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. 24, 2015
Filed:
Feb. 14, 2013
Applicant:
Sumitomo Electric Industries, Ltd., Osaka-shi, Osaka, JP;
Inventor:
Shingo Yamanaka, Yokohama, JP;
Assignee:
SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B 10/08 (2006.01); H04B 17/00 (2015.01); H04B 10/04 (2006.01); H04B 10/12 (2006.01); H04B 10/548 (2013.01); H04B 10/50 (2013.01); H04B 10/556 (2013.01);
U.S. Cl.
CPC ...
H04B 10/548 (2013.01); H04B 10/5053 (2013.01); H04B 10/5561 (2013.01);
Abstract
An optical transmitter implemented with two QPSK (Quadrature Phase Shift Keying) modulators is disclosed. Each of the QPSK modulators provides a waveguide made of semiconductor material inducing the QCSE (Quantum Confined Stark Effect) by a bias supplied thereto. The optical performance of one of the QPSK modulators is determined by supplying a deep bias to the other of the QPSK modulator to eliminate the optical output therefrom.