Figure 4

The detected normalized intensity when the phase is locked for Logic 1. The stable intensities of D₂ (solid line) and D₁ (dashed line) when locking the phase differences of two big MZIs to be φ ₁ = φ ₂ = 0, giving the result I(D₂)/I ₀ = 65% and I(D₁)/I ₀ = 5%.