Title:
DIRECTIONAL COUPLER AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/243045
Kind Code:
A1
Abstract:
In an optical power shift part, the distance between first and second optical waveguides (2c, 3c) is less than or equal to the wavelength of light. Each of the first and second optical waveguides (2c, 3c) is a high-mesa structure having a lower cladding layer (5), a core layer (6a, 6b), and an upper cladding layer (7a, 7b) which are formed in order on a semiconductor substrate (1). The first optical waveguide (2c) and the second optical waveguide (3c) have different widths. A gap core layer (6c) is formed on the lower cladding layer (5) between the core layers (6a, 6b) of the first and second optical waveguides (2c, 3c) of the optical power shift part. The equivalent refractive index of the gap core layer (6c) when consideration is given to light leakage in the height direction is lower than the equivalent refractive indexes of the core layers (6a, 6b) of the first and second optical waveguides (2c, 3c).
Inventors:
MOCHIZUKI KEITA (JP)
KISHIMOTO KAZUMASA (JP)
KISHIMOTO KAZUMASA (JP)
Application Number:
PCT/JP2022/024158
Publication Date:
December 21, 2023
Filing Date:
June 16, 2022
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
G02B6/125
Foreign References:
| JP2015197664A | 2015-11-09 | |||
| US20180284347A1 | 2018-10-04 | |||
| CN107765366A | 2018-03-06 | |||
| CN106772801A | 2017-05-31 | |||
| JP2003500690A | 2003-01-07 |
Other References:
YE CHAOCHAO; DAI DAOXIN: "Ultra-Compact Broadband 2 × 2 3 dB Power Splitter Using a Subwavelength-Grating-Assisted Asymmetric Directional Coupler", JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE, USA, vol. 38, no. 8, 13 February 2020 (2020-02-13), USA, pages 2370 - 2375, XP011782283, ISSN: 0733-8724, DOI: 10.1109/JLT.2020.2973663
Attorney, Agent or Firm:
TAKADA, TAKAHASHI & PARTNERS (JP)
Download PDF: