Design of ring-core few-mode multi-core fiber with lowcross talk and low bending loss

Authors：Zhang Yuan; Jiang Wen-Fan; Chen Ming-Yang^*

Source：Acta Physica Sinica, 2022, 71(9): 094205.

DOI：10.7498/aps.71.20211534

• few mode multi-core fiber
• inter-core crosstalk
• bending loss
• mode field

Aiming at solving the problems of coupling between modes in a core and mode coupling between cores infew-mode multi-core fiber, a fiber with seven cores each with step index is proposed, and each core can supportfive modes. Each core has a central low refractive index region and a high refractive index ring to ensure thatthere is a large refractive index difference between modes in the core, so as to reduce the problem of modecoupling. The bending loss of central core and outer core, the crosstalk characteristics between modes and theinfluence of core parameters on crosstalk performance are simulated and analyzed by the finite element method.The simulation results show that at a wavelength of 1.55 mu m and a bending radius of 50 mm, the bending lossof the proposed multi-core fiber is much lower than its attenuation loss, and the crosstalk between the adjacentcores of the five core modes are less than -20 dB/100 km. Therefore, this multi-core fiber can realizeindependent transmission of the core modes with long-distance under small bending radius

• Institution
  江苏大学