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:
May. 24, 2005
Filed:
Dec. 24, 2002
Ming LI, Chelmsford, MA (US);
Makoto Ishizuka, Belmont, MA (US);
Daniel Hogan, Acton, MA (US);
Xinbing Liu, Acton, MA (US);
Ming Li, Chelmsford, MA (US);
Makoto Ishizuka, Belmont, MA (US);
Daniel Hogan, Acton, MA (US);
Xinbing Liu, Acton, MA (US);
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A photonic crystal comprising a waveguide made of material. The waveguide has a periodic set of holes. The material proximate to at least one of the holes in the periodic set of holes exhibits an index of refraction that has been modified by the application of laser energy relative to the material proximate to other holes in the periodic set of holes. The photonic crystal is tuned to temporarily transmit a specific wavelength of light to create an on-off switch for the specific wavelength. Multiple photonic crystals are used to form a multiplexer and a demultiplexer.