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 Radius Meters (m)

Required number input.

Numerical Aperture

Required number input.

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

Cutoff Meters (m)

The resulting cutoff meters 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 Numerical Aperture

  Numerical aperture of a step-index fiber in air from core and cladding refractive indices.

• Detector Responsivity Vs Wavelength

  Ideal photodetector responsivity from external quantum efficiency and incident wavelength.

• Differentiator Step Peak

  Compute the practical RC differentiator step peak as -Vin x tau / (tau + t_step), where the theoretical ideal peak is unbounded for an instantaneous step.