Semiconductor optical amplification element
AssigneeNEC Corporation
InventorShotaro Kitamura
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Abstract
The invention provides a semiconductor optical amplification element which reduces noise light emission and increases saturation output power. The semiconductor optical amplification element has an optical waveguide which includes a core layer formed from an active layer acting as an optical amplification medium and amplifies and outputs an optical signal without electrically converting. The light reflection factor on an inputting side end of the element for the optical signal is lower than the light reflection factor on another outputting side end of the element.
Claims17
A semiconductor optical amplification element having an optical waveguide which includes a core layer formed from an active layer acting as an optical amplification medium and amplifies and outputs an optical signal without electrically converting the optical signal wherein a light reflection factor on an inputting side end of said element for an optical signal is lower than a light reflection factor on an outputting side end of said element, and further wherein said optical waveguide is a striped optical waveguide and is formed in an inclined relationship from a direction of a normal to an end facet of said element and besides has, in the proximity of the opposite ends of said element, window regions in which the optical waveguide structure is terminated, and the window region on the optical signal inputting side is longer by more than 20 .mu.m than the window region on the optical signal outputting side.
A semiconductor optical amplification element a having an optical waveguide which includes a core layer formed from an active layer acting as an optical amplification medium and amplifies and outputs an optical signal without electrically converting the optical signal wherein a light reflection factor on an inputting side end of said element for an optical signal is lower than a light reflection factor on an outputting side end of said element, and further comprising a window region, in which the optical waveguide structure is terminated, only in the proximity of the inputting side end of said element.
A semiconductor optical amplification element having an optical waveguide which includes a core layer formed from an active layer acting as an optical amplification medium and amplifies and outputs an optical signal without electrically converting the optical signal wherein a light reflection factor on an inputting side end of said element for an optical signal is lower than a light reflection factor on an outputting side end of said element, and further wherein said optical waveguide has a partial curved portion formed thereon such that an emitting direction of light by current injection light emission is inclined from a direction of a normal to an inputting side end facet of said element.
A semiconductor optical amplification element having an optical waveguide which includes a core layer formed from an active layer acting as an optical amplification medium and amplifies and outputs an optical signal without electrically converting the optical signal wherein a light reflection factor on an inputting side end of said element for an optical signal is lower than a light reflection factor on an outputting side end of said element, and further wherein said optical waveguide whose core layer is formed from an active layer is striped optical waveguide and passive optical waveguides are additionally provided for the opposite ends of said optical waveguide, and the passive optical waveguide on the optical signal inputting side has a partial curved portion formed thereon such that an emitting direction of light by current injection is inclined from a direction of a normal to an end facet of said element only on the optical signal inputting side.
A semiconductor amplification element having an optical waveguide which includes a core layer formed from an active layer acting as an optical amplification medium and amplifies and outputs an optical signal without electrically converting the optical signal wherein a light reflection factor on an inputting side end of said element for an optical signal is lower than a light reflection factor on an outputting side end of said element, and further wherein said optical waveguide whose core layer is formed from an active layer is a striped optical waveguide and passive optical waveguides are additionally provided for the opposite ends of said optical waveguide, and the passive optical waveguide on the optical signal inputting side has a partial curved portion formed thereon such that an emitting direction of light by current injection is inclined from a direction of a normal to each end facet of said element and the inclination on the optical signal inputting side is larger than that on the optical signal outputting side.
Dependencies are inferred from the claim text.