V-Number & Mode Calculator

Calculate V-number, number of guided modes, mode field diameter, and cutoff wavelength for step-index and graded-index optical fibers.

Fiber Preset
Fiber Parameters
Profile Type
V-Number
V
2.33
Mode regime
Single-mode
V < 2.405 — single-mode operation
Mode Field Diameter
MFD (Marcuse)
9.2\u00b5m
Cutoff Wavelength
\u03bb\u2082 (cutoff)
1500nm
Abridged Optics — V-Number & Mode Calculator v1.0V = \u03c0d\u00b7NA/\u03bb. Single-mode: V < 2.405. MFD via Marcuse approximation.

All information, equations, and calculations have been compiled and verified to the best of our ability. For mission-critical applications, we recommend independent verification of all values. If you find an error, please let us know.