Optical: systems and elements – Optical amplifier – Optical fiber
Reexamination Certificate
2006-12-05
2006-12-05
Hughes, Deandra M. (Department: 3663)
Optical: systems and elements
Optical amplifier
Optical fiber
C359S334000
Reexamination Certificate
active
07145718
ABSTRACT:
In one of control methods of a bidirectional pumping type Raman amplifier according to the present invention, the power of a pumping light supplied to a rare-earth element doped optical fiber is increased or decreased, and a transmission wavelength characteristic of a dynamic gain equalizer is controlled according to a change in a gain wavelength characteristic occurring due to the increase or decrease of the power of the pumping light, to thereby extend a signal light band to either a short wavelength side or a long wavelength side. As a result, it becomes possible to realize a signal light band extension service at a low cost. Moreover, in another control method of the present invention, in a condition where the supply of backward pumping light to the transmission path fiber is shut off, a ratio of a change in the output power of the signal light to a change in the power of the forward pumping light is obtained, and the forward pumping light power is optimized in accordance with this ratio, to obtain a desired level diagram irrespective of a lump loss on the transmission path fiber.
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Hayashi Etsuko
Muro Shinichirou
Sugaya Yasushi
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