Semiconductor optical device, fiber optical amplifier and optica

Details Semiconductor optical device, fiber optical amplifier and optica Semiconductor optical device, fiber optical amplifier and optica

1997-08-28

2000-08-29

Bovernick, Rodney

Optical waveguides

With optical coupler

Particular coupling function

385 28, 385129, G02B 626

Patent

active

061119989

ABSTRACT:
A semiconductor optical device, a fiber optical amplifier and an optical transmission system are disclosed. The semiconductor optical device is excellent in the stability of the coupling efficiency and the splitting ratio of a Y-branch. Both the fiber optical amplifier and the optical transmission system operate in a stable manner over a long period of time even if an optical waveguide is employed which is operative in a multi-mode in the transverse direction. The semiconductor optical device has an optical waveguide, a mode filter for transmitting therethrough light of a fundamental mode and blocking the propagation of light of a higher-order mode. The mode filter is provided in at least a part of the optical waveguide. The width of the mode filter is larger than that of the optical waveguide.

REFERENCES:
patent: 5379354 (1995-01-01), Jenkins
patent: 5410625 (1995-04-01), Jenkins et al.
patent: 5640474 (1997-06-01), Tayag

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