Yamal-401
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The Yamal-401 geostationary communications satellite was launched on December 15, 2014 to an orbital slot of 90°E. It carries 17 C-band and 36 Ku-band transponders to provide communications coverage for Russia. Key specifications include a transmitter output power of 90W for C-band and 150W for Ku-band, with payload power of 10,600W. The satellite is operated by Gazprom Space Systems and provides precision station keeping and orientation within 0.1 degrees.
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Yamal-402
The Yamal-402 geostationary communications satellite was launched on December 8, 2012 by Gazprom Space Systems to provide Ku-band satellite communications services from 55°E orbital slot. It has 46 transponders across multiple beams with transmission power of 150W and accuracy of 0.1 degrees for station keeping and satellite orientation. The satellite provides coverage of Russia, Europe, and northern regions with various transponder bandwidths and polarization configurations.
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Optical Inter-Satellite Links for CubeSat Satellites
The materials belong to the article in Journal of Radioelectronics (https://www.researchgate.net/publication/325756066_OPTICAL_INTER-SATELLITE_LINK_IN_COMPARISON_WITH_RF_CASE_IN_CUBESAT_SYSTEM) and were presented in the II SCIENTIFIC FORUM OF TELECOMMUNICATIONS: THEORY AND TECHNOLOGY TTT-2017 (Kazan, November 20 - 24, 2017).
20GHz DQPSK Optical Modulator Electrical Bias Optimiser
1. The document describes a self-adjusting optical serrodyne loop frequency shifter that uses a DQPSK modulator to generate a spectrum of optical carrier frequencies for testing high data rate transmission.
2. A biasing technique was studied that uses asymmetric dither signals to monitor and optimize the bias points of the DQPSK modulator in order to produce a clean optical frequency shift. This technique was simulated and a system was designed using an FPGA to implement it.
3. Testing showed that optimizing the bias points reduced output power and suppressed unwanted frequencies when no RF was applied, and produced a single sideband shift when RF was on, enabling generation of multiple optical subcarriers.
Behalf Of Pamela Collaboration
The document summarizes the PAMELA experiment's silicon tracker, including its design, components, performance, and preliminary analysis of flight data. The tracker uses silicon microstrip sensors and VA1 readout chips to precisely measure particle trajectories in the magnetic spectrometer. Initial flight data shows the tracker is working as expected, with nominal noise levels, signal-to-noise ratios, and spatial resolution allowing for momentum and charge identification of cosmic rays.
Towards Terabit per Second Optical Networking
This document summarizes the work being done by CPqD towards developing terabit optical networks. It discusses:
1. The evolution of optical transmission rates from 100G to 400G and 1T using technologies like coherent transmission, higher order modulation formats, and carrier aggregation.
2. Advances in optical networking components like amplifiers, ROADMs, and integrated photonics to enable network control and monitoring.
3. Microelectronic developments like high-speed DACs and ASIC DSPs to support coherent transmission systems.
4. Experimental demonstrations and field trials of terabit superchannels using techniques like CO-OFDM, carrier aggregation, and flexible transmitters.
COHERENT OPTICAL TRANSCEIVERS – CURRENT CAPABILITIES AND FUTURE POSSIBILITIES
COHERENT OPTICAL TRANSCEIVERS – CURRENT CAPABILITIES AND FUTURE POSSIBILITIES
Thomas Weible
Flexoptix
1993 prl quantum optical cloning amp_grangier
This document summarizes an experiment that demonstrates quantum optical cloning using a type-II pulsed optical parametric amplifier. The experiment shows that the amplifier is able to duplicate the quadrature component of the input signal that it amplifies, effectively cloning that component onto two output beams. The experiment also shows that the amplifier can overcome noise introduced by downstream losses while preserving the signal-to-noise ratio of the input beam. The setup uses a potassium titanyl phosphate crystal pumped by a frequency-doubled laser to amplify an input beam. Photodetectors measure the noise and signal levels of the two output beams, which are found to be clones in the amplified quadrature.
Reference Signal for LTE-Advanced
This document discusses reference signals used in LTE-Advanced, including:
1. Downlink reference signals such as cell-specific reference signals, MBSFN reference signals, UE-specific reference signals, positioning reference signals, and CSI reference signals.
2. Uplink reference signals such as demodulation reference signals and sounding reference signals.
3. Details are provided on the generation and mapping of various reference signals, including cell-specific reference signals, MBSFN reference signals, UE-specific reference signals, positioning reference signals, and CSI reference signals.
Similar to Yamal-401 (14)
Optical Inter-Satellite Links for CubeSat Satellites
Optical Inter-Satellite Links for CubeSat Satellites
20GHz DQPSK Optical Modulator Electrical Bias Optimiser
20GHz DQPSK Optical Modulator Electrical Bias Optimiser
COHERENT OPTICAL TRANSCEIVERS – CURRENT CAPABILITIES AND FUTURE POSSIBILITIES
COHERENT OPTICAL TRANSCEIVERS – CURRENT CAPABILITIES AND FUTURE POSSIBILITIES
Yamal-401
- 1. YAMAL-401GEOSTATIONARY COMMUNICATIONS SATELLITE The Satellite was Launched December 15, 2014 Orbital slot 90°E Payload Power 10 600 W Frequency Band C, Ku Number of Transponders and Bandwidth 17x72 MHz (C), 18x72 MHz (Ku), 18x36 MHz (Ku) Transmitter Output Power 90 W (C), 150 W (Ku) Polarization Circular (C), Linear (Ku) Station Keeping Accuracy 0.1° Satellite Axes Orientation Accuracy 0.1° www.gazprom-spacesystems.ru 90E
- 2. NORTHERN BEAM Ku-band Linear Polarization 18 transponders x 72 MHz Russia, 141112, Moscow region, Schelkovo, Moscow street, bld. 77B info@gazprom-spacesystems.ru www.gazprom-spacesystems.ru RUSSIAN BEAM Ku-band Linear Polarization 18 transponders x 36 MHz RUSSIAN BEAM С-band Circular Polarization 17 transponders x 72 MHz EIRP Dish size 49 1,8 м 48 2,4 м 47 2,4 м 46 3,7м 45 3,7 м EIRP Dish size 53 0,9 м 52 1,2 м 51 1,2 м 50 1,2 м 49 1,2 м 48 1,8 м 47 1,8 м 46 1,8 м 45 2,4 м EIRP Dish size 53 0,9 м 52 0,9 м 51 1,2 м Antenna diameters are indicated for receipt of a TV package in staurated transponders