Calculating Bandwidth-Distance Value [Optical System] [Optical Fiber]

[Damian Marek]

Question:

Which software package is best suited for computing the Bandwidth-Distance value of a graded-index highly multimode fiber?

[Dr Rk Sethi]

Can OptiSystem calculate the Bandwidth-Distance value of a standard single mode fiber?

[Dr. Dhiman Kakati]

Hi Damian,
Where it is most useful to find the Bandwidth-Distance product. Do we need for find characteristic of a system in terms of graph so that we can analyze the behavior of the system..?

Regards,
Dhiman

[SAHIL SINGH]

Hi Damian Marek,

Nice to know that Bandwidth-Distance issues are handled within the OptiSystem… Thanks for providing such useful information…

Regards
Sahil Singh

[Ranjeet Kumar]

Thank you so much Damian Marek sir,
For sharing such important information about Optisystem and OptiFiber.
Sir, Please elaborate the ways i could use OptiFiber in order to calculate modes at various wavelengths and group delays.

Seeking your response.

[Damian Marek]

Answer:

Calculating terms like Bandwidth-Distance are handled within our product OptiSystem.

The division of OptiFiber and OptiSystem is such:

OptiFiber is a component-level device software. It calculates some basic optical properties of a fiber. For example, given the radial refractive index profile and specified materials, it can calculate modes at various wavelengths. It can also calculate group delays and from that deduce modal dispersion. This data can be used by OptiSystem.

OptiSystem is a system level simulator which can work independently or in concert with OptiFiber. You would use this, for example, if you wanted to see how your fiber performed in a communications system. And indeed, Bandwidth-Distance is one of the parameters we calculate. OptiSystem has multi-mode fiber components. I suspect the components most helpful in this case would be our Parabolic-Index Multimode Fiber and our Measured-Index Multimode Fiber. There are a few ways that the refractive index profile can be defined:

1. Parabolic profile (in Parabolic-Index Multimode Fiber)
2. Alpha profile (in Measured-Index Multimode Fiber)
3. External file (in Measured-Index Multimode Fiber) – either a basic data file which specifies various values of index and at what radii they occur, or from an OptiFiber generated file.

Once all the parameters have been defined, OptiSystem will calculate the LP(m,n) modes. In our documentation, it states that the limit is LP(1000,1000), but we can extend that if necessary. The only real limits are computer memory and power.

I have attached the documentation for our Measured-Index Multimode Fiber component. At the bottom of page 8 is the result you are interested in, here just called Bandwidth.

Attachments:

1. MMFiber.pdf

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