Compact electro-optic single sideband modulators utilizing miniaturized branch-line couplers on LiNbO<inf>3</inf> substrate

Katsuyuki Yamamoto, Tadashi Kawai, Akira Enokihara, Tetsuya Kawanishi

研究成果: Article

抜粋

Optical single sideband (SSB) modulation with theMach- Zehnder (MZ) interferometer was realized by integrating the modulation electrode with the branch-line coupler (BLC) as a 90-degree hybrid onto the modulator substrate. In this paper, BLCs of the microsrtip-line structure were miniaturized on modulator substrates, LiNbO<inf>3</inf> (LN), to realize more compact optical SSB modulators. We introduced two techniques of miniaturizing the BLC, one is using periodically installed open-circuited stabs and the other is installing series capacitors. Compared with a conventional pattern of the BLC, an area of the miniaturized BLC by using periodically installed open-circuited stubs was reduced to about 50%, and that by installing series capacitors was done to about 60%. The operation of these miniaturized BLCs was experimentally confirmed as the 90-degree hybrid at around 10GHz. Output ports of each miniaturized BLC were directly connected with the modulation electrode on the modulator substrate. Thereby, we fabricated two types of compact SSB modulators for 1550nm light wavelength. In the experiments, the optical SSB modulation was successfully confirmed by the output light spectra and the sideband suppression ratio of more than 30dB were observed.

元の言語English
ページ(範囲)769-776
ページ数8
ジャーナルIEICE Transactions on Electronics
E98C
発行部数8
DOI
出版物ステータスPublished - 2015 8 1
外部発表Yes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

フィンガープリント Compact electro-optic single sideband modulators utilizing miniaturized branch-line couplers on LiNbO<inf>3</inf> substrate' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

  • これを引用