US 11,817,910 B2
Light-receiving device
Koya Takata, Tokyo (JP); Hiroki Sugiyama, Tokyo (JP); and Fujio Okumura, Kanagawa (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 17/617,351
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Jun. 8, 2020, PCT No. PCT/JP2020/022541
§ 371(c)(1), (2) Date Dec. 8, 2021,
PCT Pub. No. WO2020/250850, PCT Pub. Date Dec. 17, 2020.
Claims priority of application No. 2019-110496 (JP), filed on Jun. 13, 2019.
Prior Publication US 2022/0360341 A1, Nov. 10, 2022
Int. Cl. H04B 10/67 (2013.01); H04B 10/114 (2013.01); G02B 6/42 (2006.01)
CPC H04B 10/671 (2013.01) [G02B 6/4206 (2013.01); H04B 10/1141 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A light-receiving device comprising:
a light guide plate that is a transparent member having, as main surfaces, a first surface and a second surface facing each other and has an emission end formed on at least one end portion of the light guide plate;
a wave plate that is disposed on the first surface of the light guide plate and converts an optical signal of circularly polarized light into linearly polarized light;
a hologram layer that is disposed on the second surface of the light guide plate and guides a traveling direction of the optical signal converted into the linearly polarized light toward the emission end of the light guide plate; and
a light receiver that receives the optical signal emitted from the emission end of the light guide plate and converts the received optical signal into an electrical signal.