Patent
Optical functional device and optical module
Shuichi Nagai
- 21 Nov 2003
26
TL;DR: In this article, a connection between two optical waveguides along an optical axis is constructed by selectively enlarging the width of the second optical waveguide and allowing it to function as a multimode interference waveguide.
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Abstract: An inventive optical functional device includes: two optical waveguides having mutually different equivalent refractive indices; and a connection through which the two optical waveguides are connected along an optical axis. The two optical waveguides are provided as a first optical waveguide, and a second optical waveguide having an equivalent refractive index lower than that of the first optical waveguide, respectively. The connection, through which the first and second optical waveguides are connected along the optical axis, is formed by selectively enlarging the width of the second optical waveguide, and is allowed to function as a multimode interference waveguide. The connection allows multimode propagation of a light passing through the second optical waveguide, and allows the light to be coupled into the first optical waveguide.
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Citations
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Directional semiconductor waveguide coupler
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TL;DR: A waveguide mode expander couples a smaller optical mode in a semiconductor waveguide to a larger optical modes in an optical fiber as discussed by the authors, which comprises a shoulder and a ridge.
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- 23 Feb 2016
TL;DR: In this article, a method of fabricating a waveguide mode expander is described, where the first optical material layer supports an input mode substantially the same size as a mode exiting the waveguide, and the overlying layers, when combined with the first layer, support a larger, output optical mode size.
10
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