Optical communications – Multiplex – Broadcast and distribution system
Reexamination Certificate
2005-04-26
2005-04-26
Ullah, Akm Enayet (Department: 2874)
Optical communications
Multiplex
Broadcast and distribution system
C398S048000, C398S082000, C385S024000, C385S037000
Reexamination Certificate
active
06885823
ABSTRACT:
An optical multiplexing/demultiplexing apparatus in which a plurality of optical multiplexing/demultiplexing units operating in different wavelength bands are connected hierarchically. Each of the plurality of optical multiplexing/demultiplexing units includes an input waveguide for receiving wavelength multiplexed optical waves, a filter for separating the wavelength multiplexed optical wave from the input waveguide into a first optical wave in a corresponding operating wavelength band and a second optical wave in the other wavelength bands. Each of the multiplexing/demultiplexing units also includes an AWG optical multiplexer/demultiplexer for separating the first optical wave from the filter into individual optical waves each of a single wavelength, and a branch waveguide for directing the second optical waves from the filter to an input waveguide of a succeeding optical multiplexing/demultiplexing unit.
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Izawa Tatsuo
Kato Kuniharu
Oguchi Taisuke
Yamada Yasufumi
NTT Electronics Corporation
Pillsbury & Winthrop LLP
Rahll Jerry T
Ullah Akm Enayet
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