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tutorial model - step index fibre

Posted Jan 26, 2011, 7:49 a.m. EST RF & Microwave Engineering 3 Replies

Rekha Thomas
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I am a beginner in comsol. could you please explain how the electric field pattern is being displayed even when we are not giving any input to the fibre.... is it just assuming a field..?
3 Replies Last Post Mar 23, 2017, 5:01 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Jan 29, 2011, 11:57 a.m. EST
Hi

I believe it's sufficient and correct to say that it is because you are doing a "modal analysis".

It's the same for a structural beam, fixed at one end end free elsewhere.

When you do an eigenfrequency analysis (or a mode analysis in optics) you get the eigenmodes, that are the "shapes" of the fields for stable modes (but not any correct useful amplitudes info, these are normalised)

--
Good luck
Ivar
Hi I believe it's sufficient and correct to say that it is because you are doing a "modal analysis". It's the same for a structural beam, fixed at one end end free elsewhere. When you do an eigenfrequency analysis (or a mode analysis in optics) you get the eigenmodes, that are the "shapes" of the fields for stable modes (but not any correct useful amplitudes info, these are normalised) -- Good luck Ivar
ed iskander
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Posted: 1 decade ago Jul 12, 2011, 10:37 p.m. EDT
Dear Sir,

I am absolutely new to COMSOL. I would like to model the spatial
modes (and eventually the dispersion) of a simple step index optical
fiber (with classic core/cladding/jacket construction). How can I do this
using COMSOL please? My optical fiber consists of silica glass and
I have numerical values for the sizes of the core and cladding. Thanks
ever so much for your help!

Cheers,
-Ed
ediskander@hotmail.com
Dear Sir, I am absolutely new to COMSOL. I would like to model the spatial modes (and eventually the dispersion) of a simple step index optical fiber (with classic core/cladding/jacket construction). How can I do this using COMSOL please? My optical fiber consists of silica glass and I have numerical values for the sizes of the core and cladding. Thanks ever so much for your help! Cheers, -Ed ediskander@hotmail.com
Mahmood Waqas
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Posted: 8 years ago Mar 23, 2017, 5:01 a.m. EDT
Dear Ivar,
Which physics interface do you recommend for the study of effective index, dispersion, and confinement losses versus wavelength in a PCF? Besides, which component of E-field should it be solve for? Three components vector or in-plane vectors?
Dear Ivar, Which physics interface do you recommend for the study of effective index, dispersion, and confinement losses versus wavelength in a PCF? Besides, which component of E-field should it be solve for? Three components vector or in-plane vectors?

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