Patent ID: 11942761
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Optics (Instruments)
Classification: CPC H | IPC H

Claim 18:
19. An optical semiconductor integrated element, comprising:
a laser diode section provided on a surface of a substrate;
a spot-size converter section provided on a surface of the substrate, said spot-size converter section being composed of: a core layer which causes laser light emitted from the laser diode section to propagate therein and whose both sides are tapered down in a propagation direction of the laser light to form a tapered shape; a front-surface side cladding layer which covers a front surface side of the core layer; a back-surface side cladding layer which covers a back surface side of the core layer; first cladding layers provided on the both sides of the core layer; and a second cladding layer provided on respective surfaces of the front-surface side cladding layer and the first cladding layers;
a window region provided on a surface of the substrate that is placed on a front-end side of the core layer of the spot-size converter section, said window region having a first window layer provided as a portion of that region corresponding to the first cladding layers and a second window layer provided as a portion of that region corresponding to the second cladding layer; and
a monitor section provided on a surface of the window region;
wherein a refractive index of the first window layer is lower than a refractive index of the second window layer.