Optical waveguide element
First Claim
Patent Images
1. An optical waveguide element, comprising:
- as a core section, a rib waveguide including (i) a protruding section and (ii) two non-protruding sections shorter than the protruding section and so arranged in a first direction as to sandwich the protruding section,the core section having a first core region and a second core region overlapping with each other in a second direction, which is perpendicular to the first direction, and configured to form a PN junction,the optical waveguide element being configured to form, between the first core region and the second core region, a depletion layer extending from the protruding section to both of the two non-protruding sections,the depletion layer having a position in the second direction in each of the two non-protruding sections which position is lower than a position, in the second direction, of the depletion layer in the protruding section.
1 Assignment
0 Petitions
Accused Products
Abstract
To reduce the optical loss, lower the driving voltage, produce a smaller product, and simplify the production process, an embodiment of the present invention includes a rib waveguide core (101) having a rib region (101r) and two slab regions (101s), where a depletion layer (113) is so formed as to extend from the rib region (101r) to the two slab regions (101s).
-
Citations
11 Claims
-
1. An optical waveguide element, comprising:
-
as a core section, a rib waveguide including (i) a protruding section and (ii) two non-protruding sections shorter than the protruding section and so arranged in a first direction as to sandwich the protruding section, the core section having a first core region and a second core region overlapping with each other in a second direction, which is perpendicular to the first direction, and configured to form a PN junction, the optical waveguide element being configured to form, between the first core region and the second core region, a depletion layer extending from the protruding section to both of the two non-protruding sections, the depletion layer having a position in the second direction in each of the two non-protruding sections which position is lower than a position, in the second direction, of the depletion layer in the protruding section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11)
-
-
10. An optical waveguide element, comprising:
-
as a core section, a rib waveguide including (i) a protruding section and (ii) two non-protruding sections shorter than the protruding section and so arranged in a first direction as to sandwich the protruding section, the core section having a first core region and a second core region overlapping with each other in a second direction, which is perpendicular to the first direction, and configured to form a PN junction, the optical waveguide element being configured to form, between the first core region and the second core region, a depletion layer extending from the protruding section to at least one of the two non-protruding sections, in a case where the depletion layer overlaps with an electric field of guided light by a maximum area, (i) in the protruding section, the first core region having a lower surface with a height of hr/2−
hs/2 in the second direction (where hs is a thickness of at least one of the two non-protruding sections, and hr is a thickness of the protruding section) relative to a height of a lower surface of the core section, and(ii) in the protruding section, the second core region having an upper surface with a height of hr/2+hs/2 in the second direction relative to the height of the lower surface of the core section.
-
Specification