IEICE Transactions on Communications
Online ISSN : 1745-1345
Print ISSN : 0916-8516

This article has now been updated. Please use the final version.

Proposal and verification of auto calibration technique for bias control circuit connecting to built in optical power monitor in imperfect IQ modulator
Hitoro KAWAKAMIShoichiro KUWAHARAYoshiaki KISAKA
Author information
JOURNAL RESTRICTED ACCESS Advance online publication

Article ID: 2019OBP0010

Details
Abstract

We show that imperfection in an IQ-modulator degrades the accuracy of the auto bias control (ABC) circuit connected to the modulator's complementary port. Theoretical analyses show that the IQ -modulator constructed by a nested Mach-Zehnder modulator with a low extinction ratio can distort a constellation of modulated light observed at the complementary port. We propose an auto calibration technique for the ABC circuit that can effectively suppress this degradation. Experimental results using 32-Gbaud, 16-QAM signals showed the measured Q-factor improved by 0.5 dB with our proposed technique.

Content from these authors
© 2020 The Institute of Electronics, Information and Communication Engineers
feedback
Top