Optical modulator evaluation technology based on phase retrieval

摘要

PROBLEM TO BE SOLVED: To estimate an imbalance of electric-optical response between I (quadrature) channel and Q (quadrature phase) channel of an optical quadrature amplitude modulator (optical IQ modulator) by using a simple device. offer. An imbalance of electrical-optical response between an optical detector (PD) 3, an analog-digital converter (ADC) 5, and an I-channel and a Q-channel of an optical orthogonal amplitude modulator (optical IQ modulator). The imbalance calculation unit 11 that estimates Then, using the information about the first modulated signal and the intensity information of the digitized output signal, it has one for estimating the imbalance of the electric-optical response between the I channel and the Q channel of the optical IQ modulator. Estimate the electrical-optical response imbalance between the I and Q channels of the optical IQ modulator. [Selection diagram] Fig. 1