Mach-Zehnder optical modulator integrated with tunable multimode interference coupler of Ti:LiNbO3 waveguides for controlling modulation extinction ratio

Anna HIRAI; Yuichi MATSUMOTO; Takanori SATO; Tadashi KAWAI; Akira ENOKIHARA; Shinya NAKAJIMA; Atsushi KANNO; Naokatsu YAMAMOTO

doi:10.1587/transele.2021ECS6018

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

Mach-Zehnder optical modulator integrated with tunable multimode interference coupler of Ti:LiNbO₃ waveguides for controlling modulation extinction ratio

Anna HIRAI, Yuichi MATSUMOTO, Takanori SATO, Tadashi KAWAI, Akira ENOKIHARA, Shinya NAKAJIMA, Atsushi KANNO, Naokatsu YAMAMOTO

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Keywords: Multimode Interference (MMI), Optical Modulator, Optical coupler, Titanium diffused LiNbO₃, Tuning, Extinction ratio, Optical single-sideband (SSB) modulation

JOURNAL RESTRICTED ACCESS Advance online publication

Article ID: 2021ECS6018

DOI https://doi.org/10.1587/transele.2021ECS6018

The final version of this article is now available: Vol. E105.C (2022), No. 8 pp. 385-388

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Abstract

A Mach-Zehnder optical modulator with the tunable multimode interference coupler was fabricated using Ti-diffused LiNbO₃. The modulation extinction ratio could be voltage controlled to maximize up to 50 dB by tuning the coupler. Optical single-sideband modulation was also achieved with a sideband suppression ratio of more than 30 dB.

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