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:
Oct. 31, 2017
Filed:
Jun. 01, 2016
Oclaro Japan, Inc., Kanagawa, JP;
Atsushi Nakamura, Nagano, JP;
Shunya Yamauchi, Kanagawa, JP;
Yoriyoshi Yamaguchi, Kanagawa, JP;
Noriko Sasada, Kanagawa, JP;
Nozomu Yasuhara, Kanagawa, JP;
Takayoshi Fukui, Kanagawa, JP;
Hiroki Irie, Kanagawa, JP;
OCLARO JAPAN, INC., Kanagawa, JP;
Abstract
Multilevel optical intensity modulation high in accuracy is performed using electro-absorption optical modulators. There is provided a plurality of EA modulators connected in series in a path of an optical signal from a light source, and a multilevel-coded modulated optical signal is generated by modulating an intensity of an input optical signal from the light source based on a modulation signal using the EA modulators. Each of the EA modulators is switched between an ON state and an OFF state of optical absorption in accordance with the modulation signal. Regarding an extinction ratio of the ON state to the OFF state in each of the EA modulators, the EA modulators have respective values difference from each other, and are arranged in ascending order of the extinction ratio from the light source side.