Optical communications – Transmitter and receiver system – Including optical waveguide
Reexamination Certificate
2011-03-15
2011-03-15
Bello, Agustin (Department: 2613)
Optical communications
Transmitter and receiver system
Including optical waveguide
C398S140000, C380S255000, C380S256000, C380S278000, C380S273000
Reexamination Certificate
active
07907850
ABSTRACT:
An optical communication apparatus that can perform stable intensity and phase modulation on an optical pulse at high speed is provided, as well as a quantum key distribution system using the apparatus. Using multilevel signals for the electric signals (RF1, RF2) to be applied to two arms of a two-electrode Mach-Zehnder modulator, phase modulation is performed on an optical pulse in accordance with the average of the levels of the signals (RF1, RF2), and intensity modulation is performed on the optical pulse in accordance with the voltage difference between the signals (RF1, RF2), whereby stable high-speed multilevel modulation can be realized. The cryptographic key generation rate in a decoy quantum key distribution system is enhanced.
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Maeda Wakako
Tajima Akio
Takahashi Seigo
Tanaka Akihiro
Bello Agustin
NEC Corporation
Scully , Scott, Murphy & Presser, P.C.
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