Title:
光方向性結合器
Document Type and Number:
Japanese Patent JP6663145
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an optical directional coupler having no polarization dependency.SOLUTION: Two optical waveguides 1, 2 each having a cross section of 90-degree rotational symmetry are arranged at a predetermined interval such that cross sections have 45-degree mirror symmetry. An interval between facing vertices of the cross sections of the two optical waveguides 1, 2 can have a predetermined length d. The two optical waveguides can have identical cross sections (for example, a square having one side a) and a length L. The two optical waveguides 1, 2 consist of a first optical waveguide and a second optical waveguide provided on a substrate, and the second optical waveguide can be positioned 45 degrees obliquely above the first waveguide. Further, the first optical waveguide is in a first clad layer, having a first refractive index, on the substrate, and the second optical waveguide is in a second clad layer, having the first refractive index, on the first clad layer, the first optical waveguide and second optical waveguide each being able to have a refractive index larger than the first refractive index.SELECTED DRAWING: Figure 1
Inventors:
Keiji Suzuki
Kazuhiro Ikeda
Kawashima Sei
Ken Tanizawa
Kazuhiro Ikeda
Kawashima Sei
Ken Tanizawa
Application Number:
JP2015117755A
Publication Date:
March 11, 2020
Filing Date:
June 10, 2015
Export Citation:
Assignee:
National Institute of Advanced Industrial Science and Technology
International Classes:
G02B6/125; G02B6/28
Domestic Patent References:
| JP2004309807A | ||||
| JP11109159A | ||||
| JP2015219295A | ||||
| JP2015075616A |
Foreign References:
| US20160379677 |
Other References:
FENG et al.,A Three-Dimensional Silicon Nitride Polarizing Beam Splitter,IEEE Photonics Technology Letters,米国,IEEE,2014年 4月 1日,Vol.26 No.7,pp.706-709