Designing of Fiber Bragg Gratings for Long-Distance Optical Fiber Sensing Networks

Table 1

Optimal FBG grating parameters for raised sine, Gaussian apodization, and sine apodization with modulation index , , and .

Apodization type	Modulation index (×10^-4)	Grating length (mm)	Reflectivity (%)	FWHM (nm)	SLS (dB)
Raised sine	1.0	20	90.3	0.112	35.6
	1.5	13	90.0	0.173	35.7
	2.0	10	90.4	0.228	35.4
Gaussian	1.0	19	90.0	0.110	26.0
	1.5	14	93.1	0.160	24.7
	2.0	10	91.7	0.216	26.9
Sine	1.0	16	90.9	0.118	20.1
	1.5	11	91.9	0.176	20.7
	2.0	13	99.0	0.210	22.5