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 proceedingConference 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 languageEnglish
Title of host publication2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages415-418
Number of pages4
ISBN (Electronic)9784885522901
DOIs
Publication statusPublished - 2014 Dec 19
Event2014 International Topical Meeting on Microwave Photonics, MWP 2014 and the 9th Asia-Pacific Microwave Photonics Conference, APMP 2014 - Sapporo, Japan
Duration: 2014 Oct 202014 Oct 23

Publication series

Name2014 International Topical Meeting on Microwave Photonics / the 9th Asia-Pacific Microwave Photonics Conference, MWP/APMP 2014 - Proceedings

Other

Other2014 International Topical Meeting on Microwave Photonics, MWP 2014 and the 9th Asia-Pacific Microwave Photonics Conference, APMP 2014
CountryJapan
CitySapporo
Period14/10/2014/10/23

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

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  • 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). [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