Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1997-07-03
1999-11-30
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359124, 359160, 359337, H04B 1012, H04J 1402, H01S 316
Patent
active
059952768
ABSTRACT:
Optical signals transmitted from optical transmission panels are received by photodetectors, which detect the number of actually transmitted optical signals. A control signal depending on the number of optical signals detected is supplied to an optical amplifier. The intensity of a combined optical signal amplified by the control signal is controlled by controlling a current supplied to a pumping light source. Information representative of the number of optical signals detected is superposed onto the amplified optical signal by generating the current supplied to the pumping light source as a sine-wave signal depending on the detected number of optical signals. In a downstream optical repeater, the information representative of the number of optical signals is extracted, and the optical signal is amplified, after which the information representative of the number of optical signals is superposed again onto the amplified optical signal for transmission. Even when some of the optical transmission panels fail to operate and the optical signals transmitted therefrom are interrupted, since the combined optical signal is amplified depending on the number of optical signals detected, the optical signals are maintained at a constant gain and output level.
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Chikuma Tadayuki
Tajima Tsutomu
Moskowitz Nelson
NEC Corporation
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