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. 15, 2008
Filed:
Dec. 26, 2003
Tsutomu Kitoh, Kanagawa-ken, JP;
Yasuyuki Inoue, Kanagawa-ken, JP;
Mikitaka Ito, Kanagawa-ken, JP;
Yoshinori Hibino, Kanagawa-ken, JP;
Akimasa Kaneko, Shibuya-Ku, JP;
Tsutomu Kitoh, Kanagawa-ken, JP;
Yasuyuki Inoue, Kanagawa-ken, JP;
Mikitaka Ito, Kanagawa-ken, JP;
Yoshinori Hibino, Kanagawa-ken, JP;
Akimasa Kaneko, Shibuya-Ku, JP;
NTT Electronics Corporation, Tokyo, JP;
Nippon Telegraph & Telephone Corporation, Tokyo, JP;
Abstract
An arrayed waveguide grating type optical multiplexer/demultiplexer circuit in which wavelength dispersion is reduced. An input wave guide (), a first slab waveguide (), an arrayed waveguide (), a second slab waveguide () and an output waveguide () are connected sequentially. Furthermore, a parabola waveguide () is provided between the input waveguide () and the first slab waveguide (), and a taper waveguide () is provided between the second slab waveguide () and the output waveguide (). A parabola waveguide length Zexists in a range Z=Z=Zdetermined by a parabola waveguide length Zwhere the ratio of absolute amplitude between the main peak and the first side peak in the field distribution of far-field of the parabola waveguide () has an upper limit of 0.217, and a parabola waveguide length Zwhere the relative phase of the main peak and the first side peak in the field distribution of far-field has a lower limit of 3.14 radian.