A laser structure includes at least one active layer having doped Ge so as to produce light emissions at approximately 1550 nm from the direct band gap of Ge. A first confinement structure is positioned on a top region of the at least one active layer. A second confinement structure is positioned on a bottom region the at least one active layer.

 
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< Laser optical apparatus

> Semiconductor laser diode

> Semiconductor device having fuse element arranged between electrodes formed in different wiring layers

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