Meander Waveguide

This BeamLab demo shows a waveguide with a user-defined cross-section and a sinusoidally oscillating waveguide center. The fundamental mode is launched into the user-defined trapezoidal multi-mode waveguide and then partly coupled to higher-order modes in the meander section. After the meander section an adiabatic transition to a low-index single-mode waveguide strips the excited higher-order modes from the fundamental mode.

BeamLab demo script: meander.m

The propagation structure consists of a custom waveguide with a trapezoidal core. The waveguide center as a function of the distance z follows first a straight line, then a sinusoidally oscillating curve, and finally another straight line. In the last propagation section, the refractive index of the trapezoidal waveguide is continuously decreased as a function of the distance z. Only a few lines of MATLAB code are required for defining both the trapezoidal core shape and the meander waveguide center.

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This video shows how the intensity distribution changes along the propagation distance z. The figure shows the two-dimensional intensity distribution I(x,y) normalized to the input intensity and displayed on a logarithmic scale from -20 dB to 0 dB. The white lines indicate the location of the waveguide.

After the calculation has finished, the intensity distribution as a function of propagation distance z is plotted. The figure above depicts the intensity distribution I(x,z) at y = 0 µm. The white lines indicate the locations of the waveguides.

This figure shows a compact three-dimensional view of stacked plots, each portraying the intensity distribution I(x,y) at different distances z.

About BeamLab

BeamLab is an award-winning set of simulation tools for beam propagation through optical devices and waveguides in your familiar MATLAB® environment. It offers a high flexibility in waveguide design and post-processing of any output data.