Optimal method of designing triangular-spectrum fiber Bragg gratings with low index modulation and chirp-free structure

2009 ◽  
Vol 26 (5) ◽  
pp. 1042 ◽  
Author(s):  
Yongkang Gong ◽  
Aoxiang Lin ◽  
Xiaohong Hu ◽  
Leiran Wang ◽  
Xueming Liu
Keyword(s):  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Optimal Method ◽  
Index Modulation

Numerical Analysis of Thermal Dependence of the Spectral Response of Polymer Optical Fiber Bragg Gratings

2016 ◽  
Vol 12 (1) ◽  
pp. 85-95 ◽  
Author(s):  
Hisham Hisham
Keyword(s):  
Optical Fiber ◽  
High Stability ◽  
Spectral Response ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Bragg Reflector ◽  
Polymer Optical Fiber ◽  
Thermal Dependence ◽  
Silica Optical Fiber ◽  
Index Modulation

The thermal dependence of the spectral response (i.e. transmission, reflection and time delay ( r) responses) of uniform polymer optical fiber (POF) Bragg gratings has been investigated. In addition to the temperature dependence, the effects of grating strength (kLg) and fiber index modulation ( n) have been investigated. Besides high capability of tunable wavelength due to the unique large and negative thermo-optic coefficient of POF, the spectral response for POF Bragg gratings show high stability and larger spectrum bandwidth with temperature variation compare with the silica optical fiber (SOF) Bragg gratings, especially with the increase of the kLg value. It was found that by increasing kLg, the peak reflectance value increases and the bandwidth of the Bragg reflector become narrower. Also it’s shown by increasing the kLg value, r deceasing significantly and reach its minimum value at the designed wavelength ( B). Furthermore, the r for POF Bragg gratings is less than that for SOF Bragg gratings at the same value of kLg. Also it’s found that the peak reflectivity value increases to around 60% when the n value increases from 1*10-4 to 5*10-4.

Dynamic index modulation mechanism in polarization-maintained fiber Bragg gratings induced by transverse acoustic waves

2009 ◽  
Vol 48 (24) ◽  
pp. 4709 ◽  
Author(s):  
Ren Miao ◽  
Wei Zhang ◽  
Xue Feng ◽  
Jianhui Zhao ◽  
Xiaoming Liu
Keyword(s):  
Acoustic Waves ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Dynamic Index ◽  
Transverse Acoustic ◽  
Index Modulation

scholarly journals High-Order-Tilted Fiber Bragg Gratings With Superposed Refractive Index Modulation

2018 ◽  
Vol 10 (1) ◽  
pp. 1-8
Author(s):  
Xuan-Yu Zhang ◽  
Hong-Bo Sun ◽  
Chao Chen ◽  
Yong-Sen Yu ◽  
Wei-Hua Wei ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
High Order ◽  
Refractive Index Modulation ◽  
Index Modulation

scholarly journals Optimal parameters for fiber Bragg gratings for sensing applications: a spectral study

2021 ◽  
Vol 3 (6) ◽  
Author(s):  
P. V. Raja Shekar ◽  
D. Madhavi Latha ◽  
Kusum Kumari ◽  
V. G. K. M. Pisipati
Keyword(s):  
Spectral Response ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Main Peak ◽  
Intensity Increase ◽  
List Type ◽  
Maximum Reflectivity ◽  
Sensing Applications ◽  
The Impact ◽  
Index Modulation

Abstract The spectral characteristics viz. reflectivity, bandwidth, and sidelobes’ intensity for uniform and apodized (Gaussian, hyperbolic tangent, apod1, sine, and raised sine) fiber Bragg gratings (FBGs) were studied as a function of grating length and index modulation. The optimal grating length and index modulation to obtain maximum reflectivity and minimum sidelobes were determined, as needed for sensing applications. The impact of various apodization profiles on the spectral response has also been assessed. The results indicate that out of the apodization profiles considered for the study, sine, Gaussian, and raised sine profiles offer the desired output. Article highlights The reflectivity (of main peak) and sidelobes’ intensity increase with grating length and index modulation. The bandwidth decreases with grating length and increases with index modulation. The ideal grating length and index modulation were found to be 5 mm and 0.0008 respectively to obtain maximum reflectivity and minimum intensity for sidelobes. Sine, Gaussian, and raised sine profiles are the best suitable apodization profiles among those considered.

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