Thus, even if each local channel has a finite linearly polarized component, the far -field DLP vanishes in the C3-symmetric limit because the three contributions cancel exactly

The C3-symmetric case The three local polarization axes are related by 120° rotations, φj = φ0 + 2π(j−1)/3, j = 1, 2, 3, the three channels have identical weights, w1 = w2 = w3