Dear Editor, This letter contributes to designing a resilient event-triggered controller for connected automated vehicles under cyber attacks, including denial-of-service (DoS) and deception attacks. To characterize the effect of DoS effective intervals attack are redivided based on sampling period. Then, distributed event-triggering mechanism is proposed compensate sabotage attacks reduce amount transmitted data. Since communication channel transmits data only at trigger instant, may occur...

We investigated an all-fiber mode converter based on long-period fiber gratings (LPFGs) written in the few-mode fiber. Mode conversion between fundamental core and different higher-order modes (LP11, LP21, LP02 modes) can be realized via a single LPFG with efficiency of 99% at resonance wavelength. Moreover, optimized LP01 LP21 by cascading two LPFGs grating pitches. The maximum is estimated to ∼99.5% 1553 nm. orbital angular momentum states topological charges (±1,±2) are demonstrated...

In this paper, we propose and demonstrate an all-optical second-order differentiator based on a two-stage self-coupled optical waveguide silicon-on-insulator platform. The transmission spectrum of the fabricated device has parabola-like filtering notch with 3-dB bandwidth up to ~ 100 GHz depth 12 dB. Experiments are carried out for 10-, 20-, 40-Gb/s time-domain multiplexing (OTDM) picosecond pulse trains, differentiations achieved using device.

A intensity-modulated optical fiber relative humidity (RH) sensor based on the side coupling induction technology (SCIT) is presented and experimentally demonstrated. The agarose gel twisted macro-bend structure are first combined for RH sensing applications. refractive index (RI) of increases with increase in linear proportion from 20 to 80%RH. power, which changes directly RI gel, can strip source noise signal improve ratio substantially. experiment results show that sensitivity proposed...

The accuracy of ultrasonic flowmeter time delay measurement is directly affected by the processing method echo signal. This paper proposes a for estimating gas based on Variational Mode Decomposition (VMD)–Hilbert Spectrum and Cross-Correlation (CC). improves enhancing quality To denoise forward reverse signals collected at various wind speeds, Butterworth filter initially used. are then analyzed Empirical De-composition (EMD) VMD analysis to obtain Intrinsic Function (IMF) containing...

In this letter, a novel multilongitudinal mode fiber-optic vibration sensor is presented. The beat frequency of any two different laser modes modulated by the signal. signal can be demodulated frequency-modulation demodulator. It demonstrated that from 60 Hz to 20 KHz measured successfully. has high sensitivity and signal-to-noise ratio, especially between 500 7.4 KHz.

A passively Q-switched Er-doped fiber laser using a simple and cost-effective saturable absorber (SA) of alcohol has been demonstrated. The SA is made through filling anhydrous in the gap between end-facets two optical patch cords, which are inserted into cannula. modulation depth with 820-μm layer measured to be 18%. Based on such an SA, Q-switching operation achieved. average output power 30.3 mW pulse repetition rate 81.9 kHz, thus, energy up 348.6 nJ. To best our knowledge, it first...

An air-coupled transducer was developed in this study, utilizing hollow glass microsphere-organosilicon composites as an acoustically matching layer, which demonstrated outstanding acoustic performance. Firstly, a comparison and analysis of the properties advantages different substrates carried out to determine potential application value organosilicon substrates. Immediately after, effect microspheres with particle sizes mass fractions on layer analyzed. It also evaluated mechanical before...

This study presents a novel method for determining the liquid level from outside of sealed container, which is based on balance echo energy received by two receiving sensors. The proposed uses one transmitting transducer and sensors that are encapsulated in coupling plane arranged certain rules. calculation comparison grounded difference ultrasonic impedance between gas media. First, analyzing propagation attenuation characteristics waves solid, an acoustic model calculating established...

We experimentally demonstrated an 850-nm VCSEL based 112-Gb/s short reach interconnection system with 200-m MMF transmission employing a duobinary 4-PAM format. The sensitivity of -4.8 dBm at the 6.7% overhead FEC limit (BER=4.2×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-4</sup> ) was achieved.

This research put forward an exogenous liquid level measurement method based on continuous sound wave amplitude. The distribution of round piston transducers in the field a metal solid was analyzed by building 15 Multi-Gaussian Beam superposition models; calculation for echo pressure worked out according to reflection and refraction properties ultrasonic wave. with three amplitudes used as driving source sensor, two single-crystal sensors same diameter were transmitting terminal receiving...

An approach to improve the side-coupling ratio of macro-bend polymer optical fiber (POF) coupler is proposed in this paper. Two naked POFs are twisted and twined around a cylinder achieve continuous liquid level sensing. Through filling gap between two with UV cement, both sensitivity measurement range increased substantially. The reversibility also improved since eliminated, little can exist structure decreasing. design turns out be good method enhance performance, could applied...

An optical fiber liquid level sensor based on two twisted polymer fibers twining around a racetrack column is demonstrated in this study. The side-coupling power of the passive modulated by refractive index (RI) environment medium and decreases while increases. variation patterns bent section straight form step attenuation, which can improve measurement range with superior sensitivity distinguish liquids different RIs. Furthermore, cost-effective also shows good reversibility low...

In this paper, a fiber-optic sensing interrogation system for simultaneous measurement of temperature and transversal loading based on single-passband RF filter has been proposed experimentally demonstrated. This consists fiber Mach-Zehnder interferometer (FMZI) as the device dispersive medium. The FMZI also acts spectrum slicer to induce continuous sampling, which results in frequency response together with Two arms are used measure respectively. change one arm introduces variation...

A quasi-distributed liquid leakage (QDLL) sensor in local area is proposed and experimentally demonstrated, providing a real-time yet low-cost method than the existing QDLL sensor. The mainly consists of flexible lamp belt (FLB) with light-emitting diodes (LEDs) polymer optical fiber (POF) processed side-coupling structures. structures are illuminated by LEDs one one, forming series sensing probes. lights side-coupled into POF through structure pulse sequences obtained from power meters...

In this Letter, the enhanced four-wave mixing (FWM) in photonic bandgap of fiber Bragg grating (FBG) has been achieved with an extra phase introduced by fast-light effect bandgap. The experiment for phase-matched FWM generation a special-designed FBG was carried out, as well simulations. energy conversion such demonstrated but transmissivity not. experimental results show agreement

This article presents a novel plate Luneberg lens which is based on the parallel waveguide filled with drilled dielectric material. To obtain effectively refractive index distribution, several small holes of nonuniform density are in this dielectric. In order to meet Law's requirement edge region, thickness substrate modified by boundary conditions electromagnetic fields. As feeding structure, single-ridge integrated into antenna.

A technique to enhance the response of Brillouin distributed sensors is proposed and experimentally validated. The method consists in creating a multi-frequency pump pulse interacting with continuous-wave probe. power each at distinct frequency lower than threshold for nonlinear effects, while sensor remains given by total all pulses. Distinct pulses are delayed avoid temporal overlapping cross-interaction; this requires smartly reconstruct traces before photo-detection. validated 50 km-long...

Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text K. Xu, C. Y. Wong, L. Zhang, Liu, G. N. W. Chow, and H. Tsang, "56 Gbit/s DMT Signal Generated by an Integrated Silicon Ring Modulator," in Conference Lasers Electro-Optics, OSA Technical Digest (2016) (Optica Publishing Group, 2016), paper STu1G.7. Export BibTex Endnote (RIS) HTML Plain alert Save article

A multipoint liquid level sensor based on the RI modulation of macrobend polymer optical fiber (POF) couplers is proposed. By twinning two twisted POFs around a race-track column, series U-shaped sensing heads are achieved. The output power in passive declines step form while immersed into turn. introduction UV cement gap between improves side-coupling ratio, increasing attenuation per step. For measurement range 100 cm, resolution 2 cm. can differentiate different liquids with low...

A broadband and scalable mode multiplexer (MUX) using an adiabatic coupler (AC) assisted with subwavelength grating (SWG) is proposed analyzed in detail. The consists of a strip bus waveguide tapered whose width decreases along the propagation direction so that fundamental TE cannot be supported well will coupled into high-order via evolution due to phase matching. On contrary, injected keep propagating same negligible coupling. SWG incorporated gap between waveguides for effectively...