Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Core Index

Required number input.

Cladding Index

Required number input.

Numerical aperture of a step-index fiber in air from core and cladding refractive indices. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Numerical Aperture

The resulting numerical aperture returned as a number.

• Fiber loss and dispersion depend on wavelength, fiber type, launch conditions, connectors, splices, bends, temperature, bandwidth, and nonlinear effects. A link budget needs explicit transmitter, receiver, aging, and engineering margins.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Fiber Cutoff Wavelength

  LP11 cutoff wavelength of an ideal weakly guiding step-index fiber, using V=2.405.

• OTDR Distance

  Convert optical time-domain reflectometer round-trip delay to one-way fiber distance using its group refractive index.

• Rectangular Magnetic Path Length

  Estimate mean magnetic path length around a rectangular core centerline as 2(width+height). Use centerline dimensions, not external package dimensions; corners and air gaps are not corrected.