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:
Dec. 07, 2010
Filed:
May. 03, 2007
Yasuyuki Suzuki, Musashino, JP;
Yoshihiro Sanpei, Musashino, JP;
Morio Wada, Musashino, JP;
Hiroyuki Matsuura, Musashino, JP;
Akira Miura, Musashino, JP;
Yasuyuki Suzuki, Musashino, JP;
Yoshihiro Sanpei, Musashino, JP;
Morio Wada, Musashino, JP;
Hiroyuki Matsuura, Musashino, JP;
Akira Miura, Musashino, JP;
Yokogawa Electric Corporation, Tokyo, JP;
Abstract
A delay interferometer and a demodulator including the delay interferometer and a balanced photodetector are provided. A half mirror splits an optical signal into first and second split beams of light which travel on first and second optical paths, respectively. A first reflector being disposed on the first optical path reflects the first split beam of light toward the half mirror. The second reflector being disposed on the second optical path reflects the second split beam of light toward the half mirror. At least one phase compensator being disposed between the half mirror and at least one of the first and second reflectors includes a medium that exhibits thermooptic effect and has temperature dependency of refractive index. The half mirror couples the first and second split beams of light to generate at least first and second coupled beams of light.