US 12,308,599 B2
Optical amplifier, optical amplifier equalizing method, and transmission system
Keiichi Matsumoto, Tokyo (JP); Emmanuel Le Taillandier De Gabory, Tokyo (JP); and Shigeyuki Yanagimachi, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 17/413,628
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Dec. 19, 2019, PCT No. PCT/JP2019/049875
§ 371(c)(1), (2) Date Jun. 14, 2021,
PCT Pub. No. WO2020/137820, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-243894 (JP), filed on Dec. 27, 2018.
Prior Publication US 2022/0045473 A1, Feb. 10, 2022
Int. Cl. H01S 3/067 (2006.01); H01S 3/091 (2006.01); H01S 3/094 (2006.01); H04B 10/294 (2013.01); H04J 14/00 (2006.01); H04J 14/02 (2006.01)
CPC H01S 3/06737 (2013.01) [H01S 3/06754 (2013.01); H01S 3/0912 (2013.01); H01S 3/094007 (2013.01); H01S 3/094096 (2013.01); H04B 10/294 (2013.01); H04J 14/02216 (2023.08); H04J 14/052 (2023.08)] 20 Claims
OG exemplary drawing
 
1. An optical amplifier that amplifies wavelength multiplexed signal light, the optical amplifier comprising:
a multi-core optical fiber that includes a clad, and a first core and a second core being disposed in the clad and is doped with rare-earth ions;
a pumping light source that supplies pumping light to the clad of the multi-core optical fiber; and
a wavelength demultiplexing unit that separates a plurality of wavelength bands of the wavelength multiplexed signal light propagating through the first core, wherein
signal light of a relatively long wavelength band among the plurality of wavelength bands separated by the wavelength demultiplexing unit is caused to propagate through the second core and multiplexed with signal light of a relatively short wavelength band among the plurality of wavelength bands separated by the wavelength demultiplexing unit, and the resultant multiplexed signal light is output.