4. Optical communications
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DQPSK optical receiver circuit

Optical communications – Receiver
Reexamination Certificate

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DQPSK receiver phase control

Optical communications – Receiver – Heterodyne
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DQPSK transmitter with parallel precoder and high-speed...

Optical communications – Transmitter – Having particular modulation
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DQPSK/DPSK optical receiver with tunable optical fibers

Optical communications – Receiver
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Drive control apparatus and drive control method for optical...

Optical communications – Transmitter – Including compensation
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Drive method for a plurality of acousto-optic filters,...

Optical communications – Multiplex – Wavelength division or frequency division
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Driver circuit and optical-transmission module

Optical communications – Transmitter – Having particular modulation
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Driver for an optical transmitter

Optical communications – Transmitter – Including compensation
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Driving apparatus of a light-emitting device

Optical communications – Transmitter – Having particular modulation
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Drop-and-continue device

Optical communications – Multiplex – Wavelength division or frequency division
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DSB-SC modulation system capable of erasing carrier and...

Optical communications – Transmitter – Having particular modulation
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Dual band wireless communication having high availability...

Optical communications – Hybrid communication system
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Dual band wireless communication having high availability...

Optical communications – Hybrid communication system
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Dual homing for DWDM networks in fiber rings

Optical communications – Multiplex – Broadcast and distribution system
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Dual-mode fiber optic telecommunications system and method

Optical communications – Transmitter – Having particular modulation
Reexamination Certificate

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Dual-wave optical shared protection ring

Optical communications – Fault recovery – Wdm
Reexamination Certificate

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Duobinary optical transmission apparatus

Optical communications – Transmitter – Having particular modulation
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Duobinary optical transmission apparatus

Optical communications – Transmitter – Having particular modulation
Reexamination Certificate

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Duobinary optical transmission apparatus using a...

Optical communications – Transmitter – Having particular modulation
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Duobinary optical transmitter

Optical communications – Transmitter – Having particular modulation
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