Design and Investigation of 10 Gb/s FSO Wiretap Channel Using OCDMA Time-Diversity Reception

Ji, Jianhua; Wu, Bing; Zhang, Jianjia; Xu, Ming; Wang, Ke

doi:10.1109/jphot.2020.2985747

Cited by 10 publications

(5 citation statements)

References 31 publications

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“…The binary symmetric channel (BSC) models of the main channel and the wiretap channel are shown in Figure 3a and b respectively [19]. X is the channel input of Alice.…”

Section: Figure 3 Bsc Modelsmentioning

confidence: 99%

Code design and interception probability of optical fibre communication system based on optical coding

Liu

Wang

et al. 2022

IET Communications

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Traditional optical orthogonal code has small code cardinality, which is vulnerable to the brute‐force attacks by eavesdroppers. In order to improve the anti‐interception performance of optical fibre communication system based on optical coding, a new family of optical code with large code cardinality is proposed. Based on information‐theoretic security, the interception probability of optical fibre coding system is proposed and defined, and the expression of the interception probability is derived for the first time. The influences of extraction distance, extraction ratio, the number of interfering users and the code length on the interception probability are analysed quantitatively. The anti‐interception performance of the optical coding system is investigated by numerical analysis and OptiSystem simulation. It is shown that reliability and anti‐interception performance can be achieved simultaneously by selecting appropriate code parameters and the number of interfering users.

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“…The binary symmetric channel (BSC) models of the main channel and the wiretap channel are shown in Figure 3a and b respectively [19]. X is the channel input of Alice.…”

Section: Figure 3 Bsc Modelsmentioning

confidence: 99%

Code design and interception probability of optical fibre communication system based on optical coding

Liu

Wang

et al. 2022

IET Communications

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“…2 Two-dimensional optical encoder/decoder Fig. 3 shows the experimental setup, in which a carton is used to simulate weak and moderate turbulence conditions by controlling different wind temperatures and speeds [17]. The corresponding sampling waveforms under different turbulences are shown in Fig.…”

Section: Wss Dropmentioning

confidence: 99%

“…In the encoder, the delays of TODL are 14.3 ps, 28.6 ps, 71.4 ps. In the decoder, the delays of TODL are 85.7 ps, 71.4 ps and 28.6 ps, respectively [17]. Fig.…”

Section: Wss Dropmentioning

confidence: 99%

“…An effective solution is to use physical layer security mechanisms. Among them, optical code division multiple access (OCDMA) can not only realize multiuser transmission, but also enhance optical layer security [17,18]. The authors theoretically studied the relay-assisted underwater wireless OCDMA [19], and the numerical results show that the performance can be improved by using relays.…”

mentioning

confidence: 99%

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Design and Experimental Investigation of Decode-and-Forward and Amplify-and-Forward Relaying FSO-CDMA

Zhang

Wang

et al. 2022

IEEE Photonics J.

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The scheme of combining relay and optical code division multiple access (OCDMA) is one of the effective methods to improve the reliability and security of free space optical (FSO) communication system. We experimentally investigate a 10 Gb/s decode-and-forward (DF) relaying FSO-CDMA system and a relaying amplify-and-forward (AF) FSO-CDMA system, respectively. Bit error rates (BERs) of DF and AF relaying FSO-CDMA are measured and compared under different turbulence conditions. The experimental results show that the BER of DF relaying FSO-CDMA is one to two orders of magnitude lower than that of AF relaying FSO-CDMA when the receiving power is -5.6 dBm. However, the performance gap is decreasing with the increase of receiving power, especially when there is an interfering user. At the receiving power -2.8 dBm, two-user AF and DF relaying FSO-CDMA systems have almost the same BER. Under both weak and moderate turbulence conditions, at the receiving power -2.8 dBm, the measured BER of the eavesdropper exceeds 0.1, which is larger than the BER threshold of soft-decision forward error correction code. Hence, physical layer security of FSO relaying system can be achieved by optical coding.

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“…Photonic-layer secure communication safeguards against adversarial detection in the optical domain by employing a range of security technologies, including optical chaos [1][2][3][4][5], optical code division multiplexing [6][7][8], quantum noise randomized ciphers [9][10][11][12], optical frequency hopping [13][14][15], quantum key distribution [16,17], and optical covert communication (OCC) [18][19][20][21][22][23]. OCC requires a higher level of security than merely protecting the content from unauthorized access through encryption, and the security requirement is imperceptibility for optical covert communication.…”

Section: Introductionmentioning

confidence: 99%

Time-Division Multiplexed Optical Covert Communication System Based on Gain-Switched Optical Pulses

Liu,

Yin,

Cui

et al. 2024

Photonics

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In optical covert communication systems based on gain-switched distributed feedback semiconductor lasers, the trade-off between the modulation frequency and the spectral imperceptibility limits the bit rate of the secure channel. To improve the system performance in terms of the bit rate and covertness, optical time-division multiplexing is introduced to optical covert communication for the first time. The optical time-division multiplexed covert channel can work under both multiple-user and single-user conditions. The optical time-division multiplexed covert communication system is demonstrated via a system simulation. The results show that the covertness is enhanced by the optical time-division multiplexing in the spectral domain. The receiver sensitivity of the multiple-user condition is lower than the single-user one.

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Design and Investigation of 10 Gb/s FSO Wiretap Channel Using OCDMA Time-Diversity Reception

Cited by 10 publications

References 31 publications

Code design and interception probability of optical fibre communication system based on optical coding

Code design and interception probability of optical fibre communication system based on optical coding

Design and Experimental Investigation of Decode-and-Forward and Amplify-and-Forward Relaying FSO-CDMA

Time-Division Multiplexed Optical Covert Communication System Based on Gain-Switched Optical Pulses

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