Fig. 6: Characterization of the 8-channel DWDM transmitter.
From: An 8×240 Gbps dense wavelength division multiplexing transmitter with lithium tantalate

a Optical microscopic image of the 8-channel DWDM transmitter. b Experimental setup for obtaining eye diagrams. c Measured 120 GBaud OOK and PAM4 eye diagrams. Pr-doped fiber amplifier (PDFA), electrical sampling oscilloscope (ESO), arbitrary waveform generator (AWG), Radio Frequency (RF), Multimode Interference (MMI).