US 12,455,442 B2
Wavelength variable optical filter
Yurina Tanaka, Tokyo (JP); Yuichi Akage, Tokyo (JP); Masahiro Ueno, Tokyo (JP); Takashi Sakamoto, Tokyo (JP); Sohan Kawamura, Tokyo (JP); and Soichi Oka, Tokyo (JP)
Assigned to NTT, Inc., Tokyo (JP)
Appl. No. 17/919,959
Filed by NTT, Inc., Tokyo (JP)
PCT Filed Apr. 21, 2020, PCT No. PCT/JP2020/017176
§ 371(c)(1), (2) Date Oct. 19, 2022,
PCT Pub. No. WO2021/214865, PCT Pub. Date Oct. 28, 2021.
Prior Publication US 2023/0161149 A1, May 25, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 26/00 (2006.01)
CPC G02B 26/002 (2013.01) [G02B 26/001 (2013.01); G02B 26/007 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A wavelength variable optical filter comprising:
a first plate-like component made of a light transmissive material which has an electrostrictive effect, the first plate-like component including a first incident surface on a first side of the first plate-like component and a first emission surface on a second side of the first plate-like component, the first side of the first plate-like component being opposite to the second side of the first plate-like component;
a second plate-like component made of a light transmissive material, the second plate-like component including a second incident surface on a first side of the second plate-like component and a second emission surface on a second side of the second plate-like component, the first side of the second plate-like component being opposite to the second side of the second plate-like component;
a first reflective film on a side of the first emission surface and configured to partially reflect light transmitting through the first plate-like component;
a first transparent electrode on the first incident surface;
a second transparent electrode between the first emission surface and the first reflective film; and
a second reflective film on the second incident surface and configured to partially reflect light transmitting through the second plate-like component, wherein the first reflective film and the second reflective film provide a Fabry-Perot interferometer.