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Optical Intersatellite Links and On-Board Techniques, IEE Colloquium on

Date 12-12 Jan. 1990

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Displaying Results 1 - 15 of 15
  • Diode pumped Nd:Host laser transmitter for intersatellite optical communications

    Publication Year: 1990, Page(s):5/1 - 5/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (164 KB)

    A transmitter laser breadboard suitable for a coherent space communication system is under development. The paper reflects some design considerations and preliminary experimental results. A typical mission scenario is a communication return link between a LEO (low Earth orbit) and a GEO (geostationary Earth orbit) satellite at 45000 km distance, 500 Mb/s data rate, and 10 E-7 bit error rate. This,... View full abstract»

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  • IEE Colloquium on `Optical Intersatellite Links and On-Board Techniques' (Digest No.8)

    Publication Year: 1990
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (52 KB)

    The following topics were dealt with: InGaAs/InP quadrant PIN photodetector for pointing, acquisition, and tracking; coherent addition of semiconductor laser beams; diode pumped Nd:YAG laser transmitter for intersatellite optical communications; optical intersatellite link (ISL) transmitter; coherent optical antennas; laser tracking noise angle; piezoelectric scanning; optical multiple access (OMA... View full abstract»

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  • A 560 Mbit/s FSK modulation/heterodyne detection free space optical link

    Publication Year: 1990, Page(s):14/1 - 14/8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (344 KB)

    Reviews the performance of heterodyne and homodyne coherent detection techniques and their advantages over a direct detection system. Theoretical analysis and factors affecting the design of a frequency shift keyed (FSK) modulation/heterodyne detection optical link using a nonsynchronous dual filter demodulation system suitable for intersatellite link (ISL) use is discussed. The design of the vari... View full abstract»

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  • Coherent optical techniques in antenna beamforming for satellite communications

    Publication Year: 1990, Page(s):17/1 - 17/4
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    In order to meet the needs of business telecommunications traffic, satellite antennas will be required which can form multiple spot beams and permit extensive frequency reuse, implying stringent requirements with respect to control of beam shape and sidelobe suppression, combined in many cases with rapid reconfiguration and beam hopping or scanning. It is likely that the extensive use of optical t... View full abstract»

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  • An ultra-high-sensitivity direct detection optical receiver for intersatellite communications

    Publication Year: 1990, Page(s):13/1 - 13/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (204 KB)

    Describes such a receiver developed as part of the ESA SILEX project. The system specified uses direct detection at wavelengths in the 850 nm band. Modulation at data rates from 15 to 120 Mb/s using the QPPM format is specified. The receiver described shows frequency response and signal-to-noise ratio performance enabling a bit error rate of 10-6 to be achieved at all bit rates at input... View full abstract»

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  • Piezoelectric scanning mechanisms

    Publication Year: 1990, Page(s):10/1 - 10/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB)

    The application of piezoelectrically driven scanners to small angle pointing requirements is considered. The basic piezoelectric mechanisms are discussed, the characteristics of a number of devices built by the Sensors and Instrumentation Division of the Marconi Research Centre are briefly described, and outline designs suitable for the fine pointing mechanism in the acquisition and tracking syste... View full abstract»

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  • The design of a high sensitivity InGaAs/InP quadrant PIN photodetector for pointing, acquisition and tracking applications in space

    Publication Year: 1990, Page(s):3/1 - 3/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (168 KB)

    One of the key components is the photodetector for positioning, acquisition and tracking. A figure of merit for performance accuracy is the minimum optical power required for a given noise equivalent angle (NEA). Based on the InGaAs/InP PIN structure, the design study examines how the detector parameters can be optimised to improve the system performance accuracy. The choice of layer structure and... View full abstract»

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  • Coherent optical system for inter-satellite communications

    Publication Year: 1990, Page(s):15/1 - 15/7
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    Concentrate on heterodyne detection at 1.5 μm (wavelength) using semiconductor lasers. A coherent system breadboard has been realised and tested to demonstrate and assess the capability of this technology for optical intersatellite links. A sensitivity of -46.5 dB has been achieved which is 11.4 dB from the shot noise limit. The system penalties have been evaluated and used to derive a link bud... View full abstract»

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  • Link acquisition for the optical multiple access system

    Publication Year: 1990, Page(s):11/1 - 11/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (128 KB)

    Optical Multiple Access (OMA) is an optical intersatellite link (ISL) system for bidirectional low data rate communications between multiple low Earth orbiting (LEO) `users' and a single geostationary (GEO) data relay satellite. A summary of the communication system parameters is shown. The status of this project is phase A with a current program to demonstrate the pointing, acquisition, and track... View full abstract»

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  • Coherent addition of semiconductor laser beams

    Publication Year: 1990
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (80 KB)

    In order to utilise semiconductor laser beams as carriers in inter-satellite communication links single spatial and temporal mode powers in excess of that available from a single laser would be desirable. A beamforming technique is described by which individual lasers (or a laser array) may be coherently combined using a binary phase diffraction grating View full abstract»

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  • Optical signal distribution for a satellite phased array

    Publication Year: 1990, Page(s):16/1 - 16/5
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (252 KB)

    Describes an optical signal distribution and interface system. The system has been built to determine the feasibility of this approach for use on an advanced synthetic aperture radar (SAR) Earth resourcing satellite. The satellite will utilize an electronically steered phased array antenna with a large number of active remote transmit-receive (T/R) elements. Transmit signal distribution is at 5 GH... View full abstract»

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  • High-precision tracking: an essential component of the optical multiple access (OMA) system

    Publication Year: 1990, Page(s):12/1 - 12/7
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (320 KB)

    Essential components of any optical inter-satellite link (ISL) are pointing, acquisition and tracking (PAT) of the optical beams. The authors examines the components which are needed for high-precision tracking and presents the design and simulated results of the OMA tracking subsystem. Components have been studied, analysed, designed and modelled in two simulations. The first PC based simulation ... View full abstract»

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  • Design study for an optical intersatellite link transmitter

    Publication Year: 1990, Page(s):6/1 - 6/3
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (156 KB)

    The authors have shown an interesting application of waveguide modulators in a spaceborne laser transmitter in the attempt to minimise the electrical power consumption. To obtain 50-100 mW of output power a basic configuration would consist of a 200 mW Nd:host oscillator plus a waveguide modulator. In order to achieve an output power of 500-600 mW an optical amplifier will be needed. Bulk modulato... View full abstract»

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  • Design considerations for coherent optical antennas

    Publication Year: 1990, Page(s):8/1 - 8/4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (112 KB)

    Examines some design considerations for coherent optical antennas and in particular the effects of the primary or third-order aberrations on relative mixing efficiency. When designing an optical subsystem for a coherent intersatellite link (ISL) the designer is concerned, principally, with optimising the nominal design performance so that the wavefront errors are minimised and remain so during the... View full abstract»

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  • Experimental assessment of laser tracking noise angle

    Publication Year: 1990, Page(s):9/1 - 9/8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    Because of the very high antenna gains on which free space laser communication depends, beamwidths are very narrow of the order of 1 arcsecond (5 microradians), and very high pointing precision is required if the link error rates are to be maintained within the stringent levels required for a commercial communications system. Studies had been carried out at Marconi comparing the so-called `stabili... View full abstract»

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