IEICE Transactions on Communications
Online ISSN : 1745-1345
Print ISSN : 0916-8516
Joint Special Section on Opto-electronics and Communications for Future Optical Network
Proposal and Verification of Auto Calibration Technique for Bias Control Circuit Connecting to Built-In Optical Power Monitor in Imperfect IQ-Modulator
Hiroto KAWAKAMIShoichiro KUWAHARAYoshiaki KISAKA
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2020 Volume E103.B Issue 11 Pages 1299-1304

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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 0.5dB with our proposed technique.

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© 2020 The Institute of Electronics, Information and Communication Engineers
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