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.

Input Milliwatts (mW)

Required number input.

Output Milliwatts (mW)

Required number input.

Length Kilometers (km)

Required number input.

Average fiber attenuation in decibels per kilometer from launched and received optical power over known length. 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]

Attenuation Db Per Km (dB/km)

The resulting attenuation db per km 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 Nonlinear Phase Shift

  Estimate self-phase modulation accumulated in a fiber from nonlinear coefficient, launched power, and attenuation-adjusted effective length.

• Fiber Attenuation dB

  Compute the total attenuation of an optical fiber link from its loss coefficient and length.

• Power Attenuator dB

  Compute power attenuation in decibels from output and input power.