Design of M-type core trench-assisted multi-core fiber with a cladding diameter of 200 µm for low-crosstalk long-haul transmission

Abstract

The design of homogenous trench-assisted multi-core fiber with M-type cores and a cladding diameter of 200 µm is proposed by numerical simulations. The M-type core is introduced to reduce the inter-core crosstalk (XT) of a 19-core fiber to below −30 dB/100 km with a low cost of cutoff wavelength. At the same time, the trade-off between the XT suppression and the effective area of the fundamental mode is mitigated to ensure the effective area is larger than 70 μm2 to suppress the non-linear effects. The study of the effects of the high-index ring of the M-typed core on the XT, effective area, and power fraction shows the potential in improving the fiber performance by a well-designed micron structure of the core. The bending performance shows this design can operate with low loss and crosstalk, and an effective area of over 70 μm2 at a bending radius from 15 mm to 500 mm. The proposed design provides the possibility to improve the MCF performance for long-haul transmission.