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:
Mar. 30, 2010
Filed:
Sep. 19, 2008
Akihiko Isomura, Machida, JP;
Jens Rasmussen, Kawasaki, JP;
Akihiko Isomura, Machida, JP;
Jens Rasmussen, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In the optical reception apparatus, a DQPSK polarization multiplexed signal light (S) input thereto is split into horizontally/vertically polarized signal lights (S, S) by a polarization beam splitter (), and the signal lights (S, S) each is branched into two by each of optical couplers (). Then, one branched lights (S, S) by each of the optical couplers () are supplied to a delay interferometer () on the I branch via optical circulators () to be propagated in bidirectional, and the other branched lights (S, S) by each of the optical couplers () are supplied to a delay interferometer () on the Q branch side via optical circulators () to be propagated in bidirectional, so that a set of delay interferometers () is commonly used for horizontally polarized waves and vertically polarized waves.