An FBG is developed within a fiber core having a refractive index of 1.30. Find the grating period for it to reflect an optical signal with a wavelength of 1.33 m.

An FBG is developed within a fiber core having a refractive index of 1

1.	An FBG is developed within a fiber core having a refractive index of 1.30. Find the grating period for it to reflect an optical signal with a wavelength of 1.33 m.
A.	0.51 m
B.	0.58 m
C.	0.61 m
D.	0.49 m
Answer» B. 0.58 m