Retromodulator for Optical Tagging for LEO Consumables

Abstract

Abstract-In this paper, we report the results of a recent demonstration in which a Multiple Quantum Well retromodulator array was used as a low power, lightweight means to provide optical tagging of a remotely located object. A laser diode integrated on a tracker/pointing system scanned without cueing for a modulated retroreflected beam. The retroreflected energy was received and the embedded code demodulated for tagging identification. Ranges were on the order of 40 meters using an array of 1/2 cm MQW devices. Data were transferred at a rate of one mega chip per second over the link. Device power requirements were on the order of several milliwatts.

Free space optical transmission of FM audio/video signals using InGaAs modulating retro-reflectors

“…There are numerous applications where it would be beneficial to reduce the payload requirements for on-board com munications, and the Naval Research Laboratory has developed coupled-well InGaAs modulating retro-reflectors for this purpose [1]. These have been success fully employed to transmit digital video signals in asymmetric links [2].…”

Modulating retroreflector implementation of mil-std 1553 protocol with free-space optics

“…Since 1998 the Naval Research Laboratory has investigated modulating retroreflectors based on semiconductor multiple quantum well (MQW) based electro-optic modulators [ 3 ]. These types of modulators have the advantage of having very high intrinsic switching times (greater than 10 GHz), and in practice are limited in their modulation rate only by RC time.…”