Dynamic modeling of Optical Phased Arrays

Smith, I. W.; McKie, A. D. W.; Tremer, M.E.

doi:10.1109/milcom.2008.4753058

Cited by 2 publications

(1 citation statement)

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“…To test the limits of the system, measurements at angular scan rates up to 1 mrad/s were performed at one of the pointing angles. The accuracy of this investigation suffered from the need to capture images for the different beams during different scans combined with the effects of angle-scan-rate-dependent loss for OPA steering [5]. Nevertheless, the results were similar to those for the 0.25 mrad/s measurements: CBC efficiency was consistently slightly higher when tracking a moving remote terminal, although the difference was within measurement uncertainty.…”

Section: Coherent Beam Combining Efficiencymentioning

confidence: 71%

Coherent beam combining and optical space-time division multiple access

Miniscalco

Lane

Fisher

et al. 2010

Free-Space Laser Communications X

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We have developed an approach to multiple-access lasercom that adopts the commercial paradigm of sharing the most expensive terminal resources among all users. Space-time division multiple access (STDMA), analogous to an optical space-time switch, hops the transmit beam and receive direction among multiple users and exchanges data while the beam dwells on a user. A key enabler of STDMA is electronic beam steering using liquid crystal optical phased arrays, which provides fast, precise, and agile beam re-pointing. We have built the first optical STDMA terminal, combining beam hopping between remote terminals with coherent combining of both transmit and receive apertures, which is an effective means for increasing antenna gain in systems for which large aperture components are impractical. Coherent beam combining provided the expected increase in antenna gain, and the terminal was found to re-point the beam among users quickly and precisely enough to suffer only minor throughput degradation. Communications test were performed using 10 Gb/s Ethernet for a single-aperture configuration. Performance is presented as a function of angle scan speed and STDMA dwell time per remote terminal. The results suggest that STDMA is a viable technology for supporting multiple-access space-based laser communication.

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Section: Coherent Beam Combining Efficiencymentioning

confidence: 71%