Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2007-12-25
2007-12-25
Keith, Jack (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
C398S012000, C398S026000
Reexamination Certificate
active
11138492
ABSTRACT:
An optical transmission system wherein a main signal light is amplified by Raman amplification, and noise light (ASS light) produced by the Raman amplification can be corrected with a simple configuration and with high accuracy. The optical transmission system includes, in each transmission section: a cutoff section for transmitting/cutting off a main signal light outputted from the optical transmitter on the preceding stage and inputted into the Raman amplification medium on an optical transmission line; a control section for varying the power of the pumping light supplied to the Raman amplification medium and changing the state of the cutoff section depending on the variation of the pumping light power; a monitor section for measuring the power of the pumping light supplied to the Raman amplification medium and the power of the light propagated through the optical transmission line and inputted into an optical transmitter on the succeeding stage; and a processing section for separately detecting the power of the main signal light and the power of the ASS light on the basis of the results of the measurement by the monitor section, and correcting the ASS light.
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Ishikawa Eiji
Otani Toshihiro
Bolda Eric
Keith Jack
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