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AssigneeNippon Telegraph and Telephone Corporation
InventorsTakashi Go, Yuichiro Ikuma, Kenya Suzuki, Keita Yamaguchi, Ai Yanagihara
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An optical phase shifter in which a phase shift amount is kept constant in a wide wavelength region is provided. One aspect is the optical phase shifter constituting of two waveguides of a basic width, and configured so that two lights propagating through each waveguide have a phase difference, including a different type waveguide arranged in at least one of the two waveguides and having a waveguide width different from the basic width, and a configuration of the different type waveguide and a parameter of the two waveguides and different type waveguide are optimized.
An optical phase shifter constituting of two waveguides having a basic width W0 and configured such that two lights propagating through the respective waveguides have a phase difference ξ, the optical shifter comprising:
Dependencies are inferred from the claim text.