Abstract
We present two kinds of fully degeneracy-lifted solid-core photonic crystal multi-mode fibers aiming at multiple-input multiple-output-free direct fiber vector eigenmode multiplexing transmission. One of the target fiber structures is able to support 52 fully separated eigenmodes with effective index difference above and confinement loss below over the whole band (1530–1625 nm). Specifically, it is suggested that effective index separation is sufficient to possess polarization-maintaining properties, while for short-reach stable mode-division multiplexing transmission, the effective index difference is highly desired. In particular, the other target fiber structure can further increase effective index separation above among 24 eigenmodes with confinement loss below over the whole band.
© 2019 Optical Society of America
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