Meshing for Distributed Bragg Grating Filter in COMSOL

In summary, the conversation is about simulating a distributed Bragg grating filter using comsol. The speaker is using a specific type of mesh but is not getting the expected results. They are looking for suggestions on how to properly mesh the Bragg layers in order to achieve better accuracy and simulation time. One suggestion is to define a faux structure around the critical section and mesh it smaller while using a larger mesh for the larger dimensions. This can greatly improve the results.
  • #1
haver
1
0
Hello everyone!
I am simulating a distributed Bragg grating filter using comsol. The mesh i used is like wavelength/index/8, but i do not get symmetric spectrum to Bragg wavelength.Layers are λ/4 width. Is there a special meshing for these Bragg layers? Or is there someone who can give me suggestion?
Thank you.
 
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  • #2
You probably need to mesh smaller.

One trick: if you have a particular section of a system that has a large difference in critical physical dimensions within a larger piece of material, you can define a faux structure around that critical section (of the same material) and tell Comsol to mesh that volume smaller but then use a larger mesh for the larger dimensioned pieces. This can have a radical improvement on both accuracy and simulation time.
 

1. What is a Distributed Bragg Grating (DBG) filter?

A Distributed Bragg Grating (DBG) filter is an optical device that uses periodic variations in refractive index to selectively reflect certain wavelengths of light. It is commonly used as a filter in optical communication systems to separate different wavelengths of light.

2. What is meshing and why is it important for DBG filters in COMSOL?

Meshing is the process of dividing a complex geometry into smaller elements in order to accurately simulate it in a computer program like COMSOL. For DBG filters, meshing is important as it allows for a more precise simulation of the device's optical properties and performance.

3. How does COMSOL handle meshing for DBG filters?

COMSOL uses a finite element method to mesh the geometry of a DBG filter. This involves dividing the geometry into smaller elements, called mesh elements, and using mathematical equations to simulate the behavior of light as it passes through each element.

4. What are some common challenges in meshing for DBG filters?

One of the main challenges in meshing for DBG filters is balancing the need for a fine mesh to accurately simulate the device with the computational resources required to do so. Another challenge is ensuring that the mesh is well-defined and does not contain any overlapping or distorted elements.

5. Are there any tips for optimizing meshing for DBG filters in COMSOL?

Yes, there are several tips for optimizing meshing for DBG filters in COMSOL. These include using symmetry to reduce the size of the mesh, using adaptive meshing techniques, and adjusting the mesh size in areas of high curvature or where there are sharp transitions in the refractive index. It is also important to carefully review the mesh and make any necessary adjustments before running simulations.

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