In order to produce a value of Δβ (as determined in Problem 8.1) that is necessary for complete cancellation, what change in index of refraction in one waveguide (Δng) would be required? Given your...

In order to produce a value of Δβ (as determined in Problem 8.1) that is necessary for complete cancellation, what change in index of refraction in one

waveguide (Δng) would be required? Given your answer in terms of an expression in which the parameters are wavevectors (k) and coupling length (L).