Abstract
We present an ultra-compact dual-polarization coupler working at normal incidence to the chip surface for use with multi-core fibers with a core-to-core spacing down to 15 µm. The coupler achieves an unprecedented efficiency of −3.8 dB for a device with a footprint of only 100 µm2 and a 3-dB bandwidth of 59 nm.
© 2023 The Author(s)
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