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33 mm switch length

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    • November 12, 2014 at 3:38 pm #15303
      Ravil
      Participant

      Dear Optiwave Team and forum members,

      Can you, please, briefly explain me the reason of choosing whole switch device length of 33 mm with only 100 microns width. I’m talking about a wafer which was used in “Lesson 14: Mach-Zehnder Interferometer Switch”.

      Will be very thankful to any reply!

    • November 12, 2014 at 4:45 pm #15305
      Steve Dods
      Participant

      Those dimensions are chosen to make the simulation as efficient as possible. The length and width are chosen so as to be large enough to enclose the entire optical field, but small enough so that the simulation does not waste time on places that have no optical field. The Mach-Zehnder device is long and narrow, so the simulation zone is too.

    • November 12, 2014 at 4:52 pm #15306
      Ravil
      Participant

      Thanks, Steve! I have a follow-up question: according to this tutorial I should be able to check the refractive index profile of different slices through the device in x-y plane, for example. But after I’m putting z-distance in the required box I can’t locate the ‘View’ button. Can you, please, help me with that?

    • November 12, 2014 at 5:39 pm #15307
      Ravil
      Participant

      Can you, please, also provide any info/references which have been used for simulation parameters such as

      Mesh—Number of points: 500
      BPM solver: Paraxial
      Engine: Finite Difference
      Scheme Parameter: 0.5
      Propagation Step: 1.3
      Boundary Condition: TBC ?

    • November 12, 2014 at 6:31 pm #15308
      Ravil
      Participant

      For some reason, I’m getting an error (see attached file) when I’m trying to run the scheme from lesson 14. In my opinion, the problem is that I don’t have the required selection “Select Simulation > Calculate 2D Isotropic Simulation” to calculate the scheme in 2D. The error comes up when I’m trying to simulate my scheme in 3D layout…

    • November 12, 2014 at 6:32 pm #15309
      Ravil
      Participant

      attached file here…

      Attachments:

      1. Running-error.jpg

    • November 13, 2014 at 4:55 pm #15550
      Steve Dods
      Participant

      The sample you have was set up to run in 2D. The input plane takes specifications for 2D and 3D simulations separately. If you ask for a 3D simulation, but the input for a 3D simulation has not been specified in this project, you get this error.

    • November 13, 2014 at 6:29 pm #15554
      Ravil
      Participant

      ok, I see your point. I just haven’t seen the selection to run my simulation in 2D for some reason… I’ll check it again and let you know about the progress!

    • November 13, 2014 at 9:39 pm #15570
      Ravil
      Participant

      Steve, I considered your advice and specified my input in 2D plane. But even after that I have only option to “Calculate 3D Isotropic Simulation” in Simulation tab. Could, you please guide me how exactly should I run my simulation in this case?

    • November 14, 2014 at 3:20 pm #15598
      Steve Dods
      Participant

      I expect you are using the 64 bit version of OptiBPM 12. 2D BPM is found in the 32 bit version of OptiBPM 12. So for now, use the 32 bit version. OptiBPM 13 will have 2D BPM in 64 bits.

    • November 14, 2014 at 10:10 pm #15606
      Ravil
      Participant

      I think I figure it out. Thanks for your advices!

    • November 14, 2014 at 10:13 pm #15607
      Ravil
      Participant

      Can you, please, comment on my questions about the simulation parameters?

    • November 17, 2014 at 3:57 pm #15704
      Steve Dods
      Participant

      There is no reference for Lesson 14. It is not a simulation that reproduces results from a previously published work. That simulation was done by Optiwave.

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