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Low-cross-talk and multi-channel heterogeneous 13-core four-LP mode fiber with a high refractive index ring and a trench

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Abstract

We propose a heterogeneous 13-core few-mode fiber, which is characterized by the combination of a high refractive index ring and a trench. All cores of the optical fiber can stably transmit ${{\rm LP}_{01}}$, ${{\rm LP}_{11}}$, ${{\rm LP}_{21}}$, and ${{\rm LP}_{02}}$ modes in the C$+$L band through structural optimization and numerical analysis. The effective refractive index difference of the ${{\rm LP}_{21}}$ and ${{\rm LP}_{02}}$ modes reaches ${2} \times {{10}^{- 3}}$, which is conducive to the independent transmission of modes. The trench can effectively suppress the inter-core cross talk below ${-}{50}\;{\rm dB/km}$ at 1550 nm. The proposed few-mode multi-core fiber is conducive to solving the long-distance signal transmission problem of large capacity and low cross talk in future optical communication systems.

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