Optical intersatellite links - Application to commercial satellite communications

Paul, Dilip K.; Faris, F.; Garlow, R.; Inukai, T.; Pontano, B. A.; Razdan, R.; Ganz, Aura; Caudill, L. O.

doi:10.2514/6.1992-1837

Cited by 15 publications

(3 citation statements)

References 4 publications

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“…?pHQ[(C1XHTXHV)+C2XHE]XflL (7) ?ip The program COMP-REL has a stored database of these stress factors9 and queries the user interactively to determine which of these values are needed to calculate reliability of a particular device. Default values have also been stored to match with the "Parts Count" method.…”

Section: Reliability Programsmentioning

confidence: 99%

<title>Reliable optical baseband processor for advanced communications satellites</title>

1996

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ABSTRACIThis paper describes the development of a prototype onboard baseband switch for use in advanced satcom systems. The modular switch is designed to accommodate different types of satcom services and/or carriers. The selected architecture utilizes a high-speed fiber optic ring for the I/O interconnections of the satcom channels handling both circuit-and packet-type traffic.Whereas, an optical star topology is used for onboard clock distribution. The onboard baseband switch design makes maximum use of photonics, VLSI, and standard cell/gate array technologies to implement the hardware/firmware required for a power-efficient, lightweight, reliable payload with a flexible switch architecture. Relevant optical technologies, active and passive components, and systems considerations to ensure a high reliability operation are discussed. To assess its viability in potential commercial applications, the state-of-the-art of photonics technology and future prospects for economical large capacity multi-channel services is briefly reviewed.

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Section: Reliability Programsmentioning

confidence: 99%

<title>Reliable optical baseband processor for advanced communications satellites</title>

1996

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“…In this method, the information is interleaved in such a way that the burst error is scattered on a number of code words so that the error per code word becomes short and independent. Paul et al [6], [7] derive that for some practical communication systems where the high data rate stream is formed by multiplexing several low data rate channels, the preferred approach is to apply FEC to the individual channels using convolution coding and Viterbi decoding algorithms and to implement interleaving for burst-error correction. It is important to remember that coding techniques may yield lower performance compared to uncoded ones.…”

Section: Coding Techniquementioning

confidence: 99%

Laser satellite communication network-vibration effect and possible solutions

1997

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A number of serious consortiums develop satellite communication networks. The objective of these communication projects is to service personal communication users almost everywhere on earth. The intersatellite links in those projects use microwave radiation as the carrier. Free-space optical communication between satellites networked together can make possible high-speed communication between different places on earth. Some advantages of an optical communication system over a microwave communication system in free space are 1) smaller size and weight, 2) less transmitter power, 3) larger bandwidth, and 4) higher immunity to interference. The pointing from one satellite to another is a complicated problem due to the large distance between the satellite, the narrow beam divergence angle, and vibration of the pointing system. Such vibration of the transmitted beam in the receiver plane decreases the average received signal, which increases the bit error rate. In this paper, we review 1) the present status of satellite networks, 2) developing efforts of optical satellite communication around the world, 3) performance results of vibration effects on different kinds of optical communication satellite networks, and 4) seven approaches to overcome the problems caused by transmitter pointing vibration.

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“…Laser links are characterized by absence of channel contention, low probability of detection and interception, and resistance to jamming [1] - [3]. However, an optical beam with a plane wave front at the transmitter may be exposed to adverse effects of fog, rain, snow, or turbulence, while propagating to the receiver.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of the effects of atmospheric turbulence on a 29-km free-space laser communication link

et al. 2011

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Laser beams propagating through the atmosphere are affected by optical turbulence, whose static and dynamic properties can be characterized by spatial and temporal fields of the refractive index. The resulting wave front distortions lead to performance degradation in the form of reduced signal power and increased bit-error-rates (BER), even in short links; however, it is impossible to obtain closed-form solutions for instantaneous realizations of these distortions and all the subsequent events. Instead, the statistical properties of the refractive index fluctuations can be studied using one of the well-known spectral models and extended further into the scintillation analysis and analysis of communication performance. From a practical stand point, it would be very advantageous to relate the expected system performance to specific factors responsible for wave front distortions, which are typically linked to some weather variables, such as the air temperature, pressure, wind speed, etc. In this paper, we present the results of a detailed experimental study, where some of these relationships are mathematically justified based on the tests conducted over a period of several months. The measurement data was obtained using a 29-km free-space laser communication link established between two fixedpoint terminals and operating at a wavelength of 1550 nm.

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Optical intersatellite links - Application to commercial satellite communications

Cited by 15 publications

References 4 publications

<title>Reliable optical baseband processor for advanced communications satellites</title>

<title>Reliable optical baseband processor for advanced communications satellites</title>

Laser satellite communication network-vibration effect and possible solutions

Experimental analysis of the effects of atmospheric turbulence on a 29-km free-space laser communication link

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