Typical values for the effective numerical aperture NAe<sup>2<sup>

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.

Manufacturer	Fiber Type	Nominal NA	Effective NAe2	Accuracy	Wavelength
Polarization-maintaining:
Nufern	PM-S405-XP	0.12	0.07	± 0.007	405 nm
Nufern	PM460-HP	0.12	0.08	± 0.008	460 nm
Fujikura	SC48-PS		0.06	± 0.006	480 nm
Nufern	PM630-HP	0.12	0.08	± 0.008	630 nm
Nufern	PM-S630-HP	0.12	0.08	± 0.008	630 nm
Nufern	PM780-HP	0.12	0.08	± 0.008	780 nm
Nufern	PM980-XP	0.12	0.08	± 0.008	980 nm
Nufern	PM1300-XP	0.12	0.08	± 0.008	1300 nm
Nufern	PM1550-XP	0.13	0.08	± 0.008	1550 nm

Single-mode:
Fibercore	SM300	0.12 - 0.14	0.09	± 0.009	375 nm
Nufern	S405-XP	0.12	0.07	± 0.007	405 nm
Fibercore	SM450	0.10 - 0.14	0.07	± 0.007	450 nm
Nufern	S630-HP	0.12	0.08	± 0.008	630 nm
Nufern	630-HP	0.13	0.08	± 0.008	630 nm
Nufern	780-HP	0.13	0.09	± 0.009	780 nm
Corning	HI1060	0.14	0.09	± 0.009	1060 nm
Corning	SMF-28	0.14	0.08	± 0.008	1550 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).

Typical effective Numerical Apertures

Effective Numerical Aperture

Typical Values for the effective numerical Aperture