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Index Modulation

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(joined May 2019)
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Hi everyone,
In optigrating software,When we define the parameters of the grating, we can see the Ind.Mod. option in the Grating Definition dialog box. And in the use guide, we can see the official definition:
Ind. Mod. In the Index Modulation box, you define the amplitude of the index modulation of the grating.
So i want to know how to calculate the index modulation(Ind.Mod), and how the index modulation affect the transmission spectrum.
Thank you all!

Responses (1):

    • #62608
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      flying lingcod
      Participant

      Hi everyone,
      In optigrating software,When we define the parameters of the grating, we can see the Ind.Mod. option in the Grating Definition dialog box. And in the use guide, we can see the official definition:
      Ind. Mod. In the Index Modulation box, you define the amplitude of the index modulation of the grating.
      So i want to know how to calculate the index modulation(Ind.Mod), and how the index modulation affect the transmission spectrum.
      Thank you all!

    • #63020

      Hi,
      Index modulation affects both the bandwidth and amplitude response of the grating. You may have a look at “Coupled-mode theory for guided-wave optics” by Yariv or coupled mode theory in any text book, e.g. Photonics by Yariv & Yeh, for details and quantitative analysis.

      Kind regards,
      Amin

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