Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1995-02-28
1995-11-14
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359174, 359345, 372 70, G02B 626, G02F 139, H04B 1000, H01S 310
Patent
active
054672198
ABSTRACT:
A control circuit for reducing the output of an optical amplifier when reflected light associated with the output of the amplifier temporarily increases. An erbium-added optical fiber amplifies an input optical signal. Two optical detectors respectively detect the amplified optical signal and the reflected light. When a reflected light monitor signal does not exceed the level of a threshold signal, an output control circuit controls the intensity of an exciting light source in accordance with the an output light monitor signal. However, when the former exceeds the latter, the output control circuit reduces the output power of the optical signal. At this instant, the threshold level is lowered. As soon as the reflected light monitor signal becomes lower than the lowered threshold, an inverting amplifier causes the monitor signal to be restored to the original level.
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Okamara et al, IEEE Journ. of Solid-State Circuits; vol. 27, No. 12, Dec. 1992, pp. 1775-1780, Abstract Only Renewed & Copy of Abstract Herewith.
Moskowitz Nelson
NEC Corporation
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