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Typical effective Numerical Apertures

Effective Numerical Aperture

Typical Values for the effective numerical Aperture

Please find here some measured (averaged) values for the effective numerical aperture NAe2 for common fibers at their respective cut-off wavelength.

ManufacturerFiber TypeNominal NAEffective NAe2AccuracyWavelength   
Polarization-maintaining:        
NufernPM-S405-XP0.120.07± 0.005  405 nm   
NufernPM460-HP0.120.08± 0.005  460 nm   
NufernPM630-HP0.120.08± 0.005  630 nm   
NufernPM780-HP0.120.08± 0.005  780 nm   
NufernPM980-XP0.120.08± 0.005  980 nm   
NufernPM1300-XP0.120.08± 0.0051300 nm   
NufernPM1550-XP0.130.08± 0.0051550 nm   
         
Single-mode:        
FibercoreSM3000.12 - 0.140.09± 0.005  375 nm   
NufernS405-XP0.120.07± 0.005  405 nm   
FibercoreSM4500.10 - 0.140.07± 0.005  450 nm   
NufernS630-HP0.120.08± 0.005  630 nm   
Nufern630-HP0.130.08± 0.005  630 nm   
Nufern780-HP0.130.09± 0.005  780 nm   
CorningHI10600.14 0.09± 0.0051060 nm   
CorningSMF-280.140.08± 0.0051550 nm   

When purchasing a fiber from Schäfter+Kirchhoff, the fiber is delivered with more accurate measurements of the effective numerical aperture NAe2. Measurements are perfomed for each fiber batch and for multiple wavelenghts in the working range (instead of just at the cut-off wavelength).