Review of Bias Point Stabilization Methods for IQ Modulator

The main sub-device of In-phase and Quadrature (IQ) modulator is Mach-Zehnder Modulator (MZM) based on LiNbO3 crystals, and the susceptibility of LiNbO3 material to external environment such as temperature and device aging will lead to changes in the intrinsic properties of MZM, which will degrade the quality of optical signal originally biased at a specific voltage. In order to ensure the effective transmission of signals in optical communication systems, this paper summarized the bias point stabilization control method for IQ modulators in optical communication systems.