Optical device
First Claim
1. An optical element comprising a substrate formed of a material having an electrooptic effect, a top optical waveguide formed on a top face of said substrate, a bottom optical waveguide formed on a bottom face of said substrate, a top modulating electrode for controlling a phase of a light wave being propagated through said top optical waveguide, and a bottom modulating electrode for controlling a phase of a light wave being propagated through said bottom optical waveguide, wherein at least one side edge of said substrate comprises output and input of said optical waveguides formed on said top and bottom faces, and a turnback element is located adjacent to said one side edge to guide the light wave from said output to said input.
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Abstract
The present invention provides a highly-integrated and compact optical element and further provides an optical element having various functions such as lower driving voltage, chirping suppression and polarization-independency.
The optical element comprising a substrate 1 consisting of a material having an electrooptic effect, top optical waveguides 2-1 an 2-2 formed on the top face of said substrate, bottom optical waveguides formed on the bottom face of said substrate, a top modulating electrode for controlling the phase of a light wave being propagated through said top optical waveguide, and a bottom modulating electrode for controlling the phase of a light wave being propagated through said bottom optical waveguide, is characterized in that at least one side edge of said substrate comprises output and input of said optical waveguides formed on said top and bottom faces, and a turnback element is located adjacent to said one side edge to guide the light wave from said output to said input.
22 Citations
17 Claims
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1. An optical element comprising
a substrate formed of a material having an electrooptic effect, a top optical waveguide formed on a top face of said substrate, a bottom optical waveguide formed on a bottom face of said substrate, a top modulating electrode for controlling a phase of a light wave being propagated through said top optical waveguide, and a bottom modulating electrode for controlling a phase of a light wave being propagated through said bottom optical waveguide, wherein at least one side edge of said substrate comprises output and input of said optical waveguides formed on said top and bottom faces, and a turnback element is located adjacent to said one side edge to guide the light wave from said output to said input.
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9. An optical element comprising
a substrate formed of a material having an electrooptic effect, a plurality of optical waveguides formed on said substrate, and a modulating electrode for applying electric field into said optical waveguides, wherein said modulating electrode comprises at least two branching and confluence lines on a same line for applying a same modulating signal into different optical waveguides.
Specification