Crosstalk suppression of a balanced bridge interferometric-type LiNbO 3 optical switch by using mach-zehnder structures

Akito Chiba, Tetsuya Kawanishi, Takahide Sakamoto, Kaoru Higuma, Masayuki Izutsu

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Crosstalk in a balanced bridge interferometric-type optical switch is highly suppressed by using Mach-Zehnder (MZ) structures as intensity trimmers. An imbalance in optical power is caused by deviations from the ideal dividing ratio of directional couplers in the switch, which causes an increase in the crosstalk. This imbalance was compensated for by adjusting the transmittances of the nested MZ structures. A crosstalk of less than -55 dB has been achieved even for alternating voltage signals. It is also shown that the crosstalk reduction is possible for a control voltage signal of more than 10 GHz, which is based on double-sideband suppressed-carrier modulation spectra measurement results.

Original languageEnglish
Pages (from-to)872-874
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number10
Publication statusPublished - 2008 May 15
Externally publishedYes


  • Integrated optics
  • Lithium compounds
  • Optical crosstalk
  • Optical directional couplers (DCs)
  • Optical planar waveguides
  • Optical switches

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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