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. 30, 2010
Filed:
Nov. 29, 2006
Chang-soo Park, Seoul, KR;
Tae-young Kim, Seoul, KR;
Masanori Hanawa, Yamanashi, JP;
Sun-jong Kim, Gwangju, KR;
Swook Hann, Gwangju, KR;
Won-taek Han, Gwangju, KR;
Chang-Soo Park, Seoul, KR;
Tae-Young Kim, Seoul, KR;
Masanori Hanawa, Yamanashi, JP;
Sun-Jong Kim, Gwangju, KR;
Swook Hann, Gwangju, KR;
Won-Taek Han, Gwangju, KR;
Gwangju Institute of Science & Technology, Gwangju, KR;
Abstract
An optical DPSK signal demodulator includes a signal separator that separates an optical signal into an input optical signal and an output optical signal in a signal optical path. First and second reflectors are provided at a predetermined interval and reflect the optical signals with a predetermined time delay to have substantially the same intensity. A phase shifter is provided between the first and second reflectors and configured to allow the optical signals reflected from the first and second reflectors to have a phase difference.