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:
Jul. 19, 2016
Filed:
Sep. 17, 2014
Sumitomo Electric Industries, Ltd., Osaka, JP;
National Institute of Advanced Industrial Science and Technology, Tokyo, JP;
Katsumi Uesaka, Yokohama, JP;
Eiichi Banno, Yokohama, JP;
Hajime Shoji, Yokohama, JP;
Hiroyuki Matsuura, Tsukuba, JP;
Haruhiko Kuwatsuka, Tsukuba, JP;
Ken Tanizawa, Tsukuba, JP;
Shu Namiki, Tsukuba, JP;
Sumitomo Electric Industries, Ltd., Osaka-shi, JP;
National Institute of Advanced Industrial Science and Technology, Tokyo, JP;
Abstract
A system includes: a splitter to branch an optical signal output by a wavelength-tunable light source into first to third optical signals; a first photodiode to perform an optical electrical conversion of the first optical signal transmitting a first etalon; a second photodiode to perform an optical electrical conversion of the second optical signal transmitting a second etalon, an FSR of the second etalon being identical to that of the first etalon, peak wavelengths of intensity of a transmitted light of the second etalon being different from those of the first etalon; a third photodiode to perform an optical electrical conversion of the third optical signal; and a controller to control the wavelength-tunable light source with use of a coefficient calculated by following formulas (1) or (2), Coefficient=(PD1−A·PD3)/(PD2−B·PD3) (1) and Coefficient=(PD2−B·PD3)/(PD1−A·PD3) (2).