Figure 1 (IMAGE)
Caption
Fig. 1 A. The schematic of the FDML OEO utilizing a 1 km-long single mode fiber (SMF), which is realized by a TFLN photonic integrated chip (PIC) consisting of a Mach-Zehnder modulator (MZM), an electrically tunable add-drop micro-ring resonator (MRR), and two beam splitters. The oscillating RF frequency is given by beating the un-modulated optical carrier from the upper arm and the modulation sideband selected by the MRR at the PD. As the MRR passband is swept by an applying periodic driving signal, the frequency of the generated RF signal also sweeps accordingly to give out the LCMW, with a frequency tuning range equal to half of the MRR's free spectral range (FSR) from FSR/2 to FSR. B. Measured phase noise curves of the 40, 50, 60 and 65 GHz oscillations of the OEO, as compared with that of a 50 GHz signal from a commercial microwave source (Keysight E8257D). C. Real-time frequency distribution of the LCMW signal, showing an unprecedented scanning bandwidth of 30 GHz, with a linearity greater than or equal to 0.9992.
Credit
Xinlun Cai et al.
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Credit must be given to the creator.
License
CC BY