Real-Time 100-GS/s Sigma-Delta All-Digital Radio-Over-Fiber Transmitter for 22.75–27.5 GHz Band

We present the first real-time 100-GS/s FPGA-based sigma-delta modulator to enable all-digital radio-over-fiber transmission in the 22.75-27.5GHz band. 4.68Gb/s (2.34Gb/s) 64-QAM is transported over 10-km SSMF at 1562nm with 6.46% (4.73%) EVM.

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