Title:
OPTICAL WAVEGUIDE ELEMENT, AND OPTICAL TRANSMISSION APPARATUS AND OPTICAL MODULATION DEVICE USING SAME
Document Type and Number:
WIPO Patent Application WO/2023/032050
Kind Code:
A1
Abstract:
Provided is an optical waveguide element comprising an optical waveguide and a spot size conversion unit that connects thereto, the optical waveguide element suppressing propagation loss more than in a case where an insulating layer covering the optical waveguide is provided. This optical waveguide element comprises an optical waveguide 2 formed on a substrate 1, and a spot size conversion unit SSC that is on at least one end of the optical waveguide 2 and changes the mode field diameter of light waves propagating through the optical waveguide. The optical waveguide element is characterized by comprising an insulating layer IL covering at least the upper surface of the optical waveguide, and having the insulating layer IL continuously disposed along the optical waveguide up to the spot size conversion unit SSC.
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Inventors:
OKAHASHI KOUSUKE (JP)
KATAOKA YU (JP)
KATAOKA YU (JP)
Application Number:
PCT/JP2021/032007
Publication Date:
March 09, 2023
Filing Date:
August 31, 2021
Export Citation:
Assignee:
SUMITOMO OSAKA CEMENT CO LTD (JP)
International Classes:
G02B6/122
Foreign References:
| JP2015184528A | 2015-10-22 | |||
| JP2020134689A | 2020-08-31 | |||
| CN111399118A | 2020-07-10 | |||
| JP2021050409A | 2021-04-01 | |||
| JP2020165004A | 2020-10-08 |
Other References:
LI YING, LAN TIAN, LI JING, WANG ZHIYONG: "High-efficiency edge-coupling based on lithium niobate on an insulator wire waveguide", APPLIED OPTICS, OPTICAL SOCIETY OF AMERICA, US, vol. 59, no. 22, 1 August 2020 (2020-08-01), US , pages 6694, XP093042015, ISSN: 1559-128X, DOI: 10.1364/AO.395897
QI YIFAN, LI YANG: "Integrated lithium niobate photonics", NANOPHOTONICS, DE GRUYTER, DE, vol. 9, no. 6, 1 June 2020 (2020-06-01), DE , pages 1287 - 1320, XP093042016, ISSN: 2192-8606, DOI: 10.1515/nanoph-2020-0013
QI YIFAN, LI YANG: "Integrated lithium niobate photonics", NANOPHOTONICS, DE GRUYTER, DE, vol. 9, no. 6, 1 June 2020 (2020-06-01), DE , pages 1287 - 1320, XP093042016, ISSN: 2192-8606, DOI: 10.1515/nanoph-2020-0013
Attorney, Agent or Firm:
TAMURA Chikashi et al. (JP)
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