Abstract

In this paper, we propose a method for measuring the extinction ratio (ER) of an optical pulse train with a very high ER. The proposed method can be implemented using a simple optical circuit consisting of an optical gate circuit and conventional optical powermeter. The ER is derived from a series of measurements of averaged gate output powers under several specific gate conditions. The proposed method was experimentally validated on an optical pulse train generated by cascaded ${\rm LiNbO}_3$ intensity modulators. We succeeded in measuring an ER exceeding 70 dB, which is very difficult to measure using existing methods with sufficient measurement accuracy. We also discuss the measurement accuracy and limitations of the proposed method based on theory and experiments.

© 2020 Optical Society of America

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