Fig. 2
From: Nonlinear optical components for all-optical probabilistic graphical model
Wavelength multiplexing architecture. a ln-sum-exp scheme to multiply two numbers. b Schematic representation of the sum-product message passing algorithm (SPMPA) for node m. The spectral bandwidth is divided equally as a representation of each node (different color indicates different wavelength). The summation unit sums across wavelength for each probability vector that emerges from the natural logarithm (ln) modules
