelengths of 1250-1625nm, and the metal ions have a characteristic of smooth absorption within the wave band and comprise cobalt ions and iron ions or comprise the cobalt ions and chromium ions. By adopting the high-attenuation optical fiber and the manufacturing method, the demands of applications in high-capacity dense wavelength division communication systems, high-power CATV (cable television) systems and other telecommunication systems, and the performance of the systems in transmission and reception can be improved.

Description

technical field [0001] The invention relates to the technical field of optical fiber manufacturing, in particular to a high-attenuation optical fiber and a manufacturing method thereof. Especially refers to the high-attenuation optical fiber with high absorption in the wavelength range of 1250nm to 1625nm used by the optical fiber attenuator. The optical fiber has the function of attenuating the optical signal power of the communication system. Background technique [0002] With the increasingly widespread application of network technology, people's demand for broadband transmission is growing rapidly. Therefore, optical communication systems need to continuously increase transmission distance, transmission capacity and increase transmission rate. The transmission rate of optical fiber communication is from the initial megabit / second (Mbps), 2.5Gbit / second (Gbps) to 10Gbit / second, 40Gbit / second, and now it is as high as 100Gbit / second, even 160Gbit / second. The wavelength di...

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Problems solved by technology

[0007] U.S. Patent 05841926 introduces a high-attenuation optical fiber, which describes the waveguide structure of the high-attenuation optical fiber, but does not elaborate on the preparation method and characteristics of the high-attenuation optical fiber

[0008] U.S. Patent US6498888 introduces a high-attenuation optical fiber, and describes the waveguide structure for filtering cladding modes. The patent lists the absorption properties of two high-attenuation optical fibers, but the absorption coefficients of these two high-attenuation optical fibers at 1310nm and 1550nm wavelengths The difference is above 10dB / m

[0009] The international patent WO02 / 061476A1 proposes a high-attenuation optical fiber. The patent points out the technical route of the multi-material system, but the patent does not clearly indicate the concentration of the doping material and the detailed preparation method. The patent description is incomplete, and the patent prepared The deviation of the absorption coefficient of the high-attenuation fiber in the wavelength range of 1200nm to 1600nm is ±0.40dB~±1.0dB, and the absorption flatness is not good, which cannot meet the application requirements

[0010] None of the above-mentioned patents have well explained the preparation method of high-attenuation optical fiber, and neither have solved the problem of absorption flatness of different wavelengths of high-attenuation optical fiber.

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