Electro-optic SSB modulator with 90° hybrid directly prepared onto LiNbO3 substrate

A. Enokihara, K. Kawamura, T. Nakao, K. Yamamoto, T. Kawai, T. Kawanishi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Optical single-sideband (SSB) modulation is theoretically realised by applying two modulation signals with a 90° phase difference to the dual-electrode type electro-optic (EO) modulator. A branch-line coupler (BC) as the microwave 90° hybrid was directly prepared on the EO modulator substrate, LiNbO3, to create two modulation signals from a single input signal. Output ports of the BC were connected to the modulation electrodes on the substrate. Thereby, an EO optical SSB modulator was realised with a single-tip and a smallsized configuration. The SSB modulator was designed and fabricated for around 10 GHz modulation frequency and 1550 nm light wavelength. The optical SSB modulation operation with a sideband suppression ratio of more than 20 dB was confirmed by the experiment.

Original languageEnglish
Pages (from-to)1237-1238
Number of pages2
JournalElectronics Letters
Issue number19
Publication statusPublished - 2013 Sept 12
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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