Fig. 10: Representative RNG schemes based on low-coherence light sources.
From: Low-coherence semiconductor light sources: devices and applications
a RF spectrum of the optical noise from the SLED and from the background noise with the SLED off. b Optical spectrum of the SLED with its two spectrally sliced channels measured with a resolution bandwidth of 0.1 nm38. Reproduced with permission from Li, X. et al. Copyright 2011 OPTICA. c Experimental setup of multi-channel QRNG scheme, which includes an SLED as the low-coherence light source, a dense wavelength division multiplexing (DWDM) module used to slice the spectrum; optical attenuators (ATTs) used to adjust the intensity; photodetectors (PDs) used to receive the signal; and 12-bit analog-to-digital converters (ADCs). d The broad-area violin-cavity designed to accommodate a large number of modes. e The lasing emission at one facet of the 600-μm-long cavity captured using a streak camera. f The correlation function of the measured lasing emission intensity exhibits spatial and temporal correlation widths of 1.5 μm and 2.8 ps, respectively242. Reproduced with permission from Kim, K. et al., 2021 IEEE Photonics Conference (IPC). Copyright © 2021, IEEE.
