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Multimode Fiber Emission

  • August 20, 2020
  • 4 replies
  • 1630 views

Larry
  • Single Emitter
  • 2 replies

I would like to model the emission from a multimode optical fiber.

I found examples in the Knowledge Base on how to calculate fiber coupling efficiency using physical optics. However, I instead would like to find a way to look at the emission pattern of a multimode fiber using Zemax. A multimode calculation would be onerous. But this output could instead be treated more simply as a total internal reflection within a long glass rod. Can Zemax handle that?

In particular, I want to get a uniform output, which is known to depend on the entrance angle of the light coupled into the fiber, as shown below. I wish to calculate these patterns. 

Thanks,

-Larry

 

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4 replies

Ali H
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  • Visible
  • 32 replies
  • August 20, 2020

Hi Larry,

I would suggest using the Geometric Image Analysis feature or Non-Sequential mode. In the following Knowledgebase article, using the Geometric Image Analysis option is discussed:

https://my.zemax.com/en-US/Knowledge-Base/kb-article/?ka=KA-01351

In your case, I think using Non-Sequential mode would more suitable. I would recommend taking a look at the fiber sample files that come with OpticStudio. There are located in the following location:

\Documents\Zemax\Samples\Non-sequential

For example:

Best,

Ali


Larry
  • Author
  • Single Emitter
  • 2 replies
  • August 20, 2020

Can I get the Zemax file for the above illustration? That is exactly what I'm trying to do. 

I have Zemax Professional 22.2 and can do either approach, Non-Seq or Geometric. 

Thanks,

 


Forum|alt.badge.img+1
  • Ultraviolet
  • 42 replies
  • August 20, 2020

Hi Larry,

I have attached the file here. 

It is also included in your OpticStudio download under Zemax\Samples\Non-Sequential\Fibers\Light Pipe.ZMX.

-Kaleb


Larry
  • Author
  • Single Emitter
  • 2 replies
  • August 20, 2020

OK, the trick is to search under 'Light Pipe' rather than 'Multimode Fiber.' I now see a lot of subjects on this. Thanks. 


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