V_d2bV_by_V_Approx

ofiber.V_d2bV_by_V_Approx(V)[source]

Approximate V*d^2(bV)/dV^2 for single mode fiber.

This value is needed to determine the waveguide dispersion. This approximation is for the fundamental mode in the fiber and is good to 1% when 1.4<V<2.4. Approximation by Marcuse (1979)

Parameters:: V – V-parameter of the fiber [–]
Returns:: V*d^2(bV)/dV^2 [–]