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Fig. 2 | Journal of the European Optical Society-Rapid Publications

Fig. 2

From: Quantum dash multi-wavelength lasers for Tbit/s coherent communications and 5G wireless networks

Fig. 2

a Schematic of the experimental setup for the performance of the QD MWL, including OSA, OBPF, the RIN tested by the relative intensity noise measurement system, the optical linewidth tested by the OE4000 automated laser linewidth measurement system and the RF beating signals tested by the PXA signal analyzer with the photodetector (PD). b Optical spectrum of a QD MWL with a cavity length of 1227 μm, measured at 350 mA and 18 °C (Noise floor: − 60 dBm and resolution bandwidth (RBW): 0.01 nm); c RF beating frequency of 34.224 GHz between any two adjacent channels (RBW: 5 kHz). d The narrow span RF peak with Lorentzian fit (RBW: 1 kHz)

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