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:
Aug. 30, 2005
Filed:
Sep. 13, 2001
Takayuki Mizuno, Mito, JP;
Tsutomu Kitoh, Mito, JP;
Yasuyuki Inoue, Mito, JP;
Yoshinori Hibino, Mito, JP;
Mikitaka Itoh, Mito, JP;
Takashi Saida, Mito, JP;
Yasuhiro Hida, Hitachinaka, JP;
Takayuki Mizuno, Mito, JP;
Tsutomu Kitoh, Mito, JP;
Yasuyuki Inoue, Mito, JP;
Yoshinori Hibino, Mito, JP;
Mikitaka Itoh, Mito, JP;
Takashi Saida, Mito, JP;
Yasuhiro Hida, Hitachinaka, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
A planar lightwave circuit is provided. The planar lightwave circuit includes a waveguide and a spotsize converter which is a part of the waveguide, wherein a core is embedded in a cladding in the waveguide, and the spotsize converter is located near an end face of a substrate on which the planar lightwave circuit is formed, the spotsize converter including: a core width fine-tuning part in an end face side of the substrate; and a core width converting part which follows the core width fine-tuning part; wherein core width of the spotsize converter is minimum at an end face of the substrate, a mean taper angle θof the core width fine-tuning part is larger than 0° and smaller than a mean taper angle θof the core width converting part.