BER Performance of an Optically Pre-amplified FSO System Under Turbulence and Pointing Errors With ASE Noise

Saxena, Prakriti; Mathur, Aashish; Bhatnagar, Manav R.

doi:10.1364/jocn.9.000498

Cited by 60 publications

(30 citation statements)

References 27 publications

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“…The analytical results for the considered system with EDFA are obtained for parameters M 1 = 2, E = 4 and y th = 0.5. Note that, in this paper we utilize the same set of parameters for EDFA that were used and validated in [20], [25]. Further, the choice of the AT parameter α i for non-identical links in the rest part of this section can be verified from the AT parameters of the reported results in [39].…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…Here h is Planck's constant, ν is the optical center frequency, G is the amplifier gain, and N sp is spontaneous emission factor [20], [42]. It is assumed that, the optical gain is sufficiently high such that the ASE noise is the dominant source compared with the shot and thermal noise sources at the Rx [20], [22], [25], [42]. Prior to square law detection, the received optical signal with noise is passing through a band-pass filter in order to improve the SNR (i.e., reduce the noise).…”

Section: B Ber Of Rc Over Correlated γ γ At With Edfa Pre-amplifier mentioning

confidence: 99%

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Experimental and Analytical Investigations of an Optically Pre-Amplified FSO-MIMO System With Repetition Coding Over Non-Identically Distributed Correlated Channels

et al. 2020

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This paper presents theoretical and experimental bit error rate (BER) results for a freespace optical (FSO) multiple-input-multiple-output system over an arbitrarily correlated turbulence channel. We employ an erbium-doped fiber amplifier at the receiver (Rx), which results in an improved Rx's sensitivity at the cost of an additional non-Gaussian amplified spontaneous emission noise. Repetition coding is used to combat turbulence and to improve the BER performance of the FSO links. A mathematical framework is provided for the considered FSO system over a correlated non-identically distributed Gamma-Gamma channel; and analytical BER results are derived with and without the pre-amplifier for a comparative study. Moreover, novel closed-form expressions for the asymptotic BER are derived; a comprehensive discussion about the diversity order and coding gain is presented by performing asymptotic analysis at high signal-tonoise ratio (SNR). To verify the analytical results, an experimental setup of a 2 × 1 FSO-multiple-inputsingle-output (MISO) system with pre-amplifier at the Rx is developed. It is shown analytically that, both correlation and pre-amplification do not affect the diversity order of the system, however, both factors have contrasting behaviour with respect to coding gain. Further, to achieve the target forward error correction BER limit of 3.8 × 10 −3 , a 2 × 1 FSO-MISO system with a pre-amplifier requires 6.5 dB lower SNR compared with the system with no pre-amplifier. Moreover, an SNR penalty of 2.5 dB is incurred at a higher correlation level for the developed 2 × 1 experimental FSO setup , which is in agreement with the analytical findings.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Section: B Ber Of Rc Over Correlated γ γ At With Edfa Pre-amplifier mentioning

confidence: 99%

Experimental and Analytical Investigations of an Optically Pre-Amplified FSO-MIMO System With Repetition Coding Over Non-Identically Distributed Correlated Channels

et al. 2020

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“…From (16) and (18), it can be seen that the optimal weighting scheme does not depend on R. For simplicity, we assume that R = 1 and hence we have w 1 = cos θ and w 2 = sin θ. Theorem 1: The solution of the optimisation problem (18) is given by…”

Section: System Model and Problem Formulationmentioning

confidence: 99%

“…Pointing errors which are generated by misalignment of the laser beam at the receiver is the second challenge towards FSO deployment [17,18]. The Málaga channel model can cover a wide range of channel conditions from weak to strong as well the effect of the pointing errors [16].…”

Section: Introductionmentioning

confidence: 99%

Efficient differential signalling with reduced background radiation for multiple aperture FSO communication systems

2020

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“…Although intensity modulation with direct detection (IM/DD) is widely used in LEO-StG optical communications due to its simplicity, especially on-off keying (OOK) and pulse-position modulation (PPM), the received signal photons per bit is limited which results in difficulties to establish a high capacity LEO-StG links [4]. Besides, atmospheric attenuation, pointing error and turbulence due to the atmospheric stochastic volatility may lead the fluctuations at the received signal power [5], [6], resulting in received signal power drop below the receiver's sensitivity threshold and deteriorating the system performance, especially for IMDD systems with limited transmit power and receiver sensitivity. Therefore, an advanced modulation technique is urgent for LEO-StG optical communications.…”

Section: Introductionmentioning

confidence: 99%

Phase Uniformly Distributed Circular MQAM Combined With Probabilistic Shaping for PM-CO-OFDM Systems in Satellite-to-Ground Optical Communications

et al. 2019

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Due to the rapid growth of high-resolution services, low earth orbit satellite-toground (LEO-StG) optical communications are expected to provide higher speed and better receiver sensitivity transmission. Here, we propose a phase uniformly distributed circular m-ary quadrature amplitude modulation (MQAM) combined with probabilistic shaping (PS) scheme for polarization multiplexing coherent optical orthogonal frequency-division multiplexing (PM-CO-OFDM) systems in LEO-StG communications to achieve high capacity transmission and improve receiver sensitivity as well as linewidth tolerance. In such scheme, the radius ratio of the circular 16/32QAM is optimized to maximize the minimum Euclidean distance (MED), and the constellation points of each ring are uniformly distributed to maximize the phase space of adjacent constellation points. Besides, the circular 16/32QAM is combined with probabilistic shaping (PS) to further increase the MED under the constraint of average transmit power. Simulation results of such circular 16/32QAM combined with PS scheme under different turbulence channels not only demonstrate its feasibility, but also show the improvements in receiver sensitivity and linewidth tolerance compared with regular 16/32QAM under same entropy. The improvement of receiver sensitivity is also experimentally validated. The superiorities of such scheme make it highly desirable for potential application in long-reach, non-relay, and high capacity LEO-StG optical communications.

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BER Performance of an Optically Pre-amplified FSO System Under Turbulence and Pointing Errors With ASE Noise

Cited by 60 publications

References 27 publications

Experimental and Analytical Investigations of an Optically Pre-Amplified FSO-MIMO System With Repetition Coding Over Non-Identically Distributed Correlated Channels

Experimental and Analytical Investigations of an Optically Pre-Amplified FSO-MIMO System With Repetition Coding Over Non-Identically Distributed Correlated Channels

Efficient differential signalling with reduced background radiation for multiple aperture FSO communication systems

Phase Uniformly Distributed Circular MQAM Combined With Probabilistic Shaping for PM-CO-OFDM Systems in Satellite-to-Ground Optical Communications

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