Optical communication system and optical communication...

Details Optical communication system and optical communication... Optical communication system and optical communication...

2006-02-14

2006-02-14

Healy, Brian M. (Department: 2883)

Optical waveguides

With optical coupler

Particular coupling function

C385S011000, C385S123000, C398S065000, C398S081000

Reexamination Certificate

active

06999655

ABSTRACT:
The present invention has an object to provide an optical communication system which keeps the confidentiality of information at the optical level to ensure the high safety. To this end, the optical communication system according to the present invention comprises: a PMD providing apparatus that gives the polarization-mode dispersion (PMD) which is changed in accordance with a variable pattern previously determined between an optical sender and an optical receiver to an optical signal output from the optical sender; to send the optical signal to an optical line network; and a PMD restoring apparatus that gives the PMD negating the PMD provided by the PMD providing apparatus to the optical signal propagated through the optical line network and restores the optical signal to the state at the transmission time, to send it to the optical receiver.

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International Search Report for Application PCT/JP03/00173 mailed Apr. 15, 2003.

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