Acronyms and abbreviations


Theoretic Study of Cascaded Fiber Bragg Grating DOI: http://dx.doi.org/10.5772/intechopen.83020

4.7 Comparisons between reflectivity and bandwidth for different cascaded

Table 1 show different cascaded apodized fiber Bragg grating variations of

From Table 1 we noted that as the number of cascaded units of fiber Bragg grating is increased the reflectivity is slightly decreased and the bandwidth

In this work the model equations of the cascaded uniform fiber Bragg grating

1. Uniform FBG in case one unit R = 99%, BW = 0.22 nm and exist side lobes but

2. For Hamming, Barthan and Nuttall FGB achieved high reflectivity and narrow

3. For sinc and proposed FBG achieved narrow bandwidth without side lobes.

4.High reflectivity achieved in case of Barthan apodization function where,

5. Narrow bandwidth achieved in case of proposed apodization function where,

I always feel indebted to ALLAH whose blessings on me cannot be counted. I would like to thank the anonymous reviewers of IntechOpen and Academic Editor: Dr. Shien-Kuei Liaw for their valuable comments. Finally, but most importantly, I am really indebted to my parents, sisters, brother and my wife for their continuous support throughout all my studies. Hope they find in my current achievement a

and different cascaded apodization functions are numerically handled and processed via specially cast software to achieve maximum reflectivity, narrow bandwidth and minimum side lobes. For better performance the proper values for grating length and refractive index modulation must be chosen to achieve maximum reflectivity and narrow bandwidth. The minimization in side lobes achieved

by using cascaded units from FBG. From this study we concluded that:

bandwidth with minimum side lobes in fourth unit FBG.

BW = 0.0081 nm in fourth unit without side lobes.

for fourth unit R = 96%, BW = 0.16 nm with minimum side lobes.

reflectivity, R and bandwidth with the increase of number of stages.

units of apodized fiber Bragg grating

Fiber Optic Sensing - Principle, Measurement and Applications

decreased with minimum side lobes.

R = 99% in fourth unit.

Acknowledgements

reward for their care and love.

Acronyms and abbreviations

DC dispersion compensation

FBG fiber Bragg grating RI refractive index

20

5. Conclusions
