Analysis of quadrature bias-point drift of Mach-Zehnder electro-optic modulator

The broadband external intensity electro-optic modulating unit is aimed to serve as a vital part of analogue measuring electro-optic system that is under the development at our department. The modulating unit is based on integrated intensity electro-optic modulator of Mach-Zehnder type. Undoubtedly, one of the most severe problems linked with application of the appliance like this seems to be its operating point time-drift. The paper deals with methodology of measurements and evaluation of drift value. Furthermore, prospective necessity of operating point stabilization is discussed here from particular application point of view.