Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2008-03-18
2008-03-18
Chan, Jason (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S157000, C398S104000, C398S042000, C359S334000, C359S337120, C359S341200, C359S341300, C359S341330
Reexamination Certificate
active
07346280
ABSTRACT:
A bi-directional configuration is employed to implement a hybrid ultra long haul (ULH)/long haul (LH) optical transmission system. The link carries ULH channels and LH channels in opposite directions in different bands. Raman amplification is employed for the ULH band while Erbium-doped fiber amplification (EDFA) is used for both the LH and ULH bands. Optical circulators are employed for multiplexing and demultiplexing. This solution does not incur the ripple penalty of prior art solutions based on interferential filters while providing excellent isolation between the ULH and LH channels and bi-directional communication within a single fiber.
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Mazzini Marco
Rodriguez Fransisco Martinez
Sguazzotti Alessandro
Aka Chan LLP
Chan Jason
Cisco Technology Inc.
Leung Wai Lun
LandOfFree
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