OPTICAL MODULATOR THAT INCLUDES OPTICAL WAVEGUIDE FORMED IN FERROELECTRIC SUBSTRATE

摘要

An optical modulator includes: a ferroelectric substrate in which an input optical waveguide, first and second optical waveguides, and an output optical waveguide are formed; a first electrode formed in a vicinity of the first optical waveguide and to which a first DC voltage is applied; a second electrode formed in a vicinity of the second optical waveguide and to which a second DC voltage is applied; a third electrode electrically connected to the first electrode and formed on both sides of the second electrode; and a fourth electrode electrically connected to the second electrode and formed on both sides of the first electrode. A first gap between the first electrode and the fourth electrode is approximately the same as a second gap between the second electrode and the third electrode. A gap between the third electrode and the fourth electrode is 1-5 times greater than the first gap.

主权项

1. An optical modulator comprising:
a ferroelectric substrate in which an input optical waveguide, first and second optical waveguides that are optically coupled to the input optical waveguide, and an output optical waveguide that is optically coupled to the first and second optical waveguides are formed; a signal electrode that is formed in a vicinity of at least one of the first optical waveguide and the second optical waveguide; a first electrode that is formed in a vicinity of the first optical waveguide and to which a first DC voltage is applied; a second electrode that is formed in a vicinity of the second optical waveguide and to which a second DC voltage is applied; a third electrode that is electrically connected to the first electrode and formed on both sides of the second electrode; and a fourth electrode that is electrically connected to the second electrode and formed on both sides of the first electrode, wherein, a first gap between the first electrode and the fourth electrode is the same or approximately the same as a second gap between the second electrode and the third electrode, and a gap between the third electrode and the fourth electrode is 1-5 times greater than the first gap.