LiNbO3 optical SSB modulator using microwave branchline coupler miniaturized by inter-digital capacitors

Katsuyuki Yamamoto; Tadashi Kawai; Akira Enokihara; Tetsuya Kawanishi

doi:10.1109/MWP.2014.6994587

LiNbO₃ optical SSB modulator using microwave branchline coupler miniaturized by inter-digital capacitors

Katsuyuki Yamamoto, Tadashi Kawai, Akira Enokihara, Tetsuya Kawanishi

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Optical single sideband (SSB) modulation can be realized by using a Mach-Zehnder (MZ) interferometer with the branch-line coupler (BC) circuit as a 90 degree hybrid. In this paper, a miniaturized configuration of the BC circuit with installed series capacitors of the inter-digital structure was designed onto an electro-optic (EO) crystal, LiNbO₃, substrate. Compared with a conventional BC, an area of the miniaturized BC was reduced by about 60% and the operation as the 90 degree hybrid was confirmed at around 10 GHz. The BC circuit directly connected with modulation electrodes was designated onto an EO modulator substrate for a single input type optical SSB modulator with a compact configuration. In the experiment, the modulator was fabricated and the optical SSB signal with the sideband suppression ratio of more than 30 dB was observed using light-waves of the 1550 nm region.

Original language	English
Title of host publication	2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	415-418
Number of pages	4
ISBN (Electronic)	9784885522901
DOIs	https://doi.org/10.1109/MWP.2014.6994587
Publication status	Published - 2014 Dec 19
Externally published	Yes
Event	2014 International Topical Meeting on Microwave Photonics, MWP 2014 and the 9th Asia-Pacific Microwave Photonics Conference, APMP 2014 - Sapporo, Japan Duration: 2014 Oct 20 → 2014 Oct 23

Publication series

Name	2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings

Other

Other	2014 International Topical Meeting on Microwave Photonics, MWP 2014 and the 9th Asia-Pacific Microwave Photonics Conference, APMP 2014
Country/Territory	Japan
City	Sapporo
Period	14/10/20 → 14/10/23

Keywords

Lithium niobate
couplers
electro-optic modulators
microwave photonics

ASJC Scopus subject areas

Computer Networks and Communications
Computer Science Applications
Electrical and Electronic Engineering
Electronic, Optical and Magnetic Materials

Access to Document

10.1109/MWP.2014.6994587

Cite this

Yamamoto, K., Kawai, T., Enokihara, A., & Kawanishi, T. (2014). LiNbO₃ optical SSB modulator using microwave branchline coupler miniaturized by inter-digital capacitors. In 2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings (pp. 415-418). Article 6994587 (2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/MWP.2014.6994587

LiNbO₃ optical SSB modulator using microwave branchline coupler miniaturized by inter-digital capacitors. / Yamamoto, Katsuyuki; Kawai, Tadashi; Enokihara, Akira et al.
2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2014. p. 415-418 6994587 (2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Yamamoto, K, Kawai, T, Enokihara, A & Kawanishi, T 2014, LiNbO₃ optical SSB modulator using microwave branchline coupler miniaturized by inter-digital capacitors. in 2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings., 6994587, 2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings, Institute of Electrical and Electronics Engineers Inc., pp. 415-418, 2014 International Topical Meeting on Microwave Photonics, MWP 2014 and the 9th Asia-Pacific Microwave Photonics Conference, APMP 2014, Sapporo, Japan, 14/10/20. https://doi.org/10.1109/MWP.2014.6994587

Yamamoto K, Kawai T, Enokihara A, Kawanishi T. LiNbO₃ optical SSB modulator using microwave branchline coupler miniaturized by inter-digital capacitors. In 2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings. Institute of Electrical and Electronics Engineers Inc. 2014. p. 415-418. 6994587. (2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings). doi: 10.1109/MWP.2014.6994587

Yamamoto, Katsuyuki ; Kawai, Tadashi ; Enokihara, Akira et al. / LiNbO₃ optical SSB modulator using microwave branchline coupler miniaturized by inter-digital capacitors. 2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2014. pp. 415-418 (2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings).

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AB - Optical single sideband (SSB) modulation can be realized by using a Mach-Zehnder (MZ) interferometer with the branch-line coupler (BC) circuit as a 90 degree hybrid. In this paper, a miniaturized configuration of the BC circuit with installed series capacitors of the inter-digital structure was designed onto an electro-optic (EO) crystal, LiNbO3, substrate. Compared with a conventional BC, an area of the miniaturized BC was reduced by about 60% and the operation as the 90 degree hybrid was confirmed at around 10 GHz. The BC circuit directly connected with modulation electrodes was designated onto an EO modulator substrate for a single input type optical SSB modulator with a compact configuration. In the experiment, the modulator was fabricated and the optical SSB signal with the sideband suppression ratio of more than 30 dB was observed using light-waves of the 1550 nm region.

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