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Reflection Spectrum of Surface-Relief Grating in a Rib Waveguide
Tools used: GratingMODThis example will compute the reflection spectrum for a simple rib waveguides with a sinusoidal higher perturbation.
Creating the StructureThe rib waveguide used in this example is typical of those used in DFB design: a substrate index of 3.34, a core index of 3.44, a cover index of 1, a width of 2 μm, a height of 2.5 μm, and a slab height of 1.25 μm. The grating will consist of a height perturbation with a modulation depth of 10%, have a length of 200 μm, and a desired central wavelength of 1.55 μm.
A cross-section of several periods of the refractive index appears as:
Simulation ResultsFor this simulation, the built-in mode solvers will be used to compute the modes of the structure. One such mode is:
The computed reflection spectrum for this grating is: