Optical: systems and elements – Optical amplifier – Particular active medium
Reexamination Certificate
2007-01-23
2007-01-23
Tarcza, Thomas H. (Department: 3663)
Optical: systems and elements
Optical amplifier
Particular active medium
Reexamination Certificate
active
10708219
ABSTRACT:
An active layer contains quantum structures. The active layer amplifies light propagating therein while current is injected therein. Electrodes are provided for sections of the active layer sectionalized along a light propagation direction. The electrodes inject different currents into the sections. Current is supplied to the electrodes in such a manner that a first current density is set to one section of the active layer and a second current density is set to another section. The first current density is lower than that at a cross point and the second current density is higher than that at the cross point. The cross point is a cross point between gain coefficient curves at least two different transition wavelengths of the quantum structures. The curves are drawn in a graph showing a relation between a density of current injected into the active layer and a gain coefficient of the active layer.
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Armstrong Kratz Quintos Hanson & Brooks, LLP
Diacou Ari M.
Fujitsu Limited
Tarcza Thomas H.
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