US 12,261,412 B2
Electro-absorption modulator
Hideaki Asakura, Kanagawa (JP); Atsushi Nakamura, Nagano (JP); Hayato Takita, Kanagawa (JP); and Shunya Yamauchi, Kanagawa (JP)
Assigned to Lumentum Japan, Inc., Kanagawa (JP)
Filed by Lumentum Japan, Inc., Kanagawa (JP)
Filed on Dec. 20, 2021, as Appl. No. 17/645,177.
Claims priority of application No. 2021-108430 (JP), filed on Jun. 30, 2021; and application No. 2021-145938 (JP), filed on Sep. 8, 2021.
Prior Publication US 2023/0006414 A1, Jan. 5, 2023
Int. Cl. H01S 5/026 (2006.01); G02F 1/015 (2006.01); G02F 1/017 (2006.01); G02F 1/025 (2006.01); H01S 5/227 (2006.01); H01S 5/343 (2006.01)
CPC H01S 5/0265 (2013.01) [G02F 1/0157 (2021.01); G02F 1/01708 (2013.01); G02F 1/025 (2013.01); H01S 5/227 (2013.01); H01S 5/343 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An electro-absorption modulator, comprising:
a substrate;
a mesa structure, which is provided on a first surface of the substrate, and includes a first conductivity type cladding layer, a multiple quantum well layer, and a second conductivity type cladding layer;
a first conductivity type electrode to be electrically connected to the first conductivity type cladding layer; and
a second conductivity type electrode provided on a second surface of the substrate, wherein:
the first conductivity type electrode includes a mesa-top electrode arranged along a direction in which the mesa structure extends, a pad electrode, to which an electric signal from an outside source is to be input, and a lead-out wire electrode, which connects the mesa-top electrode and the pad electrode,
the mesa structure has a light input end, to which light is to be input from outside, and a light output end, which is on a side of the mesa structure that is opposite of the light input end,
the mesa-top electrode has a first end closer to the light input end than the light output end and a second end closer to the light output end than the light input end,
a connection position between a center position in a short-side direction of the lead-out wire electrode and the mesa-top electrode is closer to the second end of the mesa-top electrode than the first end of the mesa-top electrode,
the connection position is a position that is less than 50% away from the second end of the mesa-top electrode with respect to a length in a long-side direction of the mesa-top electrode.