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We describe the design of low-loss and low-crosstalk free-space coupling optics for multi-core fibers and discuss in detail its experimental evaluation.
A pair of compact optical connection modules that connect seven-core multicore fiber and seven single-mode fibers is developed. Insertion loss of , polarization-dependent loss of , and crosstalk of are observed. The structure is applicable to the multicore fiber with more than seven cores.
A novel free-space coupling system combined with a multi-core fiber enables up-scaling to a record space-division-multiplexed (SDM) channel number of 19. We achieve 305-Tb/s transmission over 10.1 km using 19-SDM, 100-WDM PDM-QPSK signals.
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