Fig. 6: Relative power in the frequency components corresponding to the fundamental, third-order intermodulation distortion, IMD3, and fifth-order intermodulation distortion, IMD5, as a function of bias phase for the MRM.
From: Addressing optical modulator non-linearities for photonic neural networks

(a) a = t = 0.95, phase modulation amplitude = π/8000; (b) a = 0.95, t = 0.80, phase modulation amplitude = π/8000; (c) a = t = 0.95, phase modulation amplitude =π/100.