Bi-directional long haul/ultra long haul optical...

Optical communications – Multiplex – Wavelength division or frequency division

Reexamination Certificate

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C398S157000, C398S104000, C398S042000, C359S334000, C359S337120, C359S341200, C359S341300, C359S341330

Reexamination Certificate

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10099488

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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“Combination of Raman and Erbium Amplifiers Provides Better System Performance”, Understanding Optical Networking, Telecommunications Research Associates, 2002.

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