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:
Dec. 03, 1991
Filed:
Jun. 28, 1989
Atsuko Fukushima, Totsuka-ku, Yokohama, JP;
Yasuo Hira, Kanagawa-ku, Yokohama, JP;
Hidemi Sato, Izumi-ku, Yokohama, JP;
Kazumi Kawamoto, Torigaoka, Totsuka-ku, Yokohama, JP;
Kenchi Ito, Totsuka-ku, Yokohama, JP;
Masataka Shiba, Izumi-ku, Yokohama, JP;
Akira Arimoto, Kodaira-shi, JP;
Other;
Abstract
An optical integrated circuit and an optical apparatus used in optical communication or an opto-electronics apparatus such as an optical disk recording apparatus, in which various kinds of aberration caused by wavelength variation of a light source when a semiconductor laser is used as the light source. An aberration correcting grating having such grating pitches as to nearly satisfy the Bragg condition preferably with respect to a certain wavelength of the semiconductor laser beam is used. As a result, lowering of incidence (entrance) and radiation (exit) coupling efficiencies of the grating coupler and aberration such as chromatic aberration can be prevented. Even if a multi-mode semiconductor laser is used as a light source, the characteristics of the optical integrated circuit and optical apparatus do not vary largely.