US 12,248,207 B2
Isolator, method of manufacturing isolator, electromagnetic wave transmitter, and light transmitter
Hiromichi Yoshikawa, Yokohama (JP); Naoki Matsui, Tokyo (JP); and Tomoya Sugita, Machida (JP)
Assigned to KYOCERA Corporation, Kyoto (JP)
Filed by KYOCERA Corporation, Kyoto (JP)
Filed on Jan. 26, 2024, as Appl. No. 18/424,487.
Application 18/424,487 is a division of application No. 17/597,806, granted, now 11,921,365, previously published as PCT/JP2020/028158, filed on Jul. 20, 2020.
Claims priority of application No. 2019-138296 (JP), filed on Jul. 26, 2019; application No. 2019-138300 (JP), filed on Jul. 26, 2019; application No. 2019-138309 (JP), filed on Jul. 26, 2019; and application No. 2019-138310 (JP), filed on Jul. 26, 2019.
Prior Publication US 2024/0168323 A1, May 23, 2024
Int. Cl. H04B 10/50 (2013.01); G02F 1/095 (2006.01)
CPC G02F 1/0955 (2013.01) [H04B 10/50 (2013.01); H04B 10/501 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An isolator comprising:
a first waveguide, a second waveguide, and a third waveguide that are positioned along a substrate surface of a substrate,
wherein the first waveguide, the second waveguide, and the third waveguide each include a core surrounded by a dielectric,
wherein the first waveguide and the second waveguide include a first coupling portion that forms a first directional coupler that acts on an electromagnetic wave in a first mode,
wherein the first waveguide and the third waveguide include a second coupling portion that forms a second directional coupler that acts on either of an electromagnetic wave in the first mode and an electromagnetic wave in a second mode that is different from the first mode, and
wherein the second waveguide includes a nonreciprocal member adjacent to the core of the second waveguide in the first coupling portion, and thereby the first directional coupler does not couple an electromagnetic wave in a first direction and couples an electromagnetic wave in a second direction that is different from the first direction.