title: Discrete Fourier transforms by single-mode star networks.
abstract: A single-mode star network, made from polarization-preserving components, can perform the spatial discrete Fourier transform of coherent light patterns presented at the inputs. This can be accomplished with passive components, such as 2 x 2 couplers, and propagation delays. The Hadamard transform can be performed similarly.
authors.forename: M E
authors.initials: ME
authors.lastname: Marhic