Composition and Decomposition of modes

[saima buzdar]

In Optifiber What does mean by composition and decomposition of modes?
How deal with these parameters?

[Damian Marek]

These options allow the user to add (composition) the fiber modes together with differently weighted amplitudes and phases and propagate the spatial signal along the fiber to determine how the field evolves after propagating. The decomposition option allows the user to calculate the amplitudes and phases of the fiber modes that add to give a Gaussian signal or a signal that can be imported. This is useful for looking at coupling between different fibers or another component.

Cheers!

[saima buzdar]

Thanks Damian, But I am still confused with power and phases calculated in decomposition of Modes.
Is that power and phase of each is calculated w.r.t input field?
how we calculate the input power given to that modes? please you can specify any mathematical formula.

Thanks

[Damian Marek]

In the technical background there is a short description of the coupling calculation (decomposition of a field). Yes, the power column gives the fraction of power that would be coupled into the mode.

The eigenmodes that make up the solution to a waveguide are linearly independent, so they can be used as a basis for constructing fields. The decomposition computation calculates the coefficients that multiply by these eigenmodes to give the best representation of the field. These coefficients also represent the amount of power that would be coupled into a mode.

Regards

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