Turnable distributed feedback-laser
First Claim
1. A tunable distributive feedback of semiconductor material formed on a substrate which is doped for electrical conduction of a first conductivity type, comprising a strip-shaped sequence of semiconductor layers grown one upon another and comprising an active layer for generating emission, a tuning layer formed of a material which has a different energy band gap between the valency band and the conduction band from the material of said active layer, and a central layer doped for a conductivity type opposite to the conductivity type of said substrate and formed between said active layer and said tuning layer, comprising further a grating created by a boundary surface between two layer with different refractive indexes, and lateral regions joining said strip-shaped layer sequence laterally and being doped for the same conductivity type as said central layer and having lateral dimensions so as to provide efficient lateral limitation of the current path.
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Abstract
A tunable distributed feedback laser which has an active region and a tuning region which are arranged transversely relative to each other and which can be separately driven in common via a central layer 4.
19 Citations
20 Claims
- 1. A tunable distributive feedback of semiconductor material formed on a substrate which is doped for electrical conduction of a first conductivity type, comprising a strip-shaped sequence of semiconductor layers grown one upon another and comprising an active layer for generating emission, a tuning layer formed of a material which has a different energy band gap between the valency band and the conduction band from the material of said active layer, and a central layer doped for a conductivity type opposite to the conductivity type of said substrate and formed between said active layer and said tuning layer, comprising further a grating created by a boundary surface between two layer with different refractive indexes, and lateral regions joining said strip-shaped layer sequence laterally and being doped for the same conductivity type as said central layer and having lateral dimensions so as to provide efficient lateral limitation of the current path.
Specification