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We developed a single-chip InP coherent receiver for detection of PDM-QPSK signals, which meets specifications for 100G between 1530 and 1570 nm. Integration includes a mode converter for efficient coupling from an SMF array.
We demonstrate a tapered dual-core fiber that splices to standard fiber at one end and butt couples to an uncoated InP ridge waveguide at the other, achieving a fiber-to-chip coupling loss of ~1.8 dB.
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