Optical communications – Receiver – Including postcompensation
Reexamination Certificate
2011-08-02
2011-08-02
Bello, Agustin (Department: 2613)
Optical communications
Receiver
Including postcompensation
C398S205000, C398S212000
Reexamination Certificate
active
07991301
ABSTRACT:
An optical apparatus comprising: a branching unit branching an input light modulated by DQSPK format and thereby outputting a first branched light and a second branched light; a first branch and a second branch inputting the first branched light and the second branched light, respectively, the first branch and the second branch having an interferometer, a photo detector, and discriminator and demodulating I-signal and Q-signal, respectively; and an abnormality detection unit detecting an abnormality of the input light based on a synchronized detection of a first demodulated signal output from the photo detector in the first branch and a first recovered signal output from the discriminator in the first branch, and a synchronized detection of a second demodulated signal output from the photo detector in the second branch and a second recovered signal output from the discriminator in the second branch.
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Kaburagi Kenichi
Mizuguchi Noriaki
Terayama Yoshikazu
Toyomaki Takashi
Bello Agustin
Fujitsu Limited
Staas & Halsey , LLP
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