Bi-directional optical add/drop multiplexer for WDM optical...

Details Bi-directional optical add/drop multiplexer for WDM optical... Bi-directional optical add/drop multiplexer for WDM optical...

2007-10-02

2007-10-02

Tran, Dzung (Department: 2613)

Optical communications

Multiplex

Wavelength division or frequency division

C398S045000, C398S046000, C398S082000

Reexamination Certificate

active

10754030

ABSTRACT:
Disclosed is a bi-directional optical add/drop multiplexer connected to an optical fiber for transmitting optical signals multiplexed in a wavelength division multiplexing optical network and which performs adding/dropping of the optical signals. The optical add/drop multiplexer includes a first wavelength division multiplexer provided with a multiplexing port functioning as a path for forward or backward optical signals and with a plurality of demultiplexing ports, each functioning as a path of demultiplexed channels. A plurality of add/drop parts, each performing adding/dropping of preset channels, and connected with the demultiplexing ports of the first wavelength division multiplexer in one-to-one. A second wavelength division multiplexer connected with the plurality of add/drop parts in one-to-one, provided with a plurality of demultiplexing ports, each functioning as a path for demultiplexed channels and with a multiplexing port functioning as a path for forward or backward optical signals. The first wavelength division multiplexer has a free spectral range equal to that of the second wavelength division multiplexer, in which a wavelength band of the forward optical signals is included in the free spectral range having one period, while a wavelength band of the backward optical signals is included in the free spectral range having another period.

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patent: 6999653 (2006-02-01), Lee et al.
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patent: 2002/0122440 (2002-09-01), Doerr
patent: 1316659 (2001-10-01), None
patent: 1318925 (2001-10-01), None

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