MULTI-CORE FIBER INTERLEAVER, OPTICAL FIBER AMPLIFIER, TRANSMISSION SYSTEM, AND TRANSMISSION METHOD

Embodiments of the present disclosure provide example multi-core fiber interleavers, example optical fiber amplifiers, example transmission systems, and example transmission methods. One example multi-core fiber interleaver includes a first port, a second port, a third port, and a fourth port, respectively adapted to be coupled to a first multi-core fiber, a second multi-core fiber, a third multi-core fiber, and a fourth multi-core fiber. A first subset of a plurality of first cores is coupled to a first subset of a plurality of second cores. A first subset of a plurality of third cores is coupled to a first subset of a plurality of fourth cores. A second subset of the plurality of fourth cores is coupled to a second subset of the plurality of second cores. A second subset of the third cores is coupled to a second subset of the first cores.