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US 10,855,052 B2Granted
Optical device
AssigneeMitsubishi Electric Corporation
InventorsYudai Imai, Norio Okada, Shinichi Kaneko
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Abstract
A semiconductor laser (1) emits laser light. An electro-absorption optical modulator (2) modulates the laser light. The electro-absorption optical modulator (2) includes a plurality of electro-absorption regions (2a, 2b, 2c) having different extinction characteristics, whereby the extinction ratio curve of the optical device can be controlled to have a shape with multiple steps that is suited to driving conditions.
Claims8
An optical device comprising:
- a semiconductor laser emitting laser light;
- and
- an electro-absorption optical modulator modulating the laser light, wherein
- the electro-absorption optical modulator includes a plurality of electro-absorption regions having different extinction characteristics,
- each of the plurality of electro-absorption regions includes a light absorption layer and an undoped layer provided on the light absorption layer, and
- thicknesses of the undoped layers of the plurality of electro-absorption regions are different from each other.
3 more elements
Dependencies are inferred from the claim text.