Optical arithmetic device

Patent metadata

Field	Value
Publication number	US-12429706-B2
Application number	US-202217925518-A
Country	US
Kind code	B2
Filing date	Jan 27, 2022
Priority date	Feb 18, 2021
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

An optical computing device includes: one or more light-diffraction elements each of which includes microcells, wherein each of the microcells has an individually set thickness or refractive index; and an optical signal input section that simultaneously inputs an optical signal and a delayed optical signal obtained by delaying the optical signal to the one or more light-diffraction elements.

First claim

The invention claimed is:

1. An optical computing device comprising:
one or more light-diffraction elements, each of which includes microcells, wherein each of the microcells has an individually set thickness or refractive index; and
an optical signal input section that simultaneously inputs an optical signal and a delayed optical signal obtained by delaying the optical signal to the one or more light-diffraction elements.

2. The optical computing device according to claim 1 , wherein the optical signal input section:
divides an optical path through which the optical signal is transmitted into a first optical path having a first length and a second optical path having a second length longer than the first length, and
inputs the optical signal outputted through the first optical path and the delayed optical signal outputted through the second optical path to the one or more light-diffraction elements.

3. The optical computing device according to claim 2 , further comprising:
a high-refractive index member including a material higher in refractive index than air and disposed in the second optical path.

4. The optical computing device according to claim 2 , wherein the second optical path is longer than the first optical path in a real-space length, and is filled with a medium lower than or equal to air in refractive index.

5. The optical computing device according to claim 2 , wherein the optical signal input section comprises a half mirror disposed in the optical path and divides a transmission path of the optical signal into the first optical path and the second optical path.

6. The optical computing device according to claim 1 , wherein the optical signal input section:
displays images of respective frames different from each other, the images being included in a single moving image, and
inputs each of the images to corresponding one of the one or more light-diffraction elements.

7. The optical computing device according to claim 1 , wherein the optical signal input section comprises a delay amount adjusting section that changes a delay amount between the optical signal and the delayed optical signal.

8. The optical computing device according to claim 7 , wherein the delay amount adjusting section comprises:
an optical stage that moves a position of a table; and
two mirrors disposed on a surface of the table.

9. The optical computing device according to claim 1 , wherein at least one of the one or more light-diffraction elements causes interference between the optical signal and the delayed optical signal that have passed through the at least one of the one or more light-diffraction elements.

10. An optical computing method comprising:
delaying a part of an optical signal to generate a delayed optical signal; and
simultaneously inputting the optical signal and the delayed optical signal to one or more light-diffraction elements, wherein each of the one or more light-diffraction elements includes microcells each having an individually set thickness or refractive index.

11. The optical computing method according to claim 10 , further comprising:
after the simultaneous inputting of the optical signal and the delayed optical signal, causing interference between the optical signal and the delayed optical signal that have passed through at least one of the one or more light-diffraction elements.

Assignees

• Fujikura Ltd

Inventors

• Kusaka Hiroyuki
• Kashiwagi Masahiro

Classifications

• G06E3/00

  Devices not provided for in group G06E1/00, e.g. for processing analogue or hybrid data · CPC title

• G02B27/4272

  having plural diffractive elements positioned sequentially along the optical path · CPC title

• G06E3/001

  Analogue devices in which mathematical operations are carried out with the aid of optical or electro-optical elements · CPC title

• G02B17/023

  for extending or folding an optical path, e.g. delay lines · CPC title

• G02B5/1866

  Transmission gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials (G02B5/1809, G02B5/1828, G02B5/1833, G02B5/1838 and G02B5/1847 take precedence) · CPC title