Optical fiber and manufacturing method thereof

Abstract

The invention discloses an optical fiber and a manufacturing method thereof. The optical fiber comprises a fiber core layer and a wrapping layer; the fiber core layer is covered with the wrapping layer. The wrapping layer comprises an inner wrapping layer, a sunk wrapping layer and an outer wrapping layer in order from inside to outside. The optical fiber satisfies the following relations: delta 1 which is equal to n1-n0 is greater than -0.05% and less than -0.05%, delta 2 which is equal to n2-n0 is greater than -0.4% and less than -0.2%, delta 3 which is equal to n3-n0 is greater than -0.6% and less than -0.3%, and delta 4 which is equal to n4-n0 is greater than -0.3% and less than -0.1%, wherein n0 is the refractive index of pure quartz, n1 is the refractive index of the fiber core layer, n2 is the refractive index of the inner wrapping layer, n3 is the refractive index of sunk wrapping layer and n4 is the refractive index of the outer wrapping layer.

Description

technical field [0001] The present invention relates to the field of optical fiber transmission, in particular to a production method of a large effective area and low loss optical fiber preform. Through the combination of PCVD+RIC, not only can a large effective area and low loss optical fiber be produced, but also the RIC method is suitable for large-scale production , More specifically, the present invention relates to an optical fiber and a manufacturing method thereof. Background technique [0002] With the development of international communication services, especially the rapid development of Internet technology and 3G and passive optical network technologies, the demand for optical fiber bandwidth in communication systems shows a rapid growth trend. In communication systems with long-distance, large-capacity, and high-speed transmission, optical fiber amplifier technology and wavelength division multiplexing technology are usually required, especially in backbone net...

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Problems solved by technology

[0003] The patent document publication number is CN103257393A "A Large Effective Area Optical Fiber", which provides a 5-layer waveguide structure design, including two core layers and three layers of cladding. The waveguide design is too complicated and difficult to control. , the size of the light rod is small, it is difficult to apply to large-scale production

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