A folded structured light generator is presented. This spot generator is to be used in a modulator-based free-space optical interconnect. Three cascaded diffractive optical elements produce 4 × 8 clusters on an 800 μm × 1600 μm pitch, in which each cluster is a 4 × 4 array of 13.1-μm-radius spots on a 90-μm pitch. The folded configuration is more compact than an existing linear spot-array generator and replaces 14 optical surfaces with eight surfaces. Details of the optical design, sensitivity analysis, alignment techniques, assembly, and test results are presented.
© 2003 Optical Society of America
(050.1970) Diffraction and gratings : Diffractive optics
(200.2610) Optics in computing : Free-space digital optics
(220.4830) Optical design and fabrication : Systems design
(230.1150) Optical devices : All-optical devices
Frédéric Thomas-Dupuis, Marc Châteauneuf, and Andrew G. Kirk, "Design, Implementation, and Characterization of a Folded Spot-Array Generator for a Modulator-Based Free-Space Optical Interconnect," Appl. Opt. 42, 5399-5406 (2003)