Fig. 6: Long duration operation measurement.
From: Massive-scale spatial multiplexing of multimode VCSELs with a 3D-printed photonic lantern
a Experimental setup. TEC Thermoelectric Cooler, TS Temperature sensor, PID Proportional, Integral, and Derivative, MO microscope objective, PD photo-detector. b Temperature vs time, showing the temperature fluctuations. c Measured PL output Power [mW] vs time for different injection current values.
