US 12,085,721 B2
Optical waveguide detection element, video laser module, and XR glasses
Hideaki Fukuzawa, Tokyo (JP); Tomohito Mizuno, Tokyo (JP); Tetsuya Shibata, Tokyo (JP); and Tsuyoshi Komaki, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Sep. 26, 2023, as Appl. No. 18/373,007.
Claims priority of application No. 2022-154977 (JP), filed on Sep. 28, 2022.
Prior Publication US 2024/0103277 A1, Mar. 28, 2024
Int. Cl. G02B 6/12 (2006.01); G02B 6/125 (2006.01); G02B 27/00 (2006.01); G02B 27/01 (2006.01); H10N 50/10 (2023.01)
CPC G02B 27/0172 (2013.01) [G02B 6/12004 (2013.01); G02B 6/12007 (2013.01); G02B 6/125 (2013.01); G02B 27/0093 (2013.01); H10N 50/10 (2023.02); G02B 2006/12104 (2013.01); G02B 2027/0178 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical waveguide detection element comprising:
a substrate;
an optical waveguide layer formed on the substrate; and
a photodetector,
wherein the optical waveguide layer includes:
a first optical waveguide in which visible light having a wavelength of 380 nm to 800 nm propagates;
a second optical waveguide in which near-infrared light having a wavelength of 801 nm to 2000 nm propagates; and
a third optical waveguide in which light propagates to a light receiving surface of the photodetector, and
wherein a visible light output port of the first optical waveguide from which the visible light is output, a near-infrared light output port of the second optical waveguide from which the near-infrared light is output, and a reflected light input port of the third optical waveguide to which the near-infrared light is reflected and returned are arranged on one end surface of the optical waveguide layer.