A compact and modular optical system that employs gradient-refractive-
index rod lenses to image arrays of Lambertian sources is characterize
d both experimentally and by ray-tracing simulations. A hybrid optical
system that incorporates additional microlens arrays to reduce transm
ittance losses and aberrations is also modeled, and the two systems ar
e compared. (C) 1997 Optical Society of America.