[Solved] 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 1.33μm.

Q.	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 1.33μm.
A.	0.51 μm
B.	0.58 μm
C.	0.61 μm
D.	0.49 μm
Answer» A. 0.51 μm

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