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Scale analysis of equatorial plasma irregularities derived from Swarm constellation
Xiong, Chao,Stolle, Claudia,Lü,hr, Hermann,Park, Jaeheung,Fejer, Bela G.,Kervalishvili, Guram N. Springer (Biomed Central Ltd.) 2016 Earth, Planets and Space Vol.68 No.1
<P>In this study, we investigated the scale sizes of equatorial plasma irregularities (EPIs) using measurements from the Swarm satellites during its early mission and final constellation phases. We found that with longitudinal separation between Swarm satellites larger than 0.4 degrees, no significant correlation was found any more. This result suggests that EPI structures include plasma density scale sizes less than 44 km in the zonal direction. During the Swarm earlier mission phase, clearly better EPI correlations are obtained in the northern hemisphere, implying more fragmented irregularities in the southern hemisphere where the ambient magnetic field is low. The previously reported inverted-C shell structure of EPIs is generally confirmed by the Swarm observations in the northern hemisphere, but with various tilt angles. From the Swarm spacecrafts with zonal separations of about 150 km, we conclude that larger zonal scale sizes of irregularities exist during the early evening hours (around 1900 LT).</P>
Reconfigurable all-optical code translation in spectrally phase-coded O-CDMA
Jiang, Z.,Seo, D.S.,Leaird, D.E.,Roussev, R.V.,Langrock, C.,Fejer, M.M.,Weiner, A.M. IEEE 2005 Journal of Lightwave Technology Vol.23 No.6
Reconfigurable all-optical code translation are demonstrated in a spectrally phase-coded optical-code-division multiple-access (O-CDMA) testbed with an interference user. For both one-stage and two-stage code translations, less than 0.9-dB power penalties are induced at each code translation. Multistage code translations are investigated via simulation and experimental emulation in a loop pulse shaper to show the potential application of the proposed method for up to several tens of code translations.
Four-user 10-Gb/s spectrally phase-coded O-CDMA system operating at /spl sim/30 fJ/bit
Zhi Jiang,Dongsun Seo,Shangda Yang,Leaird, D.E.,Roussev, R.V.,Langrock, C.,Fejer, M.M.,Weiner, A.M. IEEE 2005 Photonics Technology Letters Vol.17 No.3
<P>We demonstrate a four-user 10-Gb/s spectrally phase-coded optical code-division multiple-access system via nonlinear processing with ultralow power (/spl sim/30 fJ/bit). Full interference suppression is achieved in a time-slotted scheme without the need for chip-level coordination and synchronous detection. Performance degradation caused by pulse overlap between users is investigated.</P>