Optical Satellite Communications

Hemmati, Hamid; Caplan, D.O.

doi:10.1016/b978-0-12-396960-6.00004-3

Cited by 24 publications

(18 citation statements)

References 77 publications

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“…Fortunately, communication performance is relatively insensitive to burst-droop waveform distortion at high error rates as shown in the blue-triangle curve of Figure 15 (right), which shows the calculated penalty of the measured waveforms relative to the ideal square burst shape. As you can see for the worst- ' f4' 10 12 14 16 Received Power (dB-photons/bit) case (lowest) duty cycle of -16 dB, the burst-droop penalty results in a relatively small ~0.1 dB penalty, which is consistent with both measurements (at 10 -2 BER) and theoretical calculations. The other high-power impairment is due to nonlinear (NL) self phase modulation (SPM) induced spectral broadening, which primarily shifts useful signal energy outside of the (nearly-matched) RX optical filter pass band.…”

Section: Impairments and Communication Performancesupporting

confidence: 82%

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Multi-rate DPSK optical transceivers for free-space applications

et al. 2014

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We describe a flexible high-sensitivity laser communication transceiver design that can significantly benefit performance and cost of NASA's satellite-based Laser Communications Relay Demonstration. Optical communications using differential phase shift keying, widely deployed for use in long-haul fiber-optic networks, is well known for its superior sensitivity and link performance over on-off keying, while maintaining a relatively straightforward design. However, unlike fiber-optic links, free-space applications often require operation over a wide dynamic range of power due to variations in link distance and channel conditions, which can include rapid kHz-class fading when operating through the turbulent atmosphere. Here we discuss the implementation of a robust, near-quantum-limited multi-rate DPSK transceiver, co-located transmitter and receiver subsystems that can operate efficiently over the highly-variable freespace channel. Key performance features will be presented on the master oscillator power amplifier (MOPA) based TX, including a wavelength-stabilized master laser, high-extinction-ratio burst-mode modulator, and 0.5 W single polarization power amplifier, as well as low-noise optically preamplified DSPK receiver and built-in test capabilities.

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Section: Impairments and Communication Performancesupporting

confidence: 82%

“…DPSK is considered an attractive format for both high-rate fiber and free-space optical communication links [6][7][8][9][10] . For power-starved free-space applications, multi-rate capability provides valuable architectural flexibility by extending the operational range of receiver (RX) power levels.…”

Section: Introductionmentioning

confidence: 99%

Multi-rate DPSK optical transceivers for free-space applications

et al. 2014

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“…Free space optical (FSO) communication links can provide high data rates by exploiting the unregulated and nearly unlimited amount of bandwidth available in the infrared portion of the electromagnetic spectrum [4,5]. The SWaP of space borne lasercom downlinks is driven in a large part by the power-aperture product required to close the link [6]. For many years the effort towards reducing the magnitude of this requirement focused on creating receivers with excellent sensitivity [5,7].…”

Section: Introductionmentioning

confidence: 99%

Multi-aperture digital coherent combining for next-generation optical communication receivers

Yarnall

Geisler

Stevens

et al. 2015

2015 IEEE International Conference on Space Optical Systems and Applications (ICSOS)

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Space terminals for free-space optical communication systems are under constant pressure to reduce their size, weight, and power profiles. Ground terminals with large collection areas are costly, but provide a means to reduce the aperture-power product on a space platform required to close a given link. We present a ground terminal receiver architecture in which many small apertures are coherently combined while maintaining excellent receiver sensitivity. This is accomplished via coherent detection behind each aperture followed by digitization. The digitized signals are then combined in a digital signal processing chain. Experimental results demonstrate lossless coherent combining of four lasercom signals, down to power levels below -10 dB photons-per-bit per aperture.

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“…Free space optical (FSO) communication links can provide high data rates by exploiting the unregulated and nearly unlimited amount of bandwidth available in the infrared portion of the electromagnetic spectrum [4,5]. The SWaP of spaceborne lasercom downlink terminals is driven in a large part by the power-aperture product required to close the link [6]. For many years, SWaP reduction efforts focused on creating ground receivers with excellent sensitivity [5,7].…”

Section: Introductionmentioning

confidence: 99%

Multi-aperture digital coherent combining for free-space optical communication receivers

et al. 2016

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Space-to-ground optical communication systems can benefit from reducing the size, weight, and power profiles of space terminals. One way of reducing the required power-aperture product on a space platform is to implement effective, but costly, single-aperture ground terminals with large collection areas. In contrast, we present a ground terminal receiver architecture in which many small less-expensive apertures are efficiently combined to create a large effective aperture while maintaining excellent receiver sensitivity. This is accomplished via coherent detection behind each aperture followed by digitization. The digitized signals are then combined in a digital signal processing chain. Experimental results demonstrate lossless coherent combining of four lasercom signals, at power levels below 0.1 photons/bit/aperture.

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Optical Satellite Communications

Cited by 24 publications

References 77 publications

Multi-rate DPSK optical transceivers for free-space applications

Multi-rate DPSK optical transceivers for free-space applications

Multi-aperture digital coherent combining for next-generation optical communication receivers

Multi-aperture digital coherent combining for free-space optical communication receivers

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