EDFA-Based All-Optical Relaying in Free-Space Optical Systems

Bayaki, E.; Michalopoulos, Diomidis S.; Schober, Robert

doi:10.1109/vetecs.2011.5956657

Cited by 24 publications

(26 citation statements)

References 14 publications

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“…f = p 2 • R b /2 is the effective noise bandwidth, where R b denotes the bit rate. α r is the attenuation of the background noise power of Bob on the fiber link, expressed as α r = 10 −αd 2 /10 [29].…”

Section: Eavesdrop On the Fso Linkmentioning

confidence: 99%

Performance Analysis and Experimental Investigation of Physical-Layer Security in OCDMA-Based Hybrid FSO/Fiber Wiretap Channel

Huang

Sun

2019

IEEE Photonics J.

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In this paper, optical code division multiple access (OCDMA) based hybrid freespace optical (FSO)/fiber wiretap channel is proposed, and the physical-layer security is analyzed theoretically, using the conditional secrecy outage probability as the performance metric. Taking into account the background noise, multiple-access interference, shot noise, and thermal noise, the closed expression of the conditional secrecy outage probability is obtained. Under the condition that the eavesdropper intercepts information on the fiber link and the minimum conditional secrecy outage probability is zero, the safe transmission distance and interception distance of the system are defined and studied. Furthermore, a 10-Gb/s experimental system of OCDMA-based hybrid FSO/fiber wiretap channel is built for the first time. The bit error rates of the legitimate user and eavesdropper are measured as well as the interception distance of the system.

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Section: Eavesdrop On the Fso Linkmentioning

confidence: 99%

Performance Analysis and Experimental Investigation of Physical-Layer Security in OCDMA-Based Hybrid FSO/Fiber Wiretap Channel

Huang

Sun

2019

IEEE Photonics J.

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“…For the purposes of this work, we assume that background radiation has a uniform spectral density P bg within the optical bandwidth B o of the receiver. The background radiation is independent from the ASE noise generated in the SOA [39], and it is straightforward to modify the noise variances in (22)…”

Section: Impact Of the Background Noisementioning

confidence: 99%

σ_{shot}^{2} false(z false) = 2 q R ()(, P_{out} false(z false) + ()(, false(G - 1 false) P_{n} + G P_{bg}) B_{o}) B_{e}

σ_{sig - sp, bg}^{2} false(z false) = 4 R^{2} P_{out} false(z false) ()(, false(G - 1 false) P_{n} + G P_{bg}) B_{e}

and

σ_{sp, bg - sp, bg}^{2} = R^{2} {()(, false(G - 1 false) P_{n} + G P_{bg})}^{2} false(2 B_{o} - B_{e} false) B_{e}

Again, a worst‐case scenario is considered for the system operation in (34), where the background radiation does not saturate the SOA gain and receives small‐signal gain amplification.…”

Section: Soa As Pre‐amplifiermentioning

confidence: 99%

Semiconductor optical amplifiers in negative‐exponential fading: regenerators and pre‐amplifiers

Sagias¹,

Yiannopoulos²,

Boucouvalas³

2015

IET Optoelectronics

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In this study, the authors discuss the mitigation of negative-exponential fading in optical wireless communication systems. The mitigation technique involves the utilisation of a semiconductor optical amplifier (SOA) that, depending on the link arrangement, acts either as regenerator or pre-amplifier. As a regenerator, the SOA gain saturates during normal link operation and increases when the link experiences a fade. This unbalanced SOA operation serves towards the equalisation of the signal power at its output and fades become less severe and of reduced duration. The analytical results predict that the fade probability is reduced by over 90% and the scintillation index is improved by 75% for an optimal level of the received power. Moreover, the average duration of fades is also reduced by 68% for the same power level. As a pre-amplifier, the SOA modifies the noise statistics at the receiver and provides a static sensitivity increase of at least 10 dB at 10 Gb/s, depending on the bit-error-rate (BER) target. The analytical results show that this sensitivity improvement imparts a reduction of one order of magnitude on the average BER, of at least 94% on the outage probability and of at least 78% on the average duration of fades.

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“…niques been proposed with a goal to immunize the OWC system against the stochastic response of the atmospheric channel. Applicable techniques include the focusing of beams by mirrors [7], beam averaging on large aperture receivers [18], diversity in the space and time domains [9,10,12,14,19], coding [3,17,20,23], relaying [5,6,16] and amplification [1,5,13,15]. Combinations of these techniques have also been proposed, while the coutilization of spatial diversity and amplification has previously reported increased resilience against fades by using optical amplifiers in conjunction with equal-gain combiners (EGCs) at the electronic receiver [15,22].…”

Section: Introductionmentioning

confidence: 99%

Optimal Combiners in Pre-Amplified Optical Wireless Systems under Medium-to-Strong Atmospheric Turbulence

Sagias

Boucouvalas

Yiannopoulos

et al. 2016

Image Processing &Amp; Communications

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In this work we analytically investigate optimal combiners for pre-amplified diversity receivers that operate under medium-to-strong atmospheric turbulence. We first demonstrate that the combiner performance is strongly affected by the existence of a signal-amplified spontaneous emission beat noise at the output of the photodetector. Due to the signal-dependent nature of noise, the optimal combiner can be classified as a hybrid one, of which performance is between the well-known equal-gain and maximal-ratio combiner architectures. Having established the optimal design, we further assess the proposed combiner performance over gamma-gamma and negative-exponential fading environments.

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EDFA-Based All-Optical Relaying in Free-Space Optical Systems

Cited by 24 publications

References 14 publications

Performance Analysis and Experimental Investigation of Physical-Layer Security in OCDMA-Based Hybrid FSO/Fiber Wiretap Channel

Performance Analysis and Experimental Investigation of Physical-Layer Security in OCDMA-Based Hybrid FSO/Fiber Wiretap Channel

Semiconductor optical amplifiers in negative‐exponential fading: regenerators and pre‐amplifiers

Optimal Combiners in Pre-Amplified Optical Wireless Systems under Medium-to-Strong Atmospheric Turbulence

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