Erbium-doped multi-core broadband amplification optical fiber

Abstract

The embodiment of the invention discloses an erbium-doped multi-core broadband amplification optical fiber, which comprises a signal core; the wrapping layer and the coating layer sequentially wrap the circumferential outer side of the signal core from inside to outside; wherein the signal core comprises a central core and six surrounding cores, the six surrounding cores are arranged around the central core and form a regular hexagon structure, each surrounding core is located at a corresponding vertex of the regular hexagon structure, the central core is located at the center of the regular hexagon structure, and the distance between every two surrounding cores is not less than 10 [mu] m; the distance between each peripheral core and the central core is not less than 10 [mu] m. According to the invention, the doping concentration of the rare earth ions in the optical fiber can be improved, the rare earth ions are not clustered during high-concentration doping, and the gain bandwidth is relatively wide, so that the communication capacity of a single channel of the multi-core optical fiber can be further expanded, and the transmission capacity of an optical fiber transmission system is greatly improved.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to an erbium-doped multi-core broadband amplifying optical fiber. Background technique [0002] From the ancient beacon fire and wolf smoke to generate optical signals for information transmission, to telephone, telegraph, and now to the Internet connecting the world, communication technology has experienced an evolutionary process from low frequency to high frequency to microwave and then to optical frequency. The emergence and development of optical fiber communication technology is a major change in the history of telecommunications. At present, more than 80% of the information in the world is transmitted through optical fibers, and the future communication technology is based on optical fiber communication technology. However, with the development of Internet of Things, big data, cloud computing and other technologies, the demand for communication system cap...

AI Technical Summary

Problems solved by technology

[0004] In the existing multi-core erbium-doped fiber used for broadband amplification, the gain bandwidth of the traditional silica fiber after doping erbium is only 35nm-40nm, so the transmission capacity of a single-core multi-core fiber used in the transmission system is limited, in order to further expand the gain bandwidth and improve the transmission capacity of optical communication, the gain capability of the fiber can be enhanced by increasing the doping concentration of rare earth ions in the optical fiber, such as increasing the doping concentration of erbium-doped ions, and then obtain a higher Wide 3dB bandwidth, however, there are still many problems in practical applications by increasing the doping concentration of erbium-doped ions to enhance the gain capability of the fiber. For example, too high doping of erbium ions will cause the concentration of erbium ions to Can reduce the gain of optical fiber; Another example is that the Chinese authorized patent (authorization number is CN 111517637 B) has announced a kind of rare earth-doped multi-core optical fiber, optical fiber prefabricated rod and its preparation method and application, but this method is vapor phase deposition method, and this method produces Low efficiency, poor uniformity, difficulty in high-concentration doping, and ultimately higher cost and poor stability of the product

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