[Jing WangParticipant]

you may refer to Lesson 15:

Transmission and Reflection Spectrum from Grating Unit Cell

[Jing WangParticipant]

can you please provide more information on what you want to simulate, like a paper or figure?

[Jing WangParticipant]

Hi Mahmoud,

1. yes, it is able to draw hexagonal shape.
2. transverse modes can be solved for different structure sizes.

[Jing WangParticipant]

hi,

1. when run a project file in Designer, the simulator will be launched.
2. I have no idea due to the insufficient info. you gave.

Regards

[Jing WangParticipant]

there are many basic errors in your project file. you are advised to follow some examples step-by-step first.

[Jing WangParticipant]

when use a Gaussian pulse for a resonator, the no. of time steps should be large enough so that the response in time domain can delay to a very small value (for example, 0.1 % of the peak value).

[Jing WangParticipant]

we only have S-Bend Arc/Sine/Cosine waveguide, as shown in the attchment.

[Jing WangParticipant]

You may refer to Page 41-42 of “OptiFDTD_Technical_Background” for details.

[Jing WangParticipant]

I am afraid I have no idea what is shown there. Could you please describe what happened?

[Jing WangParticipant]

Here is an example for Q factor of PhC cavity:

Photonic Bandgap Micro-cavity in Optical Waveguide

[Jing WangParticipant]

i am afraid fdtd can not give noise in fiber.

[Jing WangParticipant]

It would help for your project if you follow “OptiFDTD_Getting_Started.pdf”.

[Jing WangParticipant]

In previous version of OptiFDTD, there existed 2 options to obtain spectral response – FFT and DFT. The frequency domain sampling step was 1/(2N*Dt) for FFT. For DFT, it gave spectral response for a series of wavelengths which was identified by users. the more selected wavelengths, the slower DFT (FDTD) runs. so a max. number on sampling points (e.g. 200) was set. We removed FFT some time ago and only keep DFT.

[Jing WangParticipant]

no attachment shows.
I am afraid the fitting to dispersive model is only for guys with purchased licenses of OptiFDTD.

[Jing WangParticipant]

Hussein, as indicated in our emails, I am afraid your simulation results are not right.
you performed a CW FDTD, while you were checking the power spectrum for a large wavelength range.