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.

Interfering optical power (W)

Required number input.

Wanted optical power (W)

Required number input.

Express unwanted-to-wanted optical power ratio as crosstalk in decibels; negative values mean interference is below the signal. 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]

Crosstalk (dB)

The resulting crosstalk returned as a number.

• WDM spacing and crosstalk depend on the frequency grid, wavelength-to-frequency conversion, filter shape, laser drift, dispersion, nonlinear effects, channel power, insertion loss, and receiver selectivity. Equal wavelength spacing is not equal frequency spacing.
• 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.

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