This paper provides an overview of architectures for nonlinear transformations used in optical image processing. The emphasis is on the decomposability of certain nonlinear transformations as serial (cascaded) and parallel (multiplexed) combinations of elementary operations.
Bahaa E. A. Saleh,
"Architectures For Nonlinear Optical Image Processing", Proc. SPIE 1151, Optical Information Processing Systems and Architectures, (5 February 1990); doi: 10.1117/12.962232; https://doi.org/10.1117/12.962232