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. 14, 2014
Filed:
Jan. 06, 2011
Applicants:
Hideharu Mikami, Kawasaki, JP;
Taichi Kogure, Kamakura, JP;
Inventors:
Hideharu Mikami, Kawasaki, JP;
Taichi Kogure, Kamakura, JP;
Assignee:
Oclaro Japan, Inc., Kanagawa, JP;
Primary Examiner:
Int. Cl.
CPC ...
H04B 10/06 (2006.01); G02B 26/00 (2006.01); G02F 1/01 (2006.01); G02F 2/00 (2006.01); G02F 1/061 (2006.01);
U.S. Cl.
CPC ...
G02B 26/00 (2013.01); G02F 1/01 (2013.01); G02F 2/00 (2013.01); G02F 1/061 (2013.01);
Abstract
When designing a demodulator for a DPSK-modulated signal, it is required that optical phase modulation is performed fast and the demodulator has a long lifetime. To achieve this object, a delay line interferometer inside the demodulator performs adjustment of phase difference between two split lights caused to interfere, using a first optical phase modulation unit such as a Piezo actuator and a second optical phase modulation unit such as a heating element that operates slower in modulation speed than the first optical phase modulation unit and is slower in deterioration speed.