Material Dispersion

[elisa saadah]

Hallo,
my name Elisa Saadah, I’m a student University of Riau, Indonesia
I want ask something about OptiGrating
Hope you can answer because this thing make me confuse
in OptiGrating 4.2 , there is lesson about material dispersion
and the then the final result is a graph between, trasmitivity/reflectivity and wavelength
there is note ..

The graph shows the wavelengths for which the grating with period 450 μm will
transfer the incident mode’s power to the other five modes.

my question how the connection between power with transmistivity/refelctivity?

and for the graph, its the graph show transmitivity from multimode FBG?

Thanks a lot for the answer

[Steve Dods]

The graph is the transmitted power in the incident mode, LP(0,1). In the Fiber Modes dialog box, there are 5 other modes selected: LP(0,2) to LP(0,6). As the wavelength changes, the grating period of 450 microns will sometimes be the right period to couple light from LP(0,1) to one of the other modes. If coupling occurs, the power is lost from the LP(0,1) mode and it appears in the graph as a dip.

[elisa saadah]

Oo… thanks a lot, but can you give some good reference about power and mode sir…?

[elisa saadah]

and why if i try without dipersion the result only three not five?

[Author]

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