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:
Mar. 11, 2008
Filed:
Jul. 07, 2005
Morio Wada, Tokyo, JP;
Shinji Iio, Tokyo, JP;
Masayuki Suehiro, Tokyo, JP;
Shinichi Nakajima, Tokyo, JP;
Yoshiyuki Asano, Tokyo, JP;
Tsuyoshi Yakihara, Tokyo, JP;
Akira Miura, Tokyo, JP;
Morio Wada, Tokyo, JP;
Shinji Iio, Tokyo, JP;
Masayuki Suehiro, Tokyo, JP;
Shinichi Nakajima, Tokyo, JP;
Yoshiyuki Asano, Tokyo, JP;
Tsuyoshi Yakihara, Tokyo, JP;
Akira Miura, Tokyo, JP;
Yokogawa Electric Corporation, Tokyo, JP;
Abstract
A light signal switching apparatus has an input port and output ports, and outputs an output light from a desired output port. The apparatus has a splitter polarizing an input light into first and second polarized light whose polarization planes are different mutually by 90 degrees, a first polarization controller rotating a polarization plane of the second polarized light by 90 degrees to output a third polarized light, a first optical switch switching a path of the first polarized light to the desired output port side, a second optical switch switching a path of the third polarized light to the desired output port side, a second polarization controller rotating a polarization plane of the first polarized light by 90 degrees to output a fourth polarized light, and a combiner combining the third polarized light with the fourth polarized light, to output a combined light to the desired output port.