Fig. 3: Multi-band wireless communication results.
From: Ultrabroadband on-chip photonics for full-spectrum wireless communications
a, Setup for end-to-end wireless communication experiments. Insets i–vi show the optical and electrical spectra at important locations of the circuit. b, Measured constellation diagrams in different frequency bands. c, Summary of the measured BERs in different frequency bands. Orange and blue dashed lines correspond to the hard-decision and soft-decision forward error correction thresholds, respectively. AWG, arbitrary waveform generation; MRR, microring resonator; IQ mod.*, in-phase and quadrature modulator. We used a commercial IQ module with integrated bias point control to currently replace the on-chip IQ modulator, which simplified the complexity of the communication experiment and prevented additional imbalance. EDFA, erbium-doped fibre amplifier; EA, electrical amplifier; BPF, optical band-pass filter, BNF, optical band-notch filter.
