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:
Sep. 20, 2005
Filed:
Aug. 21, 2003
Takeshi Fukuda, Sakura, JP;
Shimon Ishikawa, Sakura, JP;
Tomoko Fujii, Sakura, JP;
Ken Sakuma, Sakura, JP;
Hideyuki Hosoya, Sakura, JP;
Takeshi Fukuda, Sakura, JP;
Shimon Ishikawa, Sakura, JP;
Tomoko Fujii, Sakura, JP;
Ken Sakuma, Sakura, JP;
Hideyuki Hosoya, Sakura, JP;
Fujikura Ltd., Tokyo, JP;
Abstract
When an optical waveguide is formed by focused femtosecond laser pulses in a pure silica glass to induce a refractive index increase region, a pulse width of femtosecond laser pulses are changed, a peak power of femtosecond laser pulses at the focal point is changed, or both the pulse width and the peak power are changed simultaneously. Under conditions where a pulse width of the femtosecond laser pulses is in a range of 210 to 420 fs and a peak power at the focal point is not greater than 8.7×10W/cm, an optical waveguide having a mode field of 10 to 14 μm such that an aspect ratio is 1 (one) can be obtained. By doing this, it is possible to control a mode field diameter of an optical waveguide and an aspect ratio of the mode field diameter.