Broadband dispersion compensating fiber, preparation method thereof and broadband dispersion compensating module

Abstract

The invention relates to a broadband dispersion compensation optical fiber, a manufacture method and a broadband dispersion compensation module. The broadband dispersion compensation optical fiber comprises a core layer and a cladding layer surrounding the core layer; the core layer of the optical fiber comprises four concentric sublayers of the fiber core; each sublayer of the fiber core is provided with different relative refractive index and radius; the cladding layer surrounding the core layer is a pure silica glass layer or a quartz glass layer which is partly doped with Freon. The broadband dispersion compensation optical fiber is provided with a dispersion compensation ratio and a higher quality factor, which is helpful for the compensation of link accumulation positive dispersion in the communication system. The invention improves the transmission speed and capacity of dense wave division in the communication system.

Description

technical field [0001] The invention relates to broadband dispersion compensation optical fiber, its manufacturing method and broadband dispersion compensation module. It is especially suitable for dispersion compensation in the 1530nm-1625nm (C+L band) communication band. It has a high figure of merit (FOM) and a wide band dispersion compensation capability, as well as a second-order dispersion compensation capability. 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, and now it is as high as 40Gbit / second, even 160Gbit / second. However, the conventional single-mode fiber (G.652) has a ...

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Problems solved by technology

U.S. Patent US6757468B2 describes a C+L band (1530nm-1625nm) dispersion compensating fiber, which is prepared by external vapor deposition (OVD). Although the 1550nm dispersion can reach -130ps / nm·km, the cutoff wavelength of the fiber is at Between 1660nm and 1760nm, the bending loss of optical fiber is relatively large, which will affect the working stability of optical fiber devices

US Patent US7197219B2 describes a dispersion compensation module made of a dispersion compensation fiber with a simple W-shaped refractive index profile. The dispersion of the dispersion compensation fiber in the range of 1520nm-1570nm is -70~-140ps / nm·km, and the absolute value of negative dispersion Not big enough, and the patent does not involve important indicators such as the attenuation of the dispersion compensation fiber, the quality factor, and the insertion loss of the module, so it cannot fully evaluate the performance of the dispersion compensation fiber and its module

The US patent US7194171B2 describes a dispersion compensating optical fiber. The dispersion of its 1550nm wavelength is -82~-29ps / nm·km, and the negative dispersion value is too small to meet the application requirements.

Chinese patent CN1629667A describes a W-shaped dispersion compensating fiber and its module, but this patent does not involve key indicators such as quality factor and insertion loss, and cannot fully evaluate the performance of the dispersion compensating fiber and its module

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