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US 2001/0036338 A1Published application
Optical transmission module and optical communication system using the same
AssigneeHitachi, Ltd.
InventorsNaoki Matsushima, Kazumi Kawamoto
Life of this patent
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Abstract
A beam spot size enlarger waveguide for enlarging the beam spot size is connected to a beam spot size reducer waveguide for shrinking the beam spot size, along with the direction of the propagation of light beam; or the beam spot size enlarger waveguide, a beam spot size maintainer waveguide for maintaining the beam spot size constantly, and the beam spot size reducer waveguide are connected in the direction of the propagation of light beam.
Claims8
An optical module, comprising:
- a first optical waveguide for enlarging the spot size of light beam in the direction of propagation of the beam;
- and
- a second optical waveguide for shrinking the spot size of light beam enlarged by said first waveguide in the direction of beam propagation.
An optical module, comprising:
- a first optical waveguide for enlarging the spot size of an optical beam in the direction of propagation of the beam;
- a second optical waveguide for maintaining the spot size of optical beam enlarged by said first optical waveguide;
- and
- a third optical waveguide for shrinking the spot size of optical beam maintained by said second optical waveguide.
1 more element
Dependencies are inferred from the claim text.