What does the "effective core area" of a fibre (or fiber) optic mean?
Ostensibly, it is the area of a fiber bundle through which the light is actually transmitted as opposed to the structure and gaps between individual fibers in which light is not transmitted.
You mean cross-sectional area?
If so, to find this quantity it would be governed by your input beam width I assume, since the physical core area will be larger than the effective core area?
If my above comments are right, then do I need to find the FWHM of my beam and use that to calculate the cross sectional area?
My initial thought on "effective core area" seems incorrect. The following talk about "effective core area of one fiber", but I believe my thought on the cross-sectional area that transmits light as opposed to the structural or physical fiber cross-sectional area as being the "effective core area" seems correct.
Bismuth-based optical fiber
See this discussion regarding core area.
2.3. Effective Cross-sectional Area (maybe effective core area)
This might be of interest, but one has to buy it.
Enlargement of effective core area on dispersion flattened fiberand its low nonlinearity
Relationship between nonlinear effective core area and backscattering capture fraction for single mode optical fibres
R. H. Stolen, "Relation between the effective area of a single-mode fiber and the capture fraction of spontaneous Raman scattering ," J. Opt. Soc. Am. B 19, 498-501 (2002)
A reference in this matter if found in -
G. P. Agrawal, Nonlinear fiber optics, San Diego: Academic Press, 1995
Then again someone here should have the answer - Professor Agrawal's Nonlinear Fiber Optics Group
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