Raman amplifying device and method for pump modulation

Optical: systems and elements – Optical amplifier – Raman or brillouin process

Reexamination Certificate

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C359S337000

Reexamination Certificate

active

07116470

ABSTRACT:
The invention is dealing with a Raman amplifying device comprising an optical path, pump sources for generating a plurality of Raman pump signals and means for coupling the plurality of Raman pump signals into the optical path for backward pumping. The plurality of optical Raman pump signals are time-division multiplexed by multiplexing controlling means and the controlling means apply a modulation frequency beyond the corner frequency of the co-propagating modulation transfer function. The method to modulate the time division multiplexed Raman signal gives a condition to avoid the increase of double Rayleigh scattering noise.

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