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Title:
OPTICAL WAVEGUIDE
Document Type and Number:
WIPO Patent Application WO/2019/117031
Kind Code:
A1
Abstract:
An optical waveguide includes cladding and a core embedded in the cladding. The core comprises: a first incidence surface that is arranged at the end face upstream in the light transmission direction and allows light with a first wavelength to enter the core; a second incidence surface that is arranged at the end face upstream in the transmission direction separate from the first incidence surface by a gap in a direction intersecting with the transmission direction and allows light with a second wavelength shorter than the first wavelength to enter the core; a third incidence surface that is arranged at the end face upstream in the transmission direction separate from the first incidence surface and the second incidence surface by a gap in a direction intersecting with the transmission direction and allows light with a third wavelength shorter than the second wavelength to enter the core; a joint that is arranged downstream of the first incidence surface, the second incidence surface, and the third incidence surface in the transmission direction and where the light with the first wavelength, the light with the second wavelength, and the light with the third wavelength join together; and an emission surface that is arranged downstream from the joint in the transmission direction and wherefrom the light with the first wavelength, the light with the second wavelength, and the light with the third wavelength are emitted. A first area S1 of the first incidence surface, a second area S2 of the second incidence surface, a third area S3 of the third incidence surface are substantially identical. A first attenuation ratio R1 for the light with the first wavelength which is incident on the first incidence surface and emitted from the emission surface is greater than a second attenuation ratio R2 for the light with the second wavelength which is incident on the second incidence surface and emitted from the emission surface. The second attenuation ratio R2 is greater than a third attenuation ratio R3 for the light with the third wavelength which is incident on the third incidence surface and emitted from the emission surface.

Inventors:
KONEGAWA, Naoto (1-2 Shimo-hozumi 1-chome, Ibaraki-sh, Osaka 80, 〒5678680, JP)
TSUJITA, Yuichi (1-2 Shimo-hozumi 1-chome, Ibaraki-sh, Osaka 80, 〒5678680, JP)
Application Number:
JP2018/045069
Publication Date:
June 20, 2019
Filing Date:
December 07, 2018
Export Citation:
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Assignee:
NITTO DENKO CORPORATION (1-2 Shimo-hozumi 1-chome, Ibaraki-shi Osaka, 80, 〒5678680, JP)
International Classes:
G02B6/12; G02B6/122; G02B6/125
Domestic Patent References:
WO2012160980A12012-11-29
Foreign References:
JP2005189385A2005-07-14
US20170038532A12017-02-09
JP2012048036A2012-03-08
JPH11352307A1999-12-24
JP2005077971A2005-03-24
JPH01319707A1989-12-26
Attorney, Agent or Firm:
OKAMOTO, Hiroyuki et al. (Central Shin-Osaka Building 3rd Floor 5-36, Miyahara 4-chome, Yodogawa-ku, Osaka-sh, Osaka 03, 〒5320003, JP)
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