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

Publication
IEICE TRANSACTIONS on Electronics   Vol.E105-C    No.8    pp.385-388
Publication Date: 2022/08/01
Publicized: 2022/02/16
Online ISSN: 1745-1353
DOI: 10.1587/transele.2021ECS6018
Type of Manuscript: BRIEF PAPER
Category: Lasers, Quantum Electronics
Keyword: 
multimode interference (MMI),  optical modulator,  optical coupler,  titanium diffused LiNbO3,  tuning,  extinction ratio,  optical single-sideband (SSB) modulation,  

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Summary: 
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.