Reflectivity measurement of weak fiber Bragg grating (FBG)
For measuring ultra-weak grating reflectivity, the grating group with an identical wavelength was used. By using anhydrous alcohol and deionized water as the reflecting medium, the
Weakly
Reflective
Fiber
Bragg
PIC
Domestically pioneered: Large-scale Fiber Bragg Grating Array
The on-site presentation featured large-scale identical weakly reflective fiber Bragg grating arrays with a grating wavelength of 1550 nm, minimum grating length of < 0.5 mm, minimum grating
High-Spatial-Resolution High-Accuracy OFDR Distributed Sensors
This paper proposes a novel high-spatial-resolution high-accuracy OFDR distributed sensor based on a seamless femtosecond weak fiber Bragg grating (WFBG) array.
Study of fiber Bragg grating sensor system based on OFDR/WDM
A novel interrogating fiber grating array based on optical frequency domain reflectometry (OFDR) and wavelength division multiplexing (WDM) techniques was reported, and address inquiry
Multi-Channel OFDR Strain Sensor Based on Wavelength/Space
Abstract: A multi-channel OFDR strain sensor was demonstrated based on femtosecond-laser-inscribed wavelength/space division multiplexing weak fiber Bragg grating array (WFBGA) in
High-temperature resistance weak fiber Bragg grating array fabrication
Abstract Polyimide coated weak fiber Bragg grating array (PI-wFBGA) fabricated online by drawing tower overcomes the temperature limitation of conventional acrylate coating, and has broad
Basic Theory and Operating Principles of Optical Frequency Domain
This paper presents and explores a basic derivation of OFDR-FBG signals, the processing of those signals, the assembly of a basic OFDR system, an example measurement
Bragg Gratings
Fiber Bragg gratings have emerged as major components for dispersion compensation because of their low loss, small footprint, and low optical nonlinearity.
Basic Theory and Operating Principles of Optical Frequency Domain
Optical frequency domain reflectometer (OFDR) systems provide for the interrogation of hundreds of fiber Bragg gratings (FBGs) within a single optical fiber. The coupling of FBG sensors to
Newest Methods and Approaches to Enhance the Performance of
Using OFDR, temperature and strain perturbations were detected in a 3 km fiber loop of polarization-maintaining anisotropic optical fiber . The authors proposed a method for deviation
Fiber Bragg Grating
A fiber Bragg grating, which has periodical perturbation of the refractive index in the fiber core, acts as a wavelength-selective reflection filter. UV (ultra violet) exposure causes a refractive-index change in
Bragg Gratings
Bragg gratings are reflecting structures with a periodic refractive index modulation. They are contained in dielectric mirrors and in some fiber devices.
Dynamic noise suppression and high-precision interrogation of large
Xinyue Yu, Xing Liu, Dexin Ba, Yongkang Dong, "Dynamic noise suppression and high-precision interrogation of large-scale identical weak grating arrays in OFDR systems," Proc. SPIE 13961,
Real-Time Monitoring of Strain Processes With Large-Range and High
In this article, the optical frequency domain reflection (OFDR) collocated with weak reflection fiber bragg grating (FBG) sensors (WRFBGs) was proposed to actively carry out multiple
Model-Based Position and Reflectivity Estimation of Fiber Bragg Grating
We propose an efficient model-based signal processing approach for optical fiber sensing with fiber Bragg grating (FBG) arrays. A position estimation based on an estimation of distribution
High-Precision and Large-Scale Identical Ultra-Weak FBG Sensors
To achieve the large-multiplexing capability, identical weak fiber Bragg grating (WFBG) sensors typically adopt a short grating length to reduce the reflectivity. However, the corresponding broadband
Optimal parameters for fiber Bragg gratings for sensing
Abstract The spectral characteristics viz. reflectivity, bandwidth, and sidelobes'' intensity for uniform and apodized (Gaussian, hyperbolic tangent, apod1, sine, and raised sine) fiber Bragg
A novel demodulation technique for identical weak fiber Bragg grating
An interrogation technique for large-capacity densely spaced fiber Bragg grating (FBG) arrays is demonstrated using incoherent optical frequency domain reflectometry (I-OFDR).
OFDR shape sensor based on a femtosecond-laser-inscribed weak
An optical frequency domain reflectometry (OFDR) shape sensor was demonstrated based on a femtosecond-laser-inscribed weak fiber Bragg grating (WFBG) array in a multicore fiber (MCF).
High-Spatial-Resolution High-Accuracy OFDR Distributed Sensors
In optical frequency domain reflectometry (OFDR), the random optical noise in Rayleigh backscattering and the sliding window length in the algorithm cause a trade-off between sensing
Online reflectivity measurement of an ultra-weak fiber Bragg grating
An online measurement method is introduced to ensure the reflectivity of an arbitrary grating in a large-scale ultra-weak fiber Bragg grating (FBG) array. The measurement errors were
Strength properties of femtosecond-induced defects and weak Bragg
The paper reports the results of a study on the mechanical reliability of fiber Bragg gratings and point defects used as weak reflectors in phase-sensitive distributed fiber sensor systems.