OSA's Digital Library

Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 25, Iss. 7 — Jul. 1, 2007
  • pp: 1805–1810

High-Speed X-Cut Thin-Sheet LiNbO3 Optical Modulator With Folded Structure

Kenji Aoki, Jungo Kondo, Yuichi Iwata, Akira Hamajima, Tetsuya Ejiri, Osamu Mitomi, and Makoto Minakata

Journal of Lightwave Technology, Vol. 25, Issue 7, pp. 1805-1810 (2007)

View Full Text Article

Acrobat PDF (552 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

  • Export Citation/Save Click for help


We propose a small-footprint X-cut thin-sheet LiNbO3 optical modulator with high-speed and low-driving-voltage characteristics. Since an optical waveguide is folded by a mirror placed at one edge of the modulation chip, the chip can be shortened by about half. In addition, a wide modulation bandwidth can be achieved, because the path-length difference between the optical waveguide and the coplanar-waveguide (CPW) electrode is decreased to as short as possible by placing the CPW electrode as far as possible along the optical waveguide in the folded portion, and the microwave effective index is set to realize effective velocity matching between the lightwave and the microwave. A small footprint of 1.78 × 29 mm, a low half-wave voltage of 2.0 V at dc, and a 3-dBe modulation bandwidth of 20 GHz were obtained.

© 2007 IEEE

Kenji Aoki, Jungo Kondo, Yuichi Iwata, Akira Hamajima, Tetsuya Ejiri, Osamu Mitomi, and Makoto Minakata, "High-Speed X-Cut Thin-Sheet LiNbO3 Optical Modulator With Folded Structure," J. Lightwave Technol. 25, 1805-1810 (2007)

Sort:  Year  |  Journal  |  Reset


  1. M. Sugiyama, M. Doi, S. Taniguchi, T. Nakazawa, H. Onaka, "Driver-less 40 Gb/s $\hbox{LiNbO}_{3}$ modulator with sub-1 V drive voltage," Optical Fiber Commun. Conf. AnaheimCA (2002) Paper PD FB6-2.
  2. G. Gilardi, L. Gobbi, A. Beretta, P. Milanese, S. Pensa, D. Pircalaboiu, A. Vannucci, T. Lee, V. Filsinger, M. Martin, "Broadband $\hbox{LiNbO}_{3}$ modulator for digital and analog applications," Proc. MWP (2003) pp. 311-314.
  3. J. Kondo, K. Aoki, A. Kondo, T. Ejiri, Y. Iwata, A. Hamajima, T. Mori, Y. Mizuno, M. Imaeda, Y. Kozuka, O. Mitomi, M. Minakata, "High-speed and low-driving-voltage thin-sheet X-cut $\hbox{LiNbO}_{3}$ modulator with laminated low-dielectric-constant adhesive," IEEE Photon. Technol. Lett. 17, 2077-2079 (2005).
  4. W. K. Burns, M. M. Howerton, R. P. Moeller, A. S. Greenblatt, R. W. McElhanon, "Broad-band reflection traveling-wave $\hbox{LiNbO}_{3}$ modulator," IEEE Photon. Technol. Lett. 10, 805-806 (1998).
  5. H. Miyazawa, O. Mitomi, "Characteristics of $\hbox{LiNbO}_{3}$ optical modulator with reflected optical waveguides," Proc. IEICE Spring Nat. Conv. (1992) pp. 4-246.
  6. M. Sugiyama, M. Doi, F. Futami, S. Watanabe, H. Onaka, "A low drive voltage $\hbox{LiNbO}_{3}$ phase and intensity integrated modulator for optical frequency comb generation and short pulse generation," Eur. Conf. Optical Commun. (ECOC) StockholmSweden (2004) Paper Tu.3.4.2.
  7. H. Chung, W. S. C. Chang, E. L. Adler, "Modeling and optimization of traveling-wave $\hbox{LiNbO}_{3}$ interferometric modulators," IEEE J. Quantum Electron. 27, 608-617 (1991).
  8. K. Aoki, J. Kondo, A. Kondo, T. Mori, Y. Mizuno, S. Shimodaira, M. Imaeda, Y. Kozuka, O. Mitomi, M. Minakata, "High-performance optical modulator with a wide center electrode and thin X-cut $ \hbox{LiNbO}_{3}$ substrate," IEEE Photon. Technol. Lett. 16, 2610-2612 (2004).
  9. O. Mitomi, N. Yoshimoto, K. Magari, T. Ito, Y. Kawaguchi, Y. Suzaki, Y. Tohmori, K. Kasaya, "Analyzing the polarization dependence in optical spot-size converter by using a semivectorial finite-element beam propagation method," J. Lightw. Technol. 17, 1255-1262 (1999).

Cited By

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited