A Pilot-Carrier Coherent LEO-to-Ground Downlink System Using an Optical Injection Phase Lock Loop (OIPLL) Technique

Shoji, Yozo; Fice, Martyn J.; Takayama, Yoshihisa; Seeds, A.J.

doi:10.1109/jlt.2012.2204037

Cited by 33 publications

(17 citation statements)

References 22 publications

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“…A combination of OPLL technique with an OIL technique i.e., use of an optical injection phase-lock loop (OIPLL) technique, which is also used to lock the frequency and phase under Doppler shift conditions. A pilot-carrier coherent LEO-to-ground downlink using OIPLL Doppler frequency shift is demonstrated in [184].The effect of Doppler shift in homodyne inter-satellite communication link is analyzed in [185]. Optimum bandwidth of the optical filter is determined for the entire range of frequency shifts to improve the system performance.…”

Section: B Inter-satellite Linksmentioning

confidence: 99%

Optical Communication in Space: Challenges and Mitigation Techniques

Kaushal

Kaddoum

2017

IEEE Commun. Surv. Tutorials

1,281

721

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Abstract-In recent years, free space optical (FSO) communication has gained significant importance owing to its unique features: large bandwidth, license free spectrum, high data rate, easy and quick deployability, less power and low mass requirements. FSO communication uses optical carrier in the near infrared (IR) band to establish either terrestrial links within the Earth's atmosphere or inter-satellite/deep space links or ground-to-satellite/satellite-to-ground links. It also finds its applications in remote sensing, radio astronomy, military, disaster recovery, last mile access, backhaul for wireless cellular networks and many more. However, despite of great potential of FSO communication, its performance is limited by the adverse effects (viz., absorption, scattering and turbulence) of the atmospheric channel. Out of these three effects, the atmospheric turbulence is a major challenge that may lead to serious degradation in the bit error rate (BER) performance of the system and make the communication link infeasible. This paper presents a comprehensive survey on various challenges faced by FSO communication system for ground-to-satellite/satellite-to-ground and inter-satellite links. It also provide details of various performance mitigation techniques in order to have high link availability and reliability. The first part of the paper will focus on various types of impairments that pose a serious challenge to the performance of optical communication system for ground-to-satellite/satellite-to-ground and inter-satellite links. The latter part of the paper will provide the reader with an exhaustive review of various techniques both at physical layer as well as at the other layers (link, network or transport layer) to combat the adverse effects of the atmosphere. It also uniquely presents a recently developed technique using orbital angular momentum for utilizing the high capacity advantage of optical carrier in case of space-based and near-Earth optical communication links. This survey provides the reader with comprehensive details on the use of space-based optical backhaul links in order to provide high capacity and low cost backhaul solutions.

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Section: B Inter-satellite Linksmentioning

confidence: 99%

Optical Communication in Space: Challenges and Mitigation Techniques

Kaushal

Kaddoum

2017

IEEE Commun. Surv. Tutorials

1,281

721

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“…A pilot-bearer coherent LEO to ground downlink utilizing the OIPLL Doppler recurrence move is shown in [30]. The impact of a Doppler move in homodyne inter-satellite communication link is investigated in [31]. Ideal transfer speed of the optical filter is resolved for the whole length of recurrence movements to improve the framework execution.…”

Section: Doppler Shiftmentioning

confidence: 99%

A Review on Inter-Satellite Links Free Space Optical Communication

Chauhan¹

2020

IJST

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Objectives: The need for constricting, lightweight, low-power electronics-aggravated by the thriving demand for large data flow rate and bandwidth is urging the use of optical technologies in defense and space. Free space optical (FSO) communication links have promising eminence over microwave communication links with high speed, low weight, and increased security so that they can be boarded conveniently on the satellite. Methods/findings: The advancement of the optical components and systems has made it very predominant along with its acceptability in space and defense. Yet a couple of significant components to be dealt with are tracking problems with misalignment of the transmitter and receiver apertures and the progressions because of barometrical conditions. Efficiency of the FSO communication system is seriously rotted due to the angle of arrival (AoA) variance and including error pointing. The optical transmitter can be perfectly coordinated with the receiver by utilizing the pointing, acquisition, and tracking (PAT). However, this method is to be carried out under the airborne platform with required restrictions namely size, weight, and power. Application: An overview of promising inter-satellite applications with the challenges have been discussed which sway the performance of the system and make the communication link unattainable. The FSO communication possesses an advantage over two existing technologies optical fiber communication and wireless communication. Hence, the significant use of FSO is intersatellite optical wireless communication (Is OWC) links, which will be deployed in the future in space.

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“…Both satellite-to-ground links and inter-satellite transmissions undergo Doppler effects due to the relative motion between the emitter and the receiver [9] [10]. This results in a frequency shift of the incoming signal with respect to the local oscillator (LO) frequency amplified by the frequency instability of both lasers, which disturbs carrier synchronization.…”

Section: Introductionmentioning

confidence: 99%

“…Compared to optical PLL, DPLL have the advantage of flexibility and ease of reconfigurability. As the initial frequency mismatch in space-ground FSO links may be of the order of several GHz [9], we assume hereafter that the major part of this offset is pre-compensated with a coarse frequency estimator, based for example on ephemerides, which is out of the scope of the present study. Our system then acquires and tracks the residual shift with the objective of maintaining accurate frequency and phase synchronization during the pass of the satellite.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Optics Assisted Space-Ground Coherent Optical Links: Ground Receiver Performance with Digital Phase-Locked Loop

Paillier

Conan

Bidan

et al. 2019

2019 IEEE International Conference on Space Optical Systems and Applications (ICSOS)

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In the framework of optical high data rate satelliteto-ground links, we investigate the performance of a coherent receiver which combines an adaptive optics system and a digital carrier synchronization technique. We propose a digital carrier synchronization system based on a phase-locked loop and use end-to-end simulations to characterize the impact of the atmospheric turbulence in the case of a representative low Earth orbit satellite-to-ground transmission link. The results show that classical digital phase-locked loop techniques can be a reliable solution to accurately compensate for the Doppler frequency shift between the incoming signal and the local oscillator at the ground station, in the presence of a preliminary coarse frequency estimation. Adaptive optics compensation enables the loop to lock after a few milliseconds and to accurately track the phase fluctuations. The bit-error-rate performance is not degraded by the digital loop but suffers from the residual signal amplitude fluctuations.Index Terms-Coherent receiver, digital phase-locked loop, adaptive optics, carrier synchronization, LEO, downlink.L. Paillier, J-M. Conan and N. Védrenne are with ONERA, DOTA, Paris

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A Pilot-Carrier Coherent LEO-to-Ground Downlink System Using an Optical Injection Phase Lock Loop (OIPLL) Technique

Cited by 33 publications

References 22 publications

Optical Communication in Space: Challenges and Mitigation Techniques

Optical Communication in Space: Challenges and Mitigation Techniques

A Review on Inter-Satellite Links Free Space Optical Communication

Adaptive Optics Assisted Space-Ground Coherent Optical Links: Ground Receiver Performance with Digital Phase-Locked Loop

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