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A 10-GBd 40-Gb/s coherent optical transport is a promising technology for higher data rate communications by virtue of improved sensitivity and high spectrum efficiency. One of the major challenges in designing a 40-Gb/s coherent quadrature-phase-shift-keying receiver is to achieve high-speed data conversion at around 20-GHz sampling rate with at least 5-bit resolution. With the detailed design framework...
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