Performance analysis of cladding radius on spectral behaviour and sensitivity of LPFG with ambient refractive index higher than cladding region

2021 ◽  
Vol 53 (8) ◽  
Author(s):  
Shivendu Prashar ◽  
Sartajvir Singh ◽  
Vishakha Sood
Keyword(s):  
Refractive Index ◽  
Performance Analysis ◽  
Spectral Behaviour

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.

TEM characterization of proton-exchanged LiNbO3 optical waveguides

1986 ◽  
Vol 44 ◽  
pp. 480-481
Author(s):  
W. E. Lee
Keyword(s):  
Refractive Index ◽  
Benzoic Acid ◽  
Optical Waveguides ◽  
Total Internal Reflection ◽  
Index Of Refraction ◽  
Optical Measurements ◽  
Lithium Ions ◽  
Wide Channel ◽  
Tem Characterization

An optical waveguide consists of a several-micron wide channel with a slightly different index of refraction than the host substrate; light can be trapped in the channel by total internal reflection.Optical waveguides can be formed from single-crystal LiNbO3 using the proton exhange technique. In this technique, polished specimens are masked with polycrystal1ine chromium in such a way as to leave 3-13 μm wide channels. These are held in benzoic acid at 249°C for 5 minutes allowing protons to exchange for lithium ions within the channels causing an increase in the refractive index of the channel and creating the waveguide. Unfortunately, optical measurements often reveal a loss in waveguiding ability up to several weeks after exchange.

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