US 7,072,372 B2 · Semiconductor laser device, semiconductor laser module, and optical fiber amplifier

Abstract

The present invention has a lower cladding layer, a lower SCH layer, a quantum well layer, an upper SCH layer, and a first upper cladding layer sequentially laminated on a substrate. A striped-pattern second upper cladding layer that has a longitudinal direction in a laser beam emission direction, and a current blocking layer are laminated on the first upper cladding layer. A third upper cladding layer and a contact layer are laminated sequentially on the second upper cladding layer and the current blocking layer respectively. The current blocking layer has a conduction type different from that of the second upper cladding layer. An effective index of an area that includes the current blocking layer is lower than the same of an area that includes the upper cladding layer.

Claims11

Dependent claims

A semiconductor laser device, comprising:

a lower cladding layer and an upper cladding layer laminated on an InP substrate;
an active layer laminated between the lower and upper cladding layers;
a current passing region formed in at least one of the lower cladding layer and the upper cladding layer, said current passing region having a striped pattern extending in an emission direction of a laser beam;
and
a current blocking region formed of GaxIn1−x,AsyP1−y (0<x≦1, 0<y≦1), said current blocking region being formed in at least one of the lower cladding layer and the upper cladding layer on both lateral sides of said current passing region, and having an opposite conductivity type to the at least one of the lower cladding layer and the upper cladding layer surrounding said current blocking region,
wherein the laser beam has a wavelength of not smaller than 1200 nm and not larger than 1600 nm, and an output of not smaller than 80 mW.

3 more elements

Dependencies are inferred from the claim text.

Semiconductor laser device, semiconductor laser module, and optical fiber amplifier

Life of this patent

Semiconductor laser device, semiconductor laser module, and optical fiber amplifier

Life of this patent

Abstract

Claims11