Hybrid planar lightwave circuits for defense and aerospace applications
2010
We present innovations in Planar Lightwave Circuits (PLCs) that make them ideally suited for use in advanced defense
and aerospace applications. We discuss PLCs that contain no micro-optic components, no moving parts, pose no spark
or fire hazard, are extremely small and lightweight, and are capable of transporting and processing a range of optical
signals with exceptionally high performance. This PLC platform is designed for on-chip integration of active
components such as lasers and detectors, along with transimpedance amplifiers and other electronics. These active
components are hybridly integrated with our silica-on-silicon PLCs using fully-automated robotics and image
recognition technology. This PLC approach has been successfully applied to the design and fabrication of multi-channel
transceivers for aerospace applications. The chips contain hybrid DFB lasers and high-efficiency detectors, each capable
of running over 10 Gb/s, with mixed digital and analog traffic multiplexed to a single optical fiber. This highlyintegrated
functionality is combined onto a silicon chip smaller than 4 x 10 mm, weighing < 5 grams. These chip-based
transceivers have been measured to withstand harsh g-forces, including sinusoidal vibrations with amplitude of 20 g
acceleration, followed by mechanical shock of 500 g acceleration. The components operate over a wide range of
temperatures, with no device failures after extreme temperature cycling through a range of > 125 degC, and more than
2,000 hours operating at 95 degC ambient air temperature. We believe that these recent advancements in planar
lightwave circuits are poised to revolutionize optical communications and interconnects in the aerospace and defense
industries.
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