We report on recent results obtained with a fiber optic hydrophone based on the intensity modulation of the laser light in a FBG (Fiber Bragg Grating) under the influence of the sound pressure. In order to control the behavior of the hydrophone in terms of sensitivity and bandwidth, FBGs have been coated with proper materials, characterized by different elastic modulus and shapes. In particular...

A high resolution optical vector network analyzer (OVNA) implemented based on a wideband and wavelength-tunable optical single-sideband (OSSB) modulator is proposed and experimentally demonstrated. The OSSB modulation is achieved using a phase modulator and a tunable optical filter with a passband having two steep edges and a flat top. Wideband and wavelength-tunable OSSB modulation is achieved...

Fiber-optic sensors, especially fiber Bragg grating (FBG) sensors are very attractive due to their numerous advantages over traditional sensors, such as light weight, high sensitivity, cost-effectiveness, immunity to electromagnetic interference, ease of multiplexing and so on. Therefore, fiber-optic sensors have been intensively studied during the last several decades. Nowadays, with the devel...

Abstract Structural health monitoring can detect anomalies in time, allowing the implementation of more efficient maintenance and repair actions special engineering structures. An alternative evaluation structures civil is use optical fibers inscribed with Bragg gratings (FBG or Fiber Grating). This paper aims to compare available techniques estimate elastic module cementitious composites, as w...

A study of chromatic dispersion (CD) in optical fibers, its effects on signal propagation, the devices to compensate it and the methods for its characterization. We have presented the experimental setups for the most popular frequency domain methods for CD measurement, Peucheret and Modulation Phase Shift Method (MPSM), as well as for an advanced method with improved performance, the Asymmetric...

Abstract: In a typical optic fiber Bragg grating (FBG) strain measurement, unless in an ideal static laboratory environment, the presence of vibration or often disturbance always exists, which often creates spurious multiple peaks in the reflected spectrum, resulting in a non-unique determination of strain value. In this report we attempt to investigate the origin of this phenomenon by physical...

This paper based on study of communication system over fiber optics. To design high speed system with high performance it is necessary to compensate the dispersion with the help of Fiber Bragg Grating. The performance of communication system simulation is done on Optisystem simulator Vr.12 at different parameters of the system. A high speed NRZ signal is transmitted over SSMF. By simulating the...

Rapid developments of structural sensing and control, data acquisition and processing, and computer technologies have made it feasible to monitor the structural health of large-scale structures in real time. SHM of large-scale infrastructures has increasingly attracted extensive interests from both fields of research and application. Based on recent research achievements of developing smart SHM...

We propose a Gaussian sampled fiber Bragg grating for multi-parameter sensing system. The sampled fiber Bragg grating combines the characteristics of fiber Bragg grating and long period grating. The transfer matrix method has been used to obtain the transmission spectrum of the grating. The shifts in narrowband loss peak and broadband loss peak in the transmission spectrum have been utilized to...

Abstract The deformation and reconstruction of the composite propeller under static load in laboratory is studied so as to provide basic research for underwater deformed propeller. fiber Bragg grating (FBG) sensor proposed be used strain monitoring carbon reinforced polymer (CFRP) propeller, a algorithm structural curvature CFRP based on information presented. verified by using variable-thickne...