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:
Nov. 27, 2007
Filed:
May. 08, 2001
Masao Imaki, Tokyo, JP;
Yoshihito Hirano, Tokyo, JP;
Makoto Satou, Tokyo, JP;
Kenji Masuda, Tokyo, JP;
Akihiro Adachi, Tokyo, JP;
Shinichi Takagi, Tokyo, JP;
Yasunori Nishimura, Tokyo, JP;
Masao Imaki, Tokyo, JP;
Yoshihito Hirano, Tokyo, JP;
Makoto Satou, Tokyo, JP;
Kenji Masuda, Tokyo, JP;
Akihiro Adachi, Tokyo, JP;
Shinichi Takagi, Tokyo, JP;
Yasunori Nishimura, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical signal emitted from a semiconductor laser is converged by a lens and then received by a single uniaxial birefringent crystal having a C axis that is inclined at an angle other than 90 degrees against a laser optical axis to output an optical signal having a polarized wave component of constant intensity corresponding to the wavelength of the optical signal regardless of temperature changes. The optical signal has an ordinary ray vibrating in a direction perpendicular to a plane including both the C axis and the laser optical axis, and an extraordinary ray vibrating in a direction perpendicular to both the ordinary ray and the laser optical axis. A first main photo detector detects the intensity of a p-polarized component of the optical signal that has passed through a polarizer and a second photo detector directly receives the optical signal converged by the lens.