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.

First vacuum wavelength (nm)

Required number input.

Second vacuum wavelength (nm)

Required number input.

Find absolute optical frequency separation of two wavelength-division multiplexing channels from their vacuum wavelengths. 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]

Optical frequency spacing (Hz)

The resulting optical frequency spacing 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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