High-speed versatile optical modulator based on integrated LiNbO 3 waveguides

Tetsuya Kawanishi*

*この研究の対応する著者

研究成果: Conference contribution

抄録

Various advanced modulation formats, such as on-off-keying (OOK) with carving techniques, phase-shift-keying (PSK), frequency-shin-keying (FSK), etc, were investigated to obtain enhanced spectral efficiency or receiver sensitivity. Orthogonal modulation techniques with OOK and FSK or OOK and PSK are also useful for optical labeling in packet systems. Recently, we reported a versatile optical modulator consisting of a main Mach-Zehnder interferometer (MZI) which has two sub MZIs embedded in the two arms of the main MZI. The modulator can generate return-to-zero (RZ) OOK, binary phase-shift-keying (BPSK), quadrature phase-shift-keying (QPSK), wideband FSK, continuous-phase FSK, etc. By using this modulator, we demonstrated optical DQPSK modulation at 80Gbit/s. For QPSK modulation, two data signals are applied to the two sub MZ structures, to achieve control of in-phase and quadrature components. The versatile modulator can be also used for ultra high extinction ratio (ER) intensity modulation. The sub MZIs in the main MZI can compensate imbalance between the arms of the main MZI, where the imbalance is mainly due to fabrication error. The ER can be higher than 70dB. By using this technique, we can generate super stable two-tone lightwaves, where we can achieve large spurious suppression ration higher than 40dB.

本文言語English
ホスト出版物のタイトルActive and Passive Optical Components for Communications VII
DOI
出版ステータスPublished - 2007 12月 1
外部発表はい
イベントActive and Passive Optical Components for Communications VII - Boston, MA, United States
継続期間: 2007 9月 102007 9月 12

出版物シリーズ

名前Proceedings of SPIE - The International Society for Optical Engineering
6775
ISSN(印刷版)0277-786X

Other

OtherActive and Passive Optical Components for Communications VII
国/地域United States
CityBoston, MA
Period07/9/1007/9/12

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学

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