Title:
OPTICAL MODULATOR
Document Type and Number:
WIPO Patent Application WO/2020/202605
Kind Code:
A1
Abstract:
Provided is an optical modulator that can be driven at lower voltage through the use of differential signal output. An optical modulator in which optical waveguides (21, 22) and a control electrode are formed on a substrate 1 that has an electro-optic effect, the optical waveguides comprising at least one Mach-Zehnder optical waveguide, wherein the optical modulator is characterized in that: the control electrode is provided with two grounding electrodes sandwiching three signal electrodes; the three signal electrodes are constituted by second (S2) and third (S3) signal electrodes that sandwich a first (S1) signal electrode, and have a wiring structure in which one modulation signal (S+) of the differential signal is applied to the first signal electrode, and another modulation signal (S–) thereof is applied to the second and third signal electrodes; and one branch waveguide (21) out of two Mach-Zehnder optical waveguides is disposed between the first and second signal electrodes, and the other branch waveguide (22) is disposed between the first and third signal electrodes.
Inventors:
MIYAZAKI NORIKAZU (JP)
OKAHASHI KOSUKE (JP)
MOTOYA MASAYUKI (JP)
OKAHASHI KOSUKE (JP)
MOTOYA MASAYUKI (JP)
Application Number:
PCT/JP2019/037728
Publication Date:
October 08, 2020
Filing Date:
September 26, 2019
Export Citation:
Assignee:
SUMITOMO OSAKA CEMENT CO LTD (JP)
International Classes:
G02F1/035
Foreign References:
| US8346025B2 | 2013-01-01 | |||
| JP2018205343A | 2018-12-27 | |||
| JP2013007909A | 2013-01-10 | |||
| US20120251029A1 | 2012-10-04 | |||
| JP2014191095A | 2014-10-06 | |||
| US20170184941A1 | 2017-06-29 |
Other References:
JIANG ET AL.: "Experimental Study of Electro-Optic Crosstalk in Parallel Silicon Photonic Mach- Zehnder Modulators", 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), 14 May 2017 (2017-05-14), pages 1 - 2, XP033238560
Attorney, Agent or Firm:
TAMURA Chikashi et al. (JP)
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