SUBSTRATE-TYPE WAVEGUIDE ELEMENT AND OPTICAL MODULATOR

摘要

Since a cross section of at least a partial segment of a first core has a step-like shape including a quadrilateral shape of a main part and a quadrilateral shape of a protruding part protruding from the main part, respective effective refractive indices of TE polarized waves in the first core and in the second core differ from each other.

主权项

1. A substrate-type waveguide element comprising:
a lower cladding; a first core and a second core which are provided on the lower cladding; and an upper cladding provided on the lower cladding so as to bury the first core and the second core, a TM polarized wave inputted into the first core being outputted from the second core, a cross section of at least a partial segment of the first core having a step-like shape including a quadrilateral shape of a main part and a quadrilateral shape of a protruding part protruding from the main part, so that an effective refractive index of a TE polarized wave in the first core differs from an effective refractive index of a TE polarized wave in the second core.