Mode filtering fiber

Abstract

The invention discloses a mode filtering fiber. The mode filtering fiber is characterized in that a cladding layer is formed by a matrix material, high-refractive index dielectric cylinders and a high-refractive index dielectric ring; the high-refractive index dielectric cylinders are periodically distributed on a low-refractive index matrix material; the high-refractive index dielectric ring is positioned outside the low-refractive index matrix material and the high-refractive index dielectric cylinders; a fiber core is positioned at the center of the fiber. According to the mode filtering fiber provided by the invention, a super-mode group is formed by the high-refractive index dielectric cylinders, the super-mode group is coupled to a fiber core mode, and high leakage consumption is obtained by the super-mode group through the high-refractive index dielectric ring, so an effective mode filtering mechanism is formed, and a selective mode filtering of the fiber can be realized; multiple fibers having different mode filtering functions are connected in series, so that multiple fiber modes can be filtered, and only a single high order mode can be transmitted by a few-mode fiber; other modes in the fiber can be transmitted at low consumption while the corresponding modes are filtered.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a microstructure optical fiber with the function of selectively filtering out the transmission mode in the fiber core. Background technique [0002] The information capacity of single-mode optical fiber has been greatly improved through time division multiplexing, wavelength division multiplexing, polarization multiplexing and other technologies, and it is close to the limit. In recent years, the method of using multi-core optical fiber or few-mode optical fiber to transmit different information through different cores or different modes in the same optical fiber, the so-called space division multiplexing technology, has aroused widespread interest. In the space division multiplexing system, each signal carries different information, and each signal can realize large-capacity communication through time division multiplexing and wavelength division multiplexing technolog...

AI Technical Summary

Problems solved by technology

However, since the bandgap in this structure is generally narrow, its binding ability to high-order modes is weak, so the leakage loss of high-order modes is often large [Opt.Express, 2010, 18(9): 8906-8915]

[0006] The fiber structure that can effectively filter out specific modes in the fiber while maintaining low-loss transmission of other modes has not been reported yet.

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