DS2. Experimental Characterization of an S-/C-band wavelength-tunable ECL–MZM transmitter for optical frequency comb generation_SPRINTER

This dataset presents the experimental characterization of an ultra-fast, wavelength-tunable transmitter operating in the S- and C-bands, built around a hybrid external cavity laser (ECL) integrated with an InP Mach-Zehnder modulator (MZM). The ECL uses an InP reflective semiconductor optical amplifier (RSOA) as the gain medium, with a TriPleX waveguide circuit. The InP-MZM is hybridly co-integrated with this laser source and is designed to support on-off keying (OOK) NRZ modulation at baud rates up to 10 Gbps. Rather than characterizing data-transmission performance, this dataset uses the ECL as the optical source to investigate the optical frequency comb (OFC) response of the transmitter. The OFC spectra are recorded at different MZM bias points, with the tone spacing determined by the applied RF drive frequency. Combs were generated and examined at drive frequencies of 2 GHz and 10 GHz, confirming stable, well-behaved comb formation across this range and verifying the good operation of the ECL as a coherent optical source. The collected data consist of optical spectra captured using an optical spectrum analyzer (OSA), providing spectral measurements of the generated frequency combs under different operating conditions. Such combs provide multi-wavelength, phase-coherent references useful for coherent communications and for photonic RF/mmWave/sub-THz generation via optical injection locking.