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

Ji, Jianhua; Huang, Qian; Sun, Lu

doi:10.1109/jphot.2019.2912965

Cited by 16 publications

(8 citation statements)

References 38 publications

(44 reference statements)

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“…In [12], 10 Gb/s two-user spatial diversity FSO-CDMA wiretap channel based on reconfigurable optical encoder/decoders is demonstrated. Considering the effect of weak turbulence, the FIGURE 1 Hybrid fiber-FSO-fiber CDMA system model physical layer security of OCDMA-based hybrid fiber-FSO system is analysed [13].…”

Section: Introductionmentioning

confidence: 99%

Investigation and demonstration of all‐optical hybrid fiber‐FSO‐fiber CDMA communication system

Peng

Song

et al. 2022

IET Communications

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The authors investigate and demonstrate an all‐optical hybrid fiber‐free space optical (FSO)‐fiber communication system based on optical code division multiple access (OCDMA). Under different turbulence effects, the interception probability and interception distance are used as security metrics, and optimal parameters are obtained when the system meets the requirements of reliability and security simultaneously. The interception probability increases with the enhancement of turbulence effect, and decreases as the number of interfering users increases. In the case of strong turbulence, the maximum interception probability is 4.14 × 10−4. The authors design and build a 10 Gb/s all‐optical hybrid fiber‐FSO‐fiber CDMA communication system. It is shown that, under the soft‐decision forward‐error‐correction threshold of 2 × 10−2, this scheme can guarantee physical layer security in the second 20‐km optical fiber link under different turbulence conditions, while the interception distance is 8 km in the first optical fiber link. Under the hard‐decision forward‐error‐correction threshold of 3.38 × 10−3, the whole system can ensure the physical layer security.

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Section: Introductionmentioning

confidence: 99%

Investigation and demonstration of all‐optical hybrid fiber‐FSO‐fiber CDMA communication system

Peng

Song

et al. 2022

IET Communications

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“…Hence, secrecy capacity is difficult to evaluate the physical layer security of OCDMA system. Interception probability, which is defined as the probability that the channel capacity of the legitimate channel is less than the channel capacity of the eavesdropping channel, is always used to evaluate the physical layer security of the wireless transmission system [15][16][17]. However, since there is no random fluctuation in the OCDMA-based optical fibre system, the interception probability cannot be evaluated quantitatively.…”

Section: Introductionmentioning

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 physical-layer security of OCDMA-based optical fiber communication system is analyzed in [18], and authors use security leakage factor to evaluate the physical-layer security level. OCDMA based hybrid FSO/fiber wiretap channel is proposed in [19], and the physical-layer security is analyzed theoretically, using the conditional secrecy outage probability as the performance metric. A novel type of OCDMA network for 2-D image transmission based on optical orthogonal signature pattern codes is proposed in [20].…”

Section: Introductionmentioning

confidence: 99%

10Gb/s Two-User Spatial Diversity FSO-CDMA Wiretap Channel Based on Reconfigurable Optical Encoder/Decoders

Zheng

Peng

et al. 2020

IEEE Access

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Due to the effect of atmospheric turbulence, the transmission reliability and physical-layer security of free space optical (FSO) communication system are facing many challenges. In this paper, for the first time, we design and investigate a 10 Gb/s reconfigurable FSO wiretap channel based on spatial diversity and optical code division multiple access (OCDMA). Reconfigurable two-dimensional optical encoder and decoder are constructed by wavelength selective switch and optical delay lines, and reconfigurable onedimensional optical encoder and decoder are constructed by couplers and tunable optical delay lines. Under three different turbulence conditions, bit error rates (BER) of legitimate user and eavesdropper are measured. It can be seen that under turbulence effects, BER of legitimate user in spatial-diversity is lower than that of non-diversity system. By the rapid code reconfiguration of legitimate users, the eavesdropper can only use unmatched decoder. Thus, the eavesdropping methods of code interception and brute-force searching can be avoided. Experimental results show that this scheme can ensure the reliable transmission of legitimate users, and the eavesdropper can't crack the information when the extraction ratio is 1%. Hence, reliability and physical-layer security can be enhanced simultaneously.INDEX TERMS Free space optical communication, optical code division multiple access, spatial diversity, atmospheric turbulence.

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

Cited by 16 publications

References 38 publications

Investigation and demonstration of all‐optical hybrid fiber‐FSO‐fiber CDMA communication system

Investigation and demonstration of all‐optical hybrid fiber‐FSO‐fiber CDMA communication system

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

10Gb/s Two-User Spatial Diversity FSO-CDMA Wiretap Channel Based on Reconfigurable Optical Encoder/Decoders

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