Patent ID: 8547631
Filing Date: 2013-10-01
Classification: H01S

Abstract:
1. A semiconductor optical amplifier, comprising: an active wave guiding layer which comprises a passive core region that is formed of a semiconductor, and active cladding regions that each comprise an active layer which is formed of a semiconductor and which has an index of refraction to be lower than an index of refraction of said passive core region, wherein said passive core region is intercalated between two cladding layers of a passive region to form a slab structure of three layers that forms the passive region, wherein the two cladding layers of the passive region individually have indexes of refraction lower than the index of refraction of said passive core region, wherein said active cladding regions are each intercalated between two cladding layers of an active region to form a slab structure of three layers that forms the active region, wherein the two cladding layers of the active region individually have indexes of refraction lower than the indexes of refraction of each of said active cladding regions, wherein said active regions comprise a first active region and a second active region, and said active regions are oriented according to the first active region being adjacent to the passive region at a first end of the passive region and the second active region being adjacent to the second active region at a second end of the passive region, wherein both ends of said passive core region are connected with one end of one of said active cladding regions, wherein a light is wave guided and amplified in said active wave guiding layer, and wherein an intensity distribution of the light corresponding to a position in a layer direction of the active wave guiding layer at a central part in the direction of the face on the active wave guiding layer is not substantially distributed in the active cladding regions.