cutoff_wavelength

ofiber.basics.cutoff_wavelength(a, NA, ell=0, q=inf)[source]

Calculate the cutoff wavelength for an optical fiber.

The default operation is for this function to calculate the cutoff wavelength for the fundamental mode of a step-index fiber. The cutoff wavelength for higher order modes may be found by specifying a different value of ell.

If the cutoff wavelength for a graded index fiber is desired, then specify a different value for q.

Parameters:

  • a – radius of the fiber [m]

  • NA – numerical aperture of the fiber [-]

  • ell – (optional) mode number [-]

  • q – (optional) parameter for graded index fiber [-]

Returns:

shortest wavelength for operation in the specified mode [m]