Securitized Optical Fiber Communication and Sensor Systems Using Mode-Selective Couplers

Eftimov, Tinko; Bock, Wojtek J.; Balzhiev, Plamen; Plachkova, Vanya; Zhelyazkova, Katerina

doi:10.1109/jlt.2014.2326973

Cited by 5 publications

(4 citation statements)

References 21 publications

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“…The multimode fiber (MMF) speckle pattern, consisting of many granular bright spots, is formed as a result of interference between the modes propagating within the optical fiber [1]. This MMF speckle field is sensitive to external perturbations, and therefore is excellent in measuring a number of parameters [2][3][4][5][6][7]. MMF speckle sensors offer many advantages such as large coupling tolerance, easy installation and implementation of low-cost optoelectronics [8].…”

Section: Introductionmentioning

confidence: 99%

Investigation on sensitivity enhancement for optical fiber speckle sensors

et al. 2016

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We present a detailed theoretical and experimental study on the sensitivity enhancement for multimode fiber (MMF) speckle sensor. Using mode coupling theory, we derive an expression showing that the sensitivity of the MMF speckle sensor depends on the intensity profile of the MMF modes. Particularly, we use our theory to study the influence of the spatial filtering window on the sensitivity, and the experimental results have found a good agreement with the theory. Our results suggest that the sensitivity of an MMF speckle sensor can be greatly enhanced by adjusting the size and location of the spatial filtering window. An 80-fold improvement on sensitivity was achieved in our experiment, as compared with the conventional MMF speckle sensor with the filtering window placed at the center of the speckle field.

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Section: Introductionmentioning

confidence: 99%

Investigation on sensitivity enhancement for optical fiber speckle sensors

et al. 2016

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“…However, while fiber optic cables are extremely more secure than comparable copper cables, the interception of the optical signals transmitted through fiber is also possible [2]. For this reason, the problem of secure communications in optical links has also been a matter of study [3]- [5].…”

Section: Introductionmentioning

confidence: 99%

Physical-Layer Security in Free-Space Optical Communications

2015

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The communication between two legitimate peers in the presence of an external eavesdropper is studied from a physical-layer security perspective in the context of free-space optical (FSO) communications. We discuss viable mechanisms to eavesdrop the communication and study the effect of random optical irradiance fluctuations inherent to FSO communications on the probability of achieving a secure transmission. We observe that the joint effect of laser-beam divergence and turbulence-induced fading on the received irradiance, under certain conditions, allows an external eavesdropper close to the legitimate receiver to compromise the communication. Interestingly, we also observe that an eavesdropper placed close to the legitimate transmitter can easily compromise the communication by taking advantage of the larger attenuation suffered by the signal when propagating through the FSO link.

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“…To address this, recent strategies include employing a secret key generated from the atmospheric turbulence and scintillation characteristics of the FSO channel [14] or by controlling the radius of the beam using deflectors to decrease the probability of eavesdropping [15]. Mode division multiplexing (MDM) is a diversity technique for multiplexing several data streams using different eigenmodes for increasing channel capacity [16][17][18][19][20][21] and has in recent years been used for enhancing physical layer security [22][23][24]. In [23], the relation between confidentiality and data rate was examined for MDM, indicating that suitable code designs guarantee that the maximum data rate with perfect security is significantly higher in MDM systems than in systems based on quantum key distribution (QKD).…”

Section: Introductionmentioning

confidence: 99%

“…In [23], the relation between confidentiality and data rate was examined for MDM, indicating that suitable code designs guarantee that the maximum data rate with perfect security is significantly higher in MDM systems than in systems based on quantum key distribution (QKD). In [24], mode interference patterns of a grating sensor are leveraged for deformation and intrusion detection. In [23], to enhance security, a nonlinearity.…”

Section: Introductionmentioning

confidence: 99%

Optical Mode Division Multiplexing for Secure Ro-FSO WLANs

et al. 2015

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The widespread deployment of various wireless radio access systems in public areas poses acute issues in frequency assignment. Radio-over-free-space-optics (Ro-FSO) technology enhances spectral efficiency and may pave the way towards a ubiquitous platform for radio and optical domains without optical fiber in local area networks. This paper investigates the performance of simultaneous optical mode division multiplexing of a donut mode, a Laguerre-Gaussian (LG) mode and two Hermite-Gaussian (HG) modes to realize 4 x 20Gbps transmission in a Ro-FSO system under clear weather conditions. The power coupling coefficients, received power, signal-to-noise ratios and constellations and are analyzed.

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Securitized Optical Fiber Communication and Sensor Systems Using Mode-Selective Couplers

Cited by 5 publications

References 21 publications

Investigation on sensitivity enhancement for optical fiber speckle sensors

Investigation on sensitivity enhancement for optical fiber speckle sensors

Physical-Layer Security in Free-Space Optical Communications

Optical Mode Division Multiplexing for Secure Ro-FSO WLANs

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