Gain-coupling type distributed feedback semiconductor laser and method for producing the same
AssigneeSharp Kabushiki Kaisha
InventorsKei Yamamoto, Hidenori Kawanishi
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Abstract
A gain-coupling type distributed feedback semiconductor laser device having a periodically varying gain along a cavity direction includes: a first periodic undulation formed along the cavity direction, the first periodic undulation including convex and concave portions; a semiconductor embedded layer formed on the first periodic undulation; and at least one active layer formed within the semiconductor embedded layer so as to extend along a direction which is perpendicular to the surface of a substrate, the at least one active layer being present on the concave portions of the first periodic undulation with a period which is substantially equal to a period of the first periodic undulation.
Claims15
A gain-coupling type distributed feedback semiconductor laser device having a periodically varying gain along a cavity direction, comprising:
- a first periodic undulation formed along the cavity direction, the first periodic undulation including convex and concave portions;
- a semiconductor embedded layer formed on the first periodic undulation;
- and
- at least one active layer formed within the semiconductor embedded layer so as to extend along a direction which is perpendicular to the surface of a substrate, the at least one active layer being present on the concave portions of the first periodic undulation with a period which is substantially equal to a period of the first periodic undulation.
A method for producing a gain-coupling type distributed feedback semiconductor laser device having a periodically varying gain along a cavity direction, comprising the steps of:
- forming a periodic undulation including convex and concave portions on a surface of a semiconductor;
- and
- forming a semiconductor embedded layer formed on the periodic undulation, the semiconductor embedded layer including periodically disposed active layers.
Dependencies are inferred from the claim text.