scholarly journals Optical distribution of local oscillators in future telecommunication satellite payloads

2017 ◽  
Author(s):  
Michel Sotom ◽  
Michel Maignan ◽  
Benoît Benazet ◽  
Jacques Berthon
Keyword(s):  
Local Oscillators ◽  
Telecommunication Satellite ◽  
Optical Distribution

Optical distribution of local oscillators for a rotating antenna

2002 ◽  
Author(s):  
M.-B. Bibey ◽  
S. Formont ◽  
F. Deborgies ◽  
C. Moronvalle ◽  
G. Auvray ◽  
...  
Keyword(s):  
Local Oscillators ◽  
Optical Distribution

The radio-engineering complex for determining coordinates of a geostationary telecommunication satellite

2016 ◽  
Vol 22 (3) ◽  
pp. 50-59
Author(s):  
F.I. Bushuev ◽  
◽  
M.P. Kaliuzhnyi ◽  
E.S. Sibiriakova ◽  
A.V. Shulga ◽  
...  
Keyword(s):  
Radio Engineering ◽  
Telecommunication Satellite

scholarly journals Spin Laser Local Oscillators for Homodyne Detection in Coherent Optical Communications

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 573
Author(s):  
Nobuhide Yokota ◽  
Hiroshi Yasaka
Keyword(s):  
Spin Polarization ◽  
Optical Communications ◽  
Injection Locking ◽  
Optical Data ◽  
Cavity Surface ◽  
Orthogonal Polarization ◽  
Linear Birefringence ◽  
Polarization Modulation ◽  
Homodyne Detection ◽  
Local Oscillators

We numerically investigate spin-controlled vertical-cavity surface-emitting lasers (spin-VCSELs) for local oscillators, which are based on an injection locking technique used in coherent optical communications. Under the spin polarization modulation of an injection-locked spin-VCSEL, frequency-shifted and phase-correlated optical sidebands are generated with an orthogonal polarization against the injection light, and one of the sidebands is resonantly enhanced due to the linear birefringence in the spin-VCSEL. We determine that the peak strength and peak frequency in the spin polarization modulation sensitivity of the injection-locked spin-VCSEL depend on detuning frequency and injection ratio conditions. As a proof of concept, 25-Gbaud and 16-ary quadrature amplitude modulation optical data signals and a pilot tone are generated, and the pilot tone is used for the injection locking of a spin-VCSEL. An orthogonally-polarized modulation sideband generated from the injection-locked spin-VCSEL is used as a frequency-shifted local oscillator (LO). We verify that the frequency-shifted LO can be used for the homodyne detection of optical data signals with no degradation. Our findings suggest a novel application of spin-VCSELs for coherent optical communications.

Laser Local Oscillators for Heterodyne Receivers beyond 2 Terahertz

Frequenz ◽  
2008 ◽  
Vol 62 (5-6) ◽  
pp. 111-117 ◽  
Author(s):  
Heinz-Wilhelm Hübers ◽  
Heiko Richter ◽  
Sergey Pavlov ◽  
Alexei Semenov ◽  
Alessandro Tredicucci ◽  
...  
Keyword(s):  
Local Oscillators ◽  
Heterodyne Receivers ◽  
Laser Local Oscillators

Integrated 1.55 μm photomixer local oscillators for heterodyne receivers at mm wavelengths

2004 ◽  
Author(s):  
Peter G. Huggard ◽  
Luis Azcona ◽  
Alexandre Laisne ◽  
Brian N. Ellison ◽  
Pengbo Shen ◽  
...  
Keyword(s):  
Local Oscillators ◽  
Heterodyne Receivers

Rancangan Sistem Pengingat Laporan Iranian Optical Distribution Purpose (ODP)

2019 ◽  
Vol 7 (4) ◽  
pp. 225
Author(s):  
Made Dimas Dwi Sutanegara ◽  
Cokorda Rai Adi Pramartha
Keyword(s):  
Fiber Optic ◽  
Data Access ◽  
Network Services ◽  
Network Data ◽  
Access Management ◽  
Field Staff ◽  
Reminder System ◽  
State Owned Enterprise ◽  
Optical Distribution

PT. Telkom Indonesia is a State-Owned Enterprise (BUMN) that provides the largest telecommunications and network services in Indonesia. Data Access Management (DAMAN) is one of the divisions whose task is to update SISKA data, purify network data, and generate Iranian Optical Distribution Purpose (ODP). ODP functions as a protection or place for fiber optic cables at each Telkom pole. ODP can be viewed through the starclik website, for ODP that is not visible on the platform it could be because full ODP or ODP data is not correct on the server, due to the possibility that the field staff did not report the latest data to the division. So that it requires an ODP reporting reminder system to reduce errors that do not arise from ODP.

scholarly journals Propagating Wave and Irregular Dynamics: Spatiotemporal Patterns of Cholinergic Theta Oscillations in Neocortex In Vitro

2003 ◽  
Vol 90 (1) ◽  
pp. 333-341 ◽  
Author(s):  
Weili Bao ◽  
Jian-Young Wu
Keyword(s):  
Phase Distribution ◽  
Signal To Noise Ratio ◽  
Human Subjects ◽  
Local Oscillator ◽  
Spatiotemporal Patterns ◽  
Spatiotemporal Pattern ◽  
Large Signal ◽  
Local Oscillators ◽  
Theta Oscillation

Neocortical “theta” oscillation (5–12 Hz) has been observed in animals and human subjects but little is known about how the oscillation is organized in the cortical intrinsic networks. Here we use voltage-sensitive dye and optical imaging to study a carbachol/bicuculline induced theta (∼8 Hz) oscillation in rat neocortical slices. The imaging has large signal-to-noise ratio, allowing us to map the phase distribution over the neocortical tissue during the oscillation. The oscillation was organized as spontaneous epochs and each epoch was composed of a “first spike,” a “regular” period (with relatively stable frequency and amplitude), and an “irregular” period (with variable frequency and amplitude) of oscillations. During each cycle of the regular oscillation, one wave of activation propagated horizontally (parallel to the cortical lamina) across the cortical section at a velocity of ∼50 mm/s. Vertically the activity was synchronized through all cortical layers. This pattern of one propagating wave associated with one oscillation cycle was seen during all the regular cycles. The oscillation frequency varied noticeably at two neighboring horizontal locations (330 μm apart), suggesting that the oscillation is locally organized and each local oscillator is about ≤300 μm wide horizontally. During irregular oscillations, the spatiotemporal patterns were complex and sometimes the vertical synchronization decomposed, suggesting a de-coupling among local oscillators. Our data suggested that neocortical theta oscillation is sustained by multiple local oscillators. The coupling regime among the oscillators may determine the spatiotemporal pattern and switching between propagating waves and irregular patterns.

Distributed Josephson junction arrays as local oscillators

1993 ◽  
Vol 3 (1) ◽  
pp. 2303-2306 ◽  
Author(s):  
B. Bi ◽  
S. Han ◽  
J.E. Lukens ◽  
K. Wan
Keyword(s):  
Josephson Junction ◽  
Local Oscillators ◽  
Josephson Junction Arrays ◽  
Junction Arrays
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