Numerical aperture of single-mode photonic crystal fibers

Numerical aperture of single-mode photonic crystal fibers

We consider the problem of radiation into free space from the end-facet of a single-mode photonic crystal fiber (PCF). We calculate the numerical aperture NA = sin /spl theta/ from the half-divergence angle /spl theta/ /spl sim/ tan/sup -1/ (/spl lambda///spl pi//spl omega/) with /spl pi//spl omega/...

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Veröffentlicht in:IEEE photonics technology letters 2002-08, Vol.14 (8), p.1094-1096
Hauptverfasser: Mortensen, N.A., Folken, J.R., Skovgaard, P.M.W., Broeng, J.
Format: Artikel
Sprache:eng
Schlagworte:
Accuracy
Apertures
Crystal fibers
Equations
Fiber technology
Jacobian matrices
Light scattering
Mathematical analysis
Numerical aperture
Optical fibers
Optical scattering
Particle scattering
Photonic crystal fibers
Photonic crystals
Photonics
Silicon compounds
Size control
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Beschreibung
Zusammenfassung:We consider the problem of radiation into free space from the end-facet of a single-mode photonic crystal fiber (PCF). We calculate the numerical aperture NA = sin /spl theta/ from the half-divergence angle /spl theta/ /spl sim/ tan/sup -1/ (/spl lambda///spl pi//spl omega/) with /spl pi//spl omega//sup 2/ being the effective area of the mode in the PCF. For the fiber first presented by Knight et al. (1996), we find a NA /spl sim/ 0.07 which compares to standard fiber technology. We also study the effect of different hole sizes and demonstrate that the PCF technology provides a large freedom for NA engineering. Comparing to experiments we find good agreement.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2002.1021980