The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 09, 2024
Filed:
Apr. 21, 2020
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Koji Embutsu, Musashino, JP;
Osamu Tadanaga, Musashino, JP;
Takeshi Umeki, Musashino, JP;
Asuka Inoue, Musashino, JP;
Ryoichi Kasahara, Musashino, JP;
Takahiro Kashiwazaki, Musashino, JP;
Nobutatsu Koshobu, Musashino, JP;
Takushi Kazama, Musashino, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Abstract
In a wavelength conversion apparatus, reflection suppressors are provided on surfaces of optical elements indicating lenses, dichroic mirrors, and sealing windows excluding a wavelength conversion element in the apparatus between optical fibers Fand Fon the input side and optical fibers Fand Fon the output side, and on end surfaces of the optical fibers Fand Fon the output side. With this, even when light having a wavelength of a sum frequency component of signal light and excitation light is generated at the operation time of wavelength conversion of the wavelength conversion element, because the reflection suppressors suppress the reflection of unwanted light of the wavelength band, the unwanted light is unlikely to return to the wavelength conversion element and it is also possible to suppress a situation in which the unwanted light is mixed into the optical fibers Fand F