US 11,982,888 B2
Nonreciprocal waveguide, isolator, optical switch, optical transceiver, data center, and manufacturing method
Reona Motoji, Yokohama (JP); and Tomoya Sugita, Machida (JP)
Assigned to KYOCERA Corporation, Kyoto (JP)
Filed by KYOCERA Corporation, Kyoto (JP)
Filed on May 26, 2022, as Appl. No. 17/804,261.
Claims priority of application No. 2021-089448 (JP), filed on May 27, 2021.
Prior Publication US 2022/0382084 A1, Dec. 1, 2022
Int. Cl. G02F 1/095 (2006.01); G02B 6/12 (2006.01); G02B 6/27 (2006.01); G02F 1/09 (2006.01)
CPC G02F 1/0955 (2013.01) [G02B 6/2746 (2013.01); G02F 1/093 (2013.01); G02B 2006/12157 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A nonreciprocal waveguide comprising:
a substrate;
a light propagation path that is positioned at the substrate along a substrate surface;
a magnetic member that is positioned at the substrate along part of the light propagation path in a longitudinal direction;
an insulating layer that is positioned at the substrate, the insulating layer containing the light propagation path and the magnetic member; and
a mask inside the insulating layer that is positioned further away from the substrate than the light propagation path from the substrate, and
as seen from a direction perpendicular to the substrate surface, the mask overlapping at least part of the light propagation path in a width direction from a side of the light propagation path opposite to the magnetic member in the width direction and positioned in at least a range in which the magnetic member is positioned in the longitudinal direction.