scholarly journals Quantitative investigation of the refractive-index modulation within the core of a fiber Bragg grating

2006 ◽  
Vol 14 (22) ◽  
pp. 10332 ◽  
Author(s):  
Betty P. Kouskousis ◽  
Claire M. Rollinson ◽  
Daniel J. Kitcher ◽  
Stephen F. Collins ◽  
Greg W. Baxter ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Refractive Index Modulation ◽  
Quantitative Investigation ◽  
The Core ◽  
Index Modulation

Filament-Based Fabrication and Performance Analysis of Fiber Bragg Grating Sensors Using Ultrashort Pulse Laser

2014 ◽  
Vol 2 (2) ◽  
Author(s):  
Farid Ahmed ◽  
Martin B. G. Jun
Keyword(s):  
Refractive Index ◽  
Performance Analysis ◽  
Fiber Bragg Grating ◽  
Contact Force ◽  
Ultrashort Pulse ◽  
Axial Strain ◽  
Single Mode ◽  
Force Sensor ◽  
Bragg Grating ◽  
Refractive Index Modulation

The method of ultrashort pulse filamentation induced refractive index modification is employed to inscribe fiber Bragg grating (FBG) in single-mode optical fiber (SMF). Line-by-line index inscription technique is used to write refractive index modulation in the core of SMF. The proposed pulse filamentation based index modification enables controlled and flexible writing of FBGs in optical fibers. Performance analysis of the fabricated FBG has been carried out for temperature, contact force, pressure, and axial strain sensing. The in-fiber FBG exhibits sensing performance very similar to FBGs commercially available to date. Then, the written FBG is engineered to demonstrate highly sensitive contact force sensor.

scholarly journals Optical Fiber Bragg Grating Temperature Sensor

2014 ◽  
Vol 7 (4) ◽  
pp. 40-46
Author(s):  
Marwan L. Yousf ◽  
Ihssan A. Kadham ◽  
Tahreer S. Mansour ◽  
Khalil I. Hajim
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Grating ◽  
Temperature Sensor ◽  
Important Application ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Bragg Wavelength ◽  
Diffraction Plane ◽  
The Core ◽  
Index Modulation

In this work, uniform Fiber Bragg Grating (FBG) temperature sensor system were implemented and investigated due to measurement of the Bragg wavelength shift. An (FBG) is an optical fiber in which the refractive index in the core is perturbed by Germanium, forming a periodic index modulation profile. When light is guided through a fiber granting, it is scattered at each diffraction plane, except at those wavelengths which satisfy the Bragg resonance conditionAn important application of FBG technology is sensing. The reflected wavelength from the FBG depends on physical properties such as temperature. By integration the FBG with broadband light, the shift in peak reflectivity wavelength can be used as a measure for the temperature.It has been shown from the results that the FBG is very sensitive to variations in temperature degrees and the sensitivity was (1pm/0.1°C), also observed from the results, the relation between the shifted Bragg wavelength and temperature degrees was linear.

Investigated Solution Concentration Sensors Based on the Etched Phase Shifted Fiber Bragg Grating

2013 ◽  
Vol 380-384 ◽  
pp. 3239-3242
Author(s):  
Fu Gen Su ◽  
Xin Zhu Sang
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Grating ◽  
Solution Concentration ◽  
Bragg Grating ◽  
Bragg Wavelength ◽  
Cladding Layer ◽  
The Core ◽  
Surrounding Environment ◽  
Concentration Changes ◽  
Index Changes

To remove or reduce the cladding layer thickness of fiber Bragg grating, the refractive index changes in the surrounding environment will affect the fiber Bragg grating effective refractive index of the core, resulting in changes in the Bragg wavelength. Solution concentration changes will cause changes in refractive index of the solution. A new kind of solution concentration sensor is designed with the etched phase shifted fiber Bragg grating, and concentration sensing detection with four kinds of solutions is experimentally demonstrated. With resolution concentration increasing, the phase shifted label wavelength shifts to the red, and the sensor is more sensitive in the case of higher concentration.

scholarly journals Transverse Asymmetry of the Index Modulation Profile in Few-Mode Fiber Bragg Grating

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 87
Author(s):  
Peihong Guan ◽  
Min Tang ◽  
Min Cao ◽  
Yuean Mi ◽  
Mei Liu ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Attenuation Coefficient ◽  
Optical Communication ◽  
Mode Conversion ◽  
Bragg Grating ◽  
Mode Division Multiplexing ◽  
Single Side ◽  
Side Illumination ◽  
Index Modulation ◽  
Great Potential Application

The transverse asymmetry of the index modulation profile in the asymmetric few-mode fiber Bragg grating (FM-FBG) was investigated. The transverse asymmetry of the index modulation profile will lead to mode conversion between modes with the different azimuthal orders, and this asymmetry is characterized by the attenuation coefficient α. We evaluated that the value of attenuation coefficient α was 0.2 μm−1, and grating amplitude χ was 2.8 × 10−4 for FM-FBG inscribed by UV single-side illumination. We found that the optimized value of α was 0.16 μm−1, at which the maximum mode conversion efficiency of LP01–LP11 can be achieved. The results of this paper provide great potential application in few-mode fiber (FMF) devices and mode division multiplexing (MDM) optical communication.

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