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. 11, 2007
Filed:
Dec. 22, 2005
Hiroyuki Tsuda, Yokohama, JP;
Toshiharu Saiki, Yokohama, JP;
Hiroyuki Tsuda, Yokohama, JP;
Toshiharu Saiki, Yokohama, JP;
Keio University, Minato-ku, Tokyo, JP;
Abstract
In order to provide a low-loss optical switch that is low in power consumption by providing the same as a self-holding type, and high speed and highly practicable, an optical switch of the present invention is composed of a quartz substrate (), first and second input waveguides (and), a first directional coupler (), first and second arm waveguides (and) of a Mach-Zehnder interferometric circuit, a second directional coupler (), first and second output waveguides (and), and a phase change material portion (). A control light (for an amorphous to crystal transition) pulse (pulse width: 20 ns, pulse intensity: 5 mW) having a wavelength of 0.78 microns is irradiated. As a result of the control light pulse irradiation, the phase change material portion () changes in phase to a crystal state, and the optical switch transits to a bar condition.