HYSTERISIS IN DC BIAS DRIFT OF LINBO3 OPTICAL MODULATORS

The dc drift of LiNbO3 (LN) optical intensity modulators is experiment ally investigated from the viewpoint of the repeatability of the pheno menon. The drift has been assumed to be reversible and be independent of the magnitude of the applied de bias. However, a bias voltage depen dency of the de drift is experimentally manifested here, especially un der a high bias voltage. By an iterative de bias application for the s ame LN modulator, the drift rate is increased, and a hysterisis appear s in the drift/recovery cycles.