Fiber Optic Calculator

Calculate optical fiber properties and mode characteristics

Core Refractive Index (n₁):

Cladding Refractive Index (n₂):

Core Radius (μm): (optional)

Wavelength (nm): (optional)

Fiber Length (km): (optional)

About Optical Fibers

Optical fibers guide light through total internal reflection. The fiber properties determine whether it supports single or multiple propagation modes.

Key Parameters:

NA = √(n₁² - n₂²) (numerical aperture)
V = 2πa·NA/λ (V-number)
Single-mode condition: V < 2.405

Typical Values:

Single-mode: core ~9 μm, NA ~0.12
Multimode: core 50-62.5 μm, NA ~0.2