Optical: systems and elements – Optical amplifier – Optical fiber
Reexamination Certificate
2005-04-26
2005-04-26
Tarcza, Thomas H. (Department: 3663)
Optical: systems and elements
Optical amplifier
Optical fiber
Reexamination Certificate
active
06885500
ABSTRACT:
A method and apparatus is provided for controlling the optical output power from an optical amplifier arrangement. The arrangement includes a rare-earth doped fiber for imparting gain to an optical input signal propagating therethrough, a pump source for supplying pump power to the rare-earth doped fiber, and a tap for receiving a portion of the output power generated by the rare-earth doped fiber and converting it to a control signal. A controller is also provided for receiving the control signal and generating a bias current in response thereto for driving the pump source. The method begins by receiving an optical input signal that is being amplitude modulated at a prescribed frequency. The slew rate of the controller is adjusted so that the bias current drives the pump source to generate pump power that cannot vary at a rate greater than a slew-rate limit established by the controller. In this way resonance between the input signal and the frequency of the feedback control loop can be avoided.
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Ciaffa David
Converse Eric James
Donaldson Charles John
General Instrument Corporatin
Hughes Deandra M.
Mayer Fortkort & Williams PC
Mayer, Esq. Stuart H.
Tarcza Thomas H.
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