US 12,218,480 B2
Semiconductor optical amplifier integrated laser
Atsushi Nakamura, Nagano (JP); Kaoru Okamoto, Kanagawa (JP); Masatoshi Arasawa, Shinagawa-ku (JP); Tetsuya Nishida, Nakano-ku (JP); Yasushi Sakuma, Tokyo (JP); Shigetaka Hamada, Sagamihara (JP); and Ryosuke Nakajima, Sagamihara (JP)
Assigned to Lumentum Japan, Inc., Kanagawa (JP)
Filed by Lumentum Japan, Inc., Sagamihara (JP)
Filed on Jan. 9, 2023, as Appl. No. 18/151,577.
Application 18/151,577 is a continuation of application No. 16/901,872, filed on Jun. 15, 2020, granted, now 11,552,448.
Claims priority of application No. 2020-011661 (JP), filed on Jan. 28, 2020; and application No. 2020-080669 (JP), filed on Apr. 30, 2020.
Prior Publication US 2023/0155348 A1, May 18, 2023
Int. Cl. H01S 5/026 (2006.01); H01S 5/10 (2021.01); H01S 5/12 (2021.01); H01S 5/227 (2006.01); H01S 5/32 (2006.01); H01S 5/50 (2006.01); H01S 5/028 (2006.01)
CPC H01S 5/026 (2013.01) [H01S 5/0265 (2013.01); H01S 5/12 (2013.01); H01S 5/1215 (2013.01); H01S 5/1221 (2013.01); H01S 5/227 (2013.01); H01S 5/3211 (2013.01); H01S 5/50 (2013.01); H01S 5/0287 (2013.01); H01S 5/1064 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A semiconductor optical amplifier integrated laser comprising:
a substrate;
a cladding layer formed above the substrate;
an active layer formed between the substrate and the cladding layer; and
a common functional layer formed in the cladding layer and separated from the active layer,
wherein the semiconductor optical amplifier integrated laser includes a first domain and a second domain optically connected to the first domain,
wherein the second domain amplifies light from the first domain,
wherein the common functional layer includes a first portion that reflects light having a specific wavelength within a gain band of the active layer in the first domain and a second portion that transmits light having the specific wavelength within the gain band of the active layer in the second domain,
wherein the first domain includes a first grating structure, and
wherein the second domain includes a second grating structure at irregular intervals.