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Modes in the waveguide with high delta n

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(joined February 2015)
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Hi everybody! basic question: model test structure – very wide waveguide with high delta n. Standard cladding n_clad=1.48. OptiMode_Solver finds modes for the core index up to n_core=1.7. However, somehow it does not find mode for n_core=1.8 or higher (same structure). What do I miss?
Thanks!
John

Responses (9):

    • #17415
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      John
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      Hi everybody! basic question: model test structure – very wide waveguide with high delta n. Standard cladding n_clad=1.48. OptiMode_Solver finds modes for the core index up to n_core=1.7. However, somehow it does not find mode for n_core=1.8 or higher (same structure). What do I miss?
      Thanks!
      John

    • #17419
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      Damian Marek
      Participant

      Hi John,

      Can you attach the OptiMode file you are using? From a guess I would say you might need to increase the mesh resolution if the field is strongly confined to the core.

      Regards

    • #17424
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      John
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      Hi Damian,

      File is attached. I did try to increase mesh resolution – no help at all… It finds modes in 2D but not in 3D. everything is OK if n<=1.7

      Best!

      John

      Attachments:
    • #17449
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      John
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      Hi Damian,
      Any insights?
      John

      • #17495
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        Damian Marek
        Participant

        Hey John,

        I can’t say exactly why your file was not working, it gave me a memory warning when I tried to run it! I rebuilt it in both OptiMode and OptiBPM and it works fine. Attached is the BPM file, if you don’t have the same version I would say just try rebuilding the file from scratch. I only needed a mesh of 200×200 to find modes in the n = 1.8 case.

        Regards

    • #17454
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      Ravil
      Participant

      Hi John,

      As I can understand, you are using OptiBPM. Did you model your experiment somewhere else?

    • #17481
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      John
      Participant

      Hi Ravil,
      I am working on a more complex model for FDTD for propagation studies in high contrast waveguides.
      John

    • #17521
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      Ravil
      Participant

      Hi John,
      Unfortunately I don’t have a lot of experience with FDTD, but I’ve got the same results as Damian

    • #17872

      I think I have the same problem, I was suspicious about my computer because windows 8.1 some of the times this error will happened

    • #17885
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      mohammed mostafa
      Participant

      I haven’t alot of experience with FDTD , i think if you attach the project it may be better

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