Abstract
AbstractLiNbO3 Mach‐Zehnder optical modulators, which are expected to be used for multi‐Gbit/s optical transmission scheme, have one problem which is a dc drift phenomenon. In order to operate this modulator for a long time, a control unit to adjust a bias voltage for such dc drift is therefore necessary. So far, a method to superimpose a control signal with a main signal has been commonly used. However, the control signal may influence the output signal in this method. A novel automatic bias voltage control scheme utilizing the feature of Mach‐Zehnder modulator with traveling‐wave electrodes is proposed in this paper. A dc drift can be detected with a probe light propagating along a direction opposite to that of a modulated voltage waveform, and therefore very little influence of the probe signal on the output signal would be expected. A theoretical discussion on a dc drift detection and control method is described. This method has been successfully demonstrated to work for a mark density of 1/4, 1/2, and 3/4.
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