We propose a compact directional optical receiver for free-space communications, where a microlens array and micro-optic structures selectively couple light from a narrow incidence angle into a thin slab waveguide and then to an edge-mounted detector. A small lateral translation of the lenslet array controls the coupled input angle, enabling the receiver to select the transmitter source direction. We present the optical design and simulation of a 10mm x 10mm aperture receiver using a 30μm thick silicon waveguide able to couple up to 2.5Gbps modulated input to a 10mm x 30μm wide detector.
Re-entry bodies are subject to extreme conditions, among them the rigorous shock, vibration, and loading characteristics
that can often induce noise or loss of measurement. Restrictions by the Department of Energy on spark sources within a
sealed body require the exclusive use of fiber optics for sensing. A joint effort between Los Alamos National Laboratory
and Lambda Instruments has developed and evaluated a white light interferometric fiber sensor to address these concerns
while measuring displacements between high explosive components in potential flight applications. The sensor offers
advantages with electro-magnetic immunity, non-contact sensing elements, and high sensitivity to movement. Gap
values are calculated from the extrema of the sinusoidal wavelength pattern created by the Fabry-Perot cavity between
the lens and explosive surface, collected by an optical spectrum analyzer and interpreted by an external computer. This
paper focuses on the interferometric concept and experimental data received from the unit in real-time during centrifuge
tests. Results from single and multimode versions are presented and reported in their effectiveness for 0-2 millimeter
measurements.
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