Fig. 3: High-frequency photoresponse and data reception testing of waveguide-integrated tBLG photodetectors.
From: Waveguide-integrated twisted bilayer graphene photodetectors
a Experimental set-up for characterizing the 3-dB bandwidth f3dB. VNA vector network analyzer, EDFA erbium-doped fiber amplifier, PC polarization controller, RF radio-frequency, DUT device under test. b Experimental set-up for detecting the eye diagram. AWG arbitrary waveform generator, RTO real-time oscilloscope. c Measured frequency response at a Vb of 0.5 V. 3-dB cutoff is marked by the red dash line. d Obtained eye diagram for 50 Gbit s−1 on-off keying (OOK) data stream. e Comprehensive comparisons of photoresponsivity and 3-dB bandwidth f3dB of our tBLG device with waveguide-integrated SLG12,13,36,44,45,46,47,48,49,50,51,52,53,54 and BLG9,35,44 photodetectors in previous reports.
