A novel few-mode multi-core fiber with large effective mode area and low inter-core crosstalk

This paper proposes a novel 7-core 5-mode fiber with large mode area and low inter-core crosstalk(XT). The proposed optical fiber, by adopting a combination of air-trench structure and high-index ring, realizes large mode area and low XT. The numerical analyses reveal that the proposed fiber can stably transmit 5 LP modes in the C+L band; the effective mode area of each of the 5 LP modes is larger than 110 mu m2; the XT of in each of the 5 LP modes is smaller than-79 dB/km; each mode has an effective refractive index difference bigger than 1.1 x 10-3. Therefore, a low XT result can still be achieved when the mode area is large. The proposed optical fiber may be well utilized to construct a high-capacity fiber optic transmission system.

Automated summary

This paper presents a novel 7-core 5-mode fiber that has a large mode area and low inter-core crosstalk. By utilizing an air-trench structure and high-index ring, the proposed fiber achieves large mode area and low crosstalk. Numerical analyses demonstrate that the fiber can reliably transmit 5 LP modes in the C+L band, with an effective mode area of each LP mode larger than 110 square micrometers and a crosstalk smaller than -79 dB/km. Each mode has an effective refractive index difference larger than 1.1 x 10-3. Therefore, even when the mode area is large, a low crosstalk can still be achieved. The proposed fiber can be used to construct a high-capacity fiber optic transmission system.