US 12,439,187 B2
Optical branching/coupling device and method for controlling same
Ryu Kurahashi, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 18/025,781
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Aug. 20, 2021, PCT No. PCT/JP2021/030527
§ 371(c)(1), (2) Date Mar. 10, 2023,
PCT Pub. No. WO2022/064913, PCT Pub. Date Mar. 31, 2022.
Claims priority of application No. 2020-159231 (JP), filed on Sep. 24, 2020.
Prior Publication US 2023/0353912 A1, Nov. 2, 2023
Int. Cl. H04Q 11/00 (2006.01); H04J 14/02 (2006.01)
CPC H04Q 11/0062 (2013.01) [H04J 14/02 (2013.01); H04Q 11/0005 (2013.01); H04Q 2011/0016 (2013.01); H04Q 2011/0081 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An optical branching/coupling device comprising:
first, second and third optical transmission paths, each configured to input and output a wavelength-multiplexed optical signal;
a first multiplexing/demultiplexing circuit configured to output, based on wavelength-multiplexed optical signals input from the second and third optical transmission paths, a first optical signal to be output from the first optical transmission path, output, based on wavelength-multiplexed optical signals input from the first and third optical transmission paths, a second optical signal to be output from the second optical transmission path, and output, based on wavelength-multiplexed optical signals input from the first and second optical transmission paths, a third optical signal to be output from the third optical transmission path;
a second multiplexing/demultiplexing circuit configured to output, based on wavelength-multiplexed optical signals input from the first, second and third optical transmission paths, any one of the first, second and third optical signals;
an optical branching circuit configured to distribute wavelength-multiplexed optical signals being input from the first, second and third optical transmission paths to the first and second multiplexing/demultiplexing circuits; and
an optical switch configured to select, based on each output destination, either of the first, second and third optical signals generated in the first multiplexing/demultiplexing circuit and the first, second and third optical signals generated in the second multiplexing/demultiplexing circuit, and output the selected optical signals to the output destination.