Step 1

1Open a new project with File > New > Single Fiber.
2Choose Calculation > Inverse Scattering Solver to get the Inverse Problem Solver dialog box.

Optical Grating - Inverse Problem Solver dialog box

3Set the From and To wavelength fields to 1.5498 and 1.5502.
4Set the grating length at 20 cm in the Length field.
5Click on the Ref/Trans Define button to define the reflection spectrum.

Optical Grating - User Defined Function

6Set the bandwidth to 0.4 nm and the reflectivity to 0.9 within this band.
7Click OK.
8Select the Disp radio button and click the adjacent Define button to define the dispersion spectrum.

Optical Grating - User Defined Function

9In this screen, set the dispersion to -1800 ps/nm for all wavelengths, as seen above.
10Click OK.
11Click the Causality button to see the impulse response of the specified spectrum.

Optical Grating - View 2d graph

12Click Close.

Step 2

1Click Start in the Inverse Problem Solver dialog box to start the layer peeling algorithm..
2Select the Delay tab.
3Select the red and light blue curves to show the transmitted and reflected delays. The dark blue curve shows the target delay.
4Click in the graph window and go to Tools > Group Delay

Optical Grating - Group Delay

  • The window displays the reconstructed group delay with a second order fitting.
    The dispersion is reported in the Results frame as -1773.79 ps/nm, in close
    agreement with the desired response.